2012
- SUNOCO Race Fuels Modified Rules -
Updated February 29th, 2012
ANYTHING NOT COVERED BY THE FOLLOWING RULES MUST BE CHECKED WITH
SPENCER SPEEDWAY OFFICIALS BEFORE PROCEEDING. SPENCER SPEEDWAY
RESERVES THE RIGHT TO ADJUST ANY RULE FOR BETTER COMPETITION.
ALL DECISIONS ARE FINAL AND BINDING.
GENERAL:
1. WEIGHT
All cars minimum weight 2600 pounds with driver. Dry sump oil
systems are not permitted. Spencer Speedway Sunoco Weekly cars
with a compression ratio of less then 9.6 to 1 will be given a
weight break of 50lbs for a total weight of 2550. Maximum 56%
left side weight. Car with driver. NO allowances for gas, water,
oil. NO deduction for loss in weight due to race wears.
Dislodged weight CAN NOT be returned to car for weighing after
race. Absolutely NO weight shift devices of any type.
TRACK SCALE: Unless otherwise authorized by Spencer Speedway, at
all times during an event, all weights will be calculated on
official Spencer Speedway track scales. It is the responsibility
of each race team to see that their car meets the specified
minimum weight requirements for this division on these scales.
SPENCER SPEEDWAY SCALES WILL BE FINAL!
BALLAST WEIGHT: Added weight must be in block form of no less
than five (5) pound blocks. If ballast weight is needed to make
total weight, it must be securely fastened to the frame rails,
be painted white and car number painted on weight in a dark
color. Material and mounting must be acceptable Spencer
Speedway. NO steel or lead pellets. NO weight is to be mounted
in driver's compartment.
2. BODY
All bodies must be reasonably neat and stock appearing, must be
painted and neatly lettered. Numbers from 00 to 99 two digits
only, no letters'. Number must be registered with Spencer
Speedway. The rear of the roof, at the highest point, shall be
no more than three (3) inches higher than the actual front
measurement. A maximum height of 35 inches is allowed on the
tail light panel measured from the ground to the spoiler
mounting point. Minimum body height is 40 inches. Body height
shall be determined by measuring. NO decals allowed on spoiler.
3. FRAME / SUSPENSION
All construction must be safe, professional and acceptable to
Spencer Speedway. MINIMUM of 2 inch Frame ground clearance will
be measured at frame rail between front and rear wheels. Checked
with driver in car.
4. ROLL CAGE
Must be constructed of seamless round steel tubing
with a minimum of 1 1/2 inch outside diameter .095” wall
thickness. There are several allowable variations to the basic
roll cage design that are subject to the discretion of Spencer
Speedway. Spencer Speedway decision on roll cage design and
safety is final. The mandatory six point cage must surround the
driver.
5. CHASSIS RULES
Open to steel bodied automobiles provided they comply with, and
adhere to, specifications as outlined for this division.
A. COMPETING MODELS
Spencer Speedway Sunoco Weekly Modified Series races are open to
eligible 1980 through current year models of American made steel
bodied passenger car production sedans. Unless otherwise
authorized by Spencer Speedway, all combination Events shall be
governed by the 2010 Spencer Speedway specifications.
APPROVED COMPETITION MODELS
BUICK Skyhawk
CHEVROLET Cavalier, Monte Carlo, Beretta
CHRYSLER Eagle, Talon
DODGE Avenger, Stealth, Daytona
FORD Escort, Mustang , Probe
OLDSMOBILE Firenza
PLYMOUTH Laser, Sundance
PONTIAC Sunbird, J 2000, Grand Prix
OTHER APPROVED MODELS Other models may be selected when
available providing they are the same in body configuration and
meet the spirit and intent of competitive racing as currently
evidenced in Spencer Speedway Sunoco Weekly Modified racing.
GENERAL CAR BODY REQUIREMENTS (CAR BODIES)
ROC Modified body rules with the following exceptions.
THE CAR BODY MUST MEET THE FOLLOWING REQUIREMENTS:
Cars must be neat appearing. Aluminum may be used on the body,
Steel must be used for the interior All bodies must be installed
on frame in a manner acceptable to Spencer Speedway. Window
openings must remain stock appearing and must maintain the
original manufacturers window opening configuration. Cars will
not be allowed to compete with altered window openings. Bodies
must be no wider than the standard width from the front of the
door panel to the rear of the quarter panels when measured
beneath the car at the rocker panels. A minimum distance of 43
inches and a maximum distance of 45 inches is permitted across
the body at the bottom of the front windshield opening. Bodies
must not extend below the frame at the side rails. Skirts or
additional metal may NOT extend below the body. The floor area
directly beneath the seat forward to the front engine firewall
must be made using a minimum 1/8 inch steel. The remainder of
the floor area to the right and rear of the seat must be made
from minimum 22 gauge steel. All floor area panels must be
welded together. Streaming at the top of the windshield will NOT
be permitted. Bodies must have standard appearing windshield
opening and the windshield post must follow standard
configuration. Cars will NOT be permitted to compete with
excessive body damage. (Excessive body damage to be determined
by Spencer Speedway) Belly pans will NOT be permitted. A belly
pan will be defined as any object or material that alters the
flow of air under the car. Determination of whether any material
or object is or is not a belly pan shall be in the discretion of
Spencer Speedway. Bottom panel of the front nose panel may NOT
extend rearward past the edge of the harmonic balancer. The
driver's compartment may be enclosed with additional sheet
metal. All interior sheet metal must be minimum 22 gauge steel.
Interior sheet metal CANNOT be higher than or enclose a standard
window opening. Sheet metal in driver's compartment must be
horizontal from the top of the drive shaft tunnel to the right
side door bars or angle from top of drive shaft tunnel upwards
to top of right side door bars. Angled or horizontal metal must
extend from the rear firewall or back of seat a minimum of 26
inches forward. The interior sheet metal behind the rear hoop
may be roll formed upward to the top of the rear hoop cross bar.
The sheet metal must extend rearward and at the center of the
rear axle housing, the sheet metal may angle upward and seal to
the bottom of the rear window opening. Interior spoilers, wings,
or wind deflectors will NOT be permitted. Double panels will
NOT
be permitted. All interior sheet metal subject to Spencer
Speedway approval.
DETAILED CAR BODY REQUIREMENTS
FRONT AIR DAM
An approved air dam may be mounted to the front
underside of cars. The optional metal or vinyl front air dam
must be mounted perpendicular to the ground and no more than
three (3) inches behind the front edge of the nose panel. Front
nose panel and air dam must not extend past the rear edge of the
front bumper and must maintain two (2) inches ground clearance.
Nose panel and air dam must not extend past outside edge of
front frame rails. Air dams must have a minimum ground clearance
of two (2) inches. All support brackets must be mounted to rear
of air dam. Horizontal or flat air deflectors must not extend
past the outer edges of the front nose panel side walls.
REAR SPOILER
All rear spoilers and spoiler mounting points must
be approved by Spencer Speedway. A solid rear spoiler of a
minimum 1/4 inch thickness clear polycarbonate only may be
installed at the rear deck lid and meet the requirements that
follow. An approved spoiler which controls the flow of air over
one surface only. The maximum spoiler size permitted shall be
eight (8) inches high by 48 inches wide. The rear spoiler must
not be wider than the standard width of the rear quarter panels,
measured across the top. The rear spoiler must be installed to
the rear of the quarter panels where the rear panel meets the
interior sheet metal. During race events the rear spoiler must
not extend past the rear edge of rear bumper. Decals or logos
will NOT be allowed on the rear spoiler. Maximum of two (2) one
(1) inch wide adjustable supports are permitted on the front of
the spoiler. A maximum of three(3) supports may be attached to
the rear of the spoiler. The supports, front or rear, may be
attached to the spoiler using a piece of one (1) by one (1) inch
aluminum angle one (1) inch long. A maximum of 35 inches
measured from the ground to the spoiler mounting point is
permitted.
HOODS / ROOF
All cars must be equipped with a hood manufactured from metal or
fiberglass. The hood must be manufactured so that it will
completely cover the engine compartment, from the left side to
the right side; turn down a minimum of four (4) inches on each
side, and cover (if used) the engine side panels. NO part of the
hood at the side panels except for the "A" post, shock and
master cylinder covers may be higher than the lowest part of the
hood. Only openings for the air cleaner and the distributor will
be permitted. NO portion of the hood may be higher than the
bottom of the air cleaner. Hoods must be fastened with positive
pin fasteners evenly spaced across the front. All hoods must be
approved by Spencer Speedway officials. Roof must be stock for
make and model of body used. Roof must be steel. No fiberglass
or Aluminum. Roof support posts must maintain the same angles as
a stock production car. The front post ("A" post) must be
mounted to the top front of the door panel. The rear post must
be anchored to the rear quarter panels. All roof panels must be
installed in a manner that is acceptable to Spencer Speedway.
The front of the roof must be secured in three (3) places: one
(1) in the center and one (1) on each side. The rear roof
quarter window panel including the door "B" post must be Spencer
Speedway approved. The front edge of the "B" post must be
located a maximum of 24 inches from the center of the rear axle
housing forward. Rear deck lid and interior panels recommended
to be of magnetic steel.
BUMPERS / SIDE RAILS
The bumpers and side rails must be rear of the car will be 57
inches and the maximum width permitted will be 66 inches. Each
end of the rear bumper (from the mounting side) must be cut on
an angle and capped with a minimum of 0.125 inch aluminum.
Spencer Speedway officials must approve alterations from this
design. All bumper caps must be welded and sharp edges must be
filed. The minimum size permitted will be 2 3/4 inches by four
(4) inches by 3/16 inch thick. Bumper must be mounted at axle
height. A maximum distance of 46 inches measured at the center
of the rear edge of the bumper is permitted. Weight reducing
holes will NOT be permitted in the bumper. Any inappropriate
bumper will be disallowed. Front and rear bumper must be
securely attached in order to COMPETE.
All cars must be equipped with rear comer rails and side rails.
All rails must be constructed using a minimum 0.083 inch thick
magnetic steel seamless tubing with an outside diameter of a
minimum 1 1/4 inches and a maximum of 1 3/4 inches. Side rail
bars should be constructed using the following guidelines:
Right side bars shall be constructed by using two (2) pieces of
magnetic steel seamless tubing. The bottom bar shall attach to
the rear of the frame rail and extend upward and outward even
with the outside of the tires, or up to a maximum of 1/2 inch
outside of the tires. The bottom side bar shall extend forward
parallel with the frame rail and angle in to the front sub frame
rail with minimal tire clearance. The bottom bar shall be
mounted centerline with the rear axle and front spindle. The top
side bar shall be attached centerline with the rear hoop cross
bar extending outward and forward to the forward most point of
the bottom bar. The top bar shall turn down, be centered on and
attach to the bottom bar. The top bar shall have an additional
support bar attached to the front roll cage leg bar centered on
the dash cross bar. An additional support bar must be added in
the center.
The bar must be attached to the frame rail and side bar. Two (2)
additional vertical support bars should be added, one (1) at the
rear and one (1) in the center of the side rail bar. The
distance measured at the front, center to center, of the top and
bottom bars at the turn down area shall be a minimum of six (6)
inches. The distance measured at the rear center to center shall
be a maximum of nine (9) inches and minimum six (6) inches. Cars
will not be permitted in competition without side rails.
Left side rail bars shall be constructed using the same
guidelines described above EXCEPT that the rear support bar may
be a radiused bar that attaches to the rear hoop bar centered on
the cross bar and extending down and attached to the frame rail.
Left side rail bars must be mounted by centering the two
parallel side rail bars with the center of the rear axle and the
front spindle or left side bars may be raised a maximum of two
(2) inches from center. Cars will NOT be permitted in
competition without side rails.
Rear corner rails must be constructed using two (2) pieces of
magnetic steel seamless tubing a minimum of 1 1/4 inches and a
maximum of 1 3/4 inches in diameter. Both pieces of tubing shall
be identically formed and welded to a steel bumper bracket at
the rear. The tubing shall angle out and upward even with the
outside of the tires, or up to a maximum of 1/2 inch outside of
the tires and maintain a six (6) inch dimension measured center
to center. The corner bumpers shall then turn in with a minimal
tire clearance to the rear quarter panels. Additional support
bars must be installed behind the body panels to the rear frame
rails and/or roll cage. Cars will not be permitted in
competition without rear comer rails.
6. FRAMES
All frames must meet the requirements described in the following
paragraphs. Aluminum or light alloy frames will NOT be
permitted.
A. FRAME REQUIREMENTS
1. All frames are subject to Spencer Speedway approval. A
minimum ground clearance of two (2) inches must be maintained on
any part of the frame. All frame components must be made of
steel and welded. Holes drilled in frames, frame supports, and
cross members with the intent of making the metal lighter are
not permitted.
2. Side frame rails and rear kick up must be constructed with
.090” minimum thickness meeting the ASTMA 500 specifications,
and be a minimum of two (2) inches wide and three (3) inches
high magnetic steel box tubing.
The distance from the centerline of the driveline to the left
side frame rail, measured anywhere along the frame, must be
within six (6) inches (eight (8) inches on 1989 and newer models
with the frame rail and roll cage extension) of the distance
from the centerline of the centerline of the drive train to the
right frame rail. A minimum width of 34 inches and a maximum 46
inches, measured from center of left frame rail to center of
right frame rail, must be maintained in the drivers compartment.
A minimum width of 31 inches and a maximum of 46 inches,
measured from center of left frame rail to center of right frame
rail, must be maintained on the rear kick up, with exception for
suspension and tire clearance. All rear kick ups must maintain a
minimum of 18 degrees from side frame rails to top of kick up.
3. The fuel cell reinforcement bar, using a minimum 1 1/2 inches
seamless (3) vertical supports of 1 3/4 inches by 0.083 inch
minimum seamless round magnetic steel tubing connecting it to
the rear frame cross member. The main roll cage bar and the
front roll bar legs must be connected with four (4) horizontal
door bars on both left and right sides. The top door bar on each
side must have a vertical vent window bar welded upward and
connecting to the front roll bar legs. An optional vertical bar
may extend from the roof hoop bar radiused outward and turn down
to the top horizontal door bar on driver’s side. The minimum 1
1/2 inch steel seamless tubing should be located in line with
the driver. The door bars must be convex in shape and spaced
from top to bottom as equal as space permits. The door bars must
be the same length and have an equal amount of convex in both
the right and left sides. The door must have six (6) vertical
studs per side of 1 3/4 inches by 0.083 minimum seamless round
magnetic steel tubing equally spaced. Two (2) angular studs must
be attached from next to the bottom door bar to the frame rail.
Right side door bars must cover a minimum of 25 inches of door
length and may be either four (4) horizontal bars with six (6)
vertical studs or two (2) horizontal bars and two (2) bars
configured in an X design. If the X design is used, a vertical
bar must connect through the center of the X from the top
horizontal bar to the frame. A roof support bar must also extend
from the right front corner of the roof bar down to the
transmission cross member. All joints where bars meet the main
frame and meet the door bars, the roof bar and the rear support
bars, MUST have gusset plates for reinforcement. Magnetic steel
tubing, must be installed behind the fuel cell. This
reinforcement bar must be as wide as the fuel cell and as low to
the ground as the fuel cell with a minimum of two (2) uprights
from the reinforcement bar to the rear frame cross member,
evenly spaced behind the fuel cell. An X cross member made of
one (1) inch magnetic steel tubing must be installed beneath the
fuel cell from corner to corner. The X cross member must be
welded or bolted to the rear frame rails in a secure manner. Two
(2) additional support bars, one (1) at each corner of the
protective bar, must extend forward and be welded to the rear
frame assembly.
4. The front sub frame assembly must be constructed using a
minimum 0.083 inch thickness meeting the ASTMA 500
specifications, two (2) inches wide and three (3) inches in
height steel tubing. A minimum of 27 inches, and a maximum of 32
inches, measured from center of left frame rail to center of
right frame rail, must be maintained from the mounting point of
upper control arms forward. All front sub frame assemblies must
maintain a minimum of 30 degrees angle from side frame rails up
to the top of the sub frame. All sub frame assembly support
bracing shall be a minimum 0.090 inch by 1 3/4 inches round
magnetic steel seamless tubing. Frame support bars, left and
right, must extend from the roll cage to the sub frame and must
have a downward radius bent into the bars before they are welded
to the sub frame. The left and right support bars must not have
any additional braces added between the front leg bars and where
they attach to the front sub frame assembly. A flex support tube
may be added to the front support bar at the radius and extend
forward and be attached to a cross member. Any frame rejected by
Spencer Speedway for showing poor workmanship will not be
approved until necessary corrections have been made.
The minimum wheelbase permitted in the Spencer Speedway Sunoco
Weekly Modified class competition is 107 inches. When measuring
the wheelbase, the minimum allowable tolerance CANNOT exceed one
(1) inch plus or minus on the other side.
7. ROLL BARS
Round magnetic steel tubing 1 3/4 inches by 0.090 inch seamless
rollover bars are compulsory for the basic roll cage and must be
Spencer speedway approved. Aluminum and/or other soft metals are
NOT permitted. Roll bar connections MUST be welded.
MUST be four
post minimum fastened to top of frame. MUST have X or diagonal
brace in case behind driver. Seat to be fastened to top of cage
and frame. Nerf bars must conform to the same as asphalt
modified. Bumpers and nerf bars must be built on 14 inch
centerlines. Center of front and rear bumper must be at the
center of tire height 14 inches. Bumper must be smooth and
capped. MUST have drivers side window net. Fire resistant
padding MANDATORY on all bars located near driver. May use one
piece pad on drivers door bars. MUST have vertical bar in middle
of front opening of windshield (minimum 1 inch O.D.)
8. FAN SHROUD AND DUCTS
When ducting air from the nose housing to the radiator, air
directional shields are permitted within the duct.
9. STARTER
Car must have self working starter and must work at the
beginning of the race.
B. SAFETY
1a. IGNITION SHUT OFF SWITCH:
All open wheel cars must have the
(tigor) ignition cut off switch, it will be checked and it must
be operable.
1b. SEAT AND SHOULDER HARNESS
All seats must be aluminum and have head rests or high back
seat. Seat must be attached to roll cage and frame. Back of seat
must be mounted to the roll cage. NO fiberglass or plastic
seats. Driver must use a minimum three inch quick release, 5
point restraint systems. A two inch wide crotch strap is
mandatory. All safety belts must be no more than three years
old, and have readable identification tag. Any belts older then
three years will not be allowed. NO original equipment belts
permitted. Shoulder harness must be connected to the roll cage.
All lap belts must be mounted behind the seat and attached to
the roll cage according to manufacturer specifications. All roll
bars and driver side bars or other protrusions that driver may
come in contact with must be properly padded with approved race
car roll bar padding. All cars must have a working fire
extinguisher in easy reach of the driver. On board central fire
extinguishing systems are highly recommended. Driver side net
with quick release mechanism is MANDATORY. No plastic parts
permitted. Boldly labeled fuel and electrical safety switches
are to be in reach of Driver and safety crews.
HANS OR HUTCHINS HEAD AND NECK RESTRAINTS ARE MANDATORY!!
2. FIRE SUIT/ HELMET
All drivers must wear a clean one piece SFI 3.2 drivers suit
quilted and or with Nomex. Underwear, head socks, gloves, foot
socks and shoes must meet SFI specifications.
3. GLASS WINDSHIELD
A single one (1) piece flat or radiused type polycarbonate/
lexan windshield may be used on the drivers side. The windshield
must be mounted flush with the cowl or dash panel and extend up
to the top of the windshield opening in front of the driver.
Regardless of the type of windshield being used, it cannot be
wider than the center of the windshield opening. A complete
steel windshield screen (with maximum openings of one (1) inch
by two (2) inches must be installed in the right side of the
windshield opening. The windshield screen must cover the right
side windshield opening from the center windshield bar to the
right side roll bar and from the front hoop bar, at the top,
down to the cowl or dash panel. Decals will NOT be permitted on
the windshield. All windshields, windshield screens and their
installation must be acceptable to Spencer Speedway. Driver
window must have window net.
4. FIRE WALL
A front and rear firewall of a not less than 22 gauge magnetic
steel must separate driver from the engine compartment and fuel
cell. The front firewall must be positioned below the leading
edge of the windshield.The fire walls must be sealed and welded
in place.
5. SUSPENSION
All suspensions and related parts must be reinforced and meet
the following requirements:
COIL SPRINGS
Coil over front springs. One spring per wheel. STEEL ONLY.
1. Coil over must mount to lower control arm.
2. Strut bars will NOT be permitted for mounting of coil over.
3. Coil over springs must steel and will be constructed with
both coil ends closed and ground.
COIL OVER REAR SPRINGS
Coil over springs must steel and will be constructed with both
coil ends closed and ground.
6. SWAY BARS
Only magnetic steel front sway bars are permitted. Rear sway
bars (anti roll bars) will NOT be permitted.
7. SHOCK ABSORBERS
The use of shock absorbers must meet the following requirements:
Coil over shock absorbers may be used. Shock absorbers and coil
over shock and spring, by visual reference, must remain within
the outline of the body and NO holes can be cut in the outer
body for the mounting of shocks.
SHOCKS; Only one (1) shock per wheel. All shocks subject to
Spencer Speedway approval. NO shock with a published racers net
price greater than $300.00 U.S. currency will be permitted. Any
shock to be approved must be available to all competitors.
The only shock absorbers and internal components permitted will
be those shock absorbers submitted by the manufacturers and
approved by Spencer Speedway officials. A maximum of one (1)
shock absorber per wheel is permitted. External shock absorber
reservoirs will NOT be permitted.
8. A FRAMES
The upper A frames and lower control arms must meet the
following requirements: Upper A frames and lower control arms
must be acceptable to Spencer Speedway. When attaching upper
control arms to the mounting plate, only standard type
castor/camber shims or washers will be permitted.
9. SPINDLES, WHEEL BEARINGS AND HUBS
The spindles, wheel bearings and hubs must be acceptable to
Spencer Speedway and meet the following requirements: Heavy duty
magnetic steel spindles and wheel bearings are compulsory.
Aluminum or magnetic steel hubs are permitted. The front
spindles must be attached to the frame using wheel tethers and
be secured in a manner acceptable to Spencer Speedway officials.
Spindles and hubs must be approved by Spencer Speedway.
10. BODY HEIGHT REQUIREMENTS
Body height shall be determined by measuring (with driver) the
overall height of the car from a distance of six (6) inches
behind the top of the windshield on the roof centerline. Minimum
height will be 40 inches. The rear of the roof at the highest
point shall be NO more than three (3) inches higher than the
actual front measurement.
11. GROUND CLEARANCE REQUIREMENTS
Frame rail and sheet metal clearance will be two (2) inches. All
ground clearance requirements will be measured with the driver
in the car.
12. WEIGHT SHIFTING DEVICES
Mechanical devices for shifting weight which can be activated by
the driver will NOT be permitted inside of drivers compartment.
Electrical, pneumatic, hydraulic or remote control devices which
change the handling characteristics or height of the car are NOT
permitted.
13. STEERING COMPONENTS
The car steering components must meet the following
requirements: Rack and pinion steering ALLOWED. All cars will be
equipped with a magnetic steel steering shaft. Tie rods, drag
links and component parts must be heavy duty. Interchangeable
pitman arms may be used. Pitman arms may NOT be drilled for
weight reduction. Center top of steering post must be padded
with at least two (2) inches of resilient material. A quick
release magnetic steel or aluminum coupling on steering wheel is
MANDATORY. The coupler CANNOT be covered with plastic. The use
of universal joints in steering shaft must be approved by
Spencer Speedway. Only metal or aluminum steering wheels are
permitted. NO Plastic The power steering pump must be mounted
and driven off the front of the engine.
14. BRAKES & BRAKE COMPONENTS
The car brake components must meet the following requirements:
Four (4) wheel disc brakes MANDATORY. Only magnetic cast iron or
cast steel rotors will be permitted. Brakes must be operational
on all four (4) wheels at all times. Master cylinders and
reservoirs should be mounted on the engine side of the front
firewall. Inboard brakes are NOT allowed. Electric wheel speed
sensors or brake actuators will NOT be permitted. Power assisted
braking systems will NOT be permitted. Only one (1) brake
caliper per wheel using only two (2) brake pads per caliper will
be permitted. Only a single brake bias system which connects to
the balance bar of the brake pedal assembly will be permitted.
Inline brake proportioning systems will NOT be permitted.
BRAKE COOLING
The brake cooling system must be acceptable to Spencer Speedway
and meet the following requirements: One (1) air duct per wheel
may be used for brake cooling. All scoops must be acceptable to
SST. Maximum dimension of front brake air scoops is three (3)
inches by eight (8) inches when mounted to the front sub frame
or front bumper. If the brake scoops are not operational, they
must be blocked off. Screens and air ducts, from the opening to
the brakes, must be acceptable to Spencer Speedway officials.
Brake fluid recirculating devices will NOT be permitted.
15. BATTERY
Only one 12 volt battery. Battery must be located between the
frame rails. Battery must be securely anchored and mounted
inside a spill proof container located under hood or floor of
the car. If located under the floor, the battery must be
completely encased. If located under the hood, the battery must
have suitable cover. NO battery may be forward of the radiator
or rear of the rear end housing of the car. Battery location
must be acceptable to Spencer Speedway officials.
16. ELECTRICAL SWITCH LOCATION
All electrical switches must be located on the dash panel or
within easy reach of the driver. A labeled on/off master switch
to the battery cable MUST be installed on the cowl behind the
windshield opening on the right side of the driver. The switch
must be easily accessible and in plain view.
17. ENGINE COOLING SYSTEM
Engine cooling system must be acceptable to Spencer Speedway.
Icing, Freon type chemicals or refrigerants may NOT be used in
or near the engine compartment. Portable cooling machines or
devices will NOT be permitted.
18. TRANSMISSION
The transmission must meet the following requirements: Only
standard production OEM type Muncie or T 10 manual three (3) or
four (4) speed transmissions are permitted. May remove first
gear and replace with spacer. Automatic transmissions allowed.
Only aluminum, or steel transmission housings are permitted.
Only OEM type gears are permitted. All transmissions must have a
constant engagement of the input shaft with gear and
countershaft with cluster and reverse gears. Spencer Speedway
reserves the right to have all cars use a final drive gear ratio
within the limits set by Spencer Speedway. Any method or
transmission gear higher than 1.18 to 1 will NOT be permitted.
The only high gear transmission ratio allowed will be 1 to 1. A
forward gear and reverse gear MUST be in working order.
ONLY manual shift linkage is permitted on the transmission. ONLY fire
resistant type shifter boots are permitted. The Jerico
transmission will NOT be permitted. No automatic transmissions
allowed.
19. RADIATOR
The engine cooling radiator must meet the following
requirements: Radiator must remain in front of the engine.
Radiator dust screens PERMITTED. Radiator MUST be copper, brass
or aluminum. Radiator installation must be acceptable to SST.
Radiator overflow pipe MAY be relocated and a minimum one (1)
gallon overflow can. NO anti freeze. WATER ONLY.
20. CLUTCH
The clutch and clutch assembly must meet the following
requirements: Must be disc / pressure plate design clutch
assembly. NO coupler type / Dog clutch or direct drives.
Multiple disc clutches are permitted. Minimum 7 1/4 inch
diameter disc and using one (1), two (2) or three (3) disc
design. Limited to magnetic steel discs, Steel or Aluminum
pressure plates.
The disc clutch housing assembly or cover shall be made from
aluminum or steel ONLY. Any single disc OEM production type
clutch assembly, with a minimum 10 1/2 inch diameter steel hub
disc.
Clutch MUST be mounted inside an approved bell housing.
21. DRIVE SHAFT
The drive shaft must meet the following requirements: Drive
shaft, universal joints and yokes must be magnetic steel drive
shaft and be similar in design to standard production type. Only
a one (1) piece magnetic steel drive shaft will be permitted. It
is MANDATORY that two (2) 360 degree solid magnetic steel
brackets, NO less than two (2) inches wide and 1/4 inch thick,
be placed around the drive shaft and torque arm and be fastened
to the cross member of the car. All drive shafts MUST be painted
white or orange.
22. REAR AXLE
The rear axle must meet the following requirements: Aftermarket
racing steel spool, steel mini spool. axle shafts and gears are
permitted. Clip in axles MUST be welded in place. Aluminum or
magnesium quick change and non quick change center sections
equipped with aluminum or magnesium side bells are permitted. If
quick change rear ends are used, only those with magnetic steel
spur gears on the back side, jackshafts and axle tubes will be
permitted. Quick changes rear ends must have the gears in the
rear of the quick change Front loaders are not permitted. Ring
and pinions in Quick changes must not be smaller than 10 inch.
No mini quick changes. ONLY locked rear drive axle assemblies
are permitted at all times during an Event. Limited slip
differentials are NOT permitted. For purposes of checking a pre
determined final drive gear ratio, when jacked up both rear
wheels must rotate in the same direction with each traveling the
same rotational distance. The distance, measured from the center
of the rear end housing to the rear hubs, left and right, at the
point the wheels bolt on, must be within three (3) inches in
length. Only magnetic steel axle housings permitted. The rear
end must be mounted so that the inside edge of the left rear
tire is even with or outside the outermost edge of the left side
frame rail. Spencer Speedway reserves the right to have all cars
use a final drive gear ratio within the limits set by Spencer
Speedway. If axle housing support bars are used, they must not
have any method of adjustment.
Quick change rear ends use a 4:86 or 5:04 gear. Non quick change
use a 4:86 gear.
FUEL:
Sunoco fuel will the official fuel for Spencer Speedway for the
next 5 years (starting 2010 season). Sunoco purple 110 fuel will
be sold at Spencer Speedway. There will be no mixing of fuel and
no additives added to the fuel. Fuel will be tested weekly. Any
fuel not meeting track specs will be deemed illegal and you will
be disqualified. All car owners in
the Sunoco Mod class is required to purchase and run 5 gallons
of the Sunoco 110 fuel each week, unless you are running a Crate
engine. You need to make sure a receipt is given to you for your
purchase. You will be asked for your receipt at some point
during the night so keep it handy. Your receipt will be numbered
and a copy will be kept in your file. You may purchase a barrel
of fuel and that will count towards your weekly fuel purchase.
If you are found not to have purchased 5 gallons of fuel at the
track each night you could lose all money and points for that
night, and a fine may incur.
23. FUEL SYSTEM
Spencer Speedway will reject any fuel cells, containers or check
valves which appear to be damaged, defective or do not function
properly. Fuel cell vent pipe check valves are compulsory.
Pressure systems will NOT be permitted. Any concealed pressure
type containers, feed lines or actuating mechanism will NOT be
permitted, even if inoperable.
24. FUEL CELL
The use of a commercially manufactured fuel cell is MANDATORY.
The maximum fuel cell capacity, including the filler spout and
overflow, shall not exceed 24 gallons. The nominal fuel cell
dimensions are 24 1/4 inches by 16 3/8 inches by 13 1/4 inches.
Materials other than standard foam, as provided by an approved
fuel cell manufacturer, are NOT permitted. Fuel cell must be
encased in a container of not less than 22 gauge magnetic steel.
Fuel cells must be fitted within the container so that the
maximum capacity, including filler spout will not exceed 24
gallons. Fuel cell container size shall be 25 inches by 16 3/4
inches by 13 5/8 inches (inside dimensions) Interior magnetic
steel sheet metal must allow access to top of fuel cell for
inspection. Fuel cell and fuel cell container must be installed
as far forward as possible in trunk compartment behind the rear
axle and maintain a minimum ground clearance of six (6) inches.
Fuel cell container must be secured by one (1) inch by one (1)
inch by 0.065 inch minimum thick square steel tubing meeting the ASTMA 500 specifications or one (1) inch by 1/8 inch thick
magnetic steel straps two (2) lengthwise and two (2) crosswise.
The straps must be located as close to the fuel filler check
valve housing as possible.
25. FUEL FILLER VENT REQUIREMENTS
The maximum filler spout size is four (4) inches by eight (8)
inches by 18 inches.
26. FUEL CELL VENT (vented as follows)
A single, one (1) inch maximum vent to outside of body at left
rear corner. A fuel vent flap valve must be used. The fuel cell
check valve vent pipe neck inside diameter shall not exceed one
(1) inch maximum. The fuel cell vent flexible hose shall have a
maximum inside diameter of 1 1/4 inches and a maximum length of
60 inches when measured from the outside end of the fuel cell
check vale vent pipe to the top of the fuel cell fill plate. A
screen cap with a maximum diameter of 1 1/4 inches may be placed
over the vent.
27. FUEL LINES
Either (or both) right or left side pickup in fuel cell may be
used as approved by Spencer Speedway. ONLY one (1) fuel line
permitted from fuel cell to fuel pump. All fuel lines are
subject to Spencer Speedway approval. The fuel lines from the
fuel cell to the carburetor may be relocated to prevent vapor
lock, but must remain under floor of car unless otherwise
approved. When the fuel line runs through the right side of the
driver’s compartment, it must be enclosed in a one (1) inch
outside diameter magnetic steel tube. Spencer speedway approved
check valve mounted at the line outlet on the fuel cell is
recommended. Additional lines or extra length may not be used on
the fuel system, Extra fuel lines or fuel cells, concealed or
otherwise prohibited. It is recommended that an on off switch be
mounted within easy reach of driver.
28. FUEL PUMP
Electric fuel pumps are not permitted. Cooling of the fuel pump
is not permitted. Only mechanical fuel pumps in stock location
permitted. No Piston Pumps.
29. ENGINE LOCATION
The engine location must be approved by Spencer Speedway. The
engine must be mounted between the frame rails in front of the
driver. The centerline of the crankshaft when measured to the
center of the lower ball joint, left and right, must be within
two (2) inches in distance. Engine minimum crankshaft center to
ground clearance is 9 1/2 inches. The engine may NOT be tilted.
30. ENGINE GROUND CLEARANCE
Engine ground clearance will be measured (with driver in car) at
the oil pan. A minimum height of two (2) inches from the bottom
of the oil pan to ground MUST be maintained at all times.
31. ENGINE MOUNTS
All engine mounts shall conform to the following requirements:
Engine mounts must be reinforced and must be acceptable to
Spencer Speedway. All engine mounts MUST be securely bolted.
32. ENGINE DISPLACEMENT/COMPRESSION LIMIT
Only "small block" V 8 engines with a minimum of 350 cubic inch
displacement will be allowed. To clarify the identification of a
"small block" engine, listed below are the basic engines
designated and approved as "small block" engines. Any engine
NOT listed will be designated as a large block engine and will
NOT
be permitted, regardless of the engine size.
Maximum engine displacement as follows:
1. GENERAL MOTORS 350 CU. INCHES
2. FORD 351 CU. INCHES
3. MOPAR, AMERICAN MOTORS 360 CU. INCHES
Engine displacement may be increased by boring. Formula for
determining cubic inch displacement: Bore x Bore x .7854 x
Stroke equals cubic inch displacement of each cylinder. The
cubic inch displacement of each cylinder added together will
determine the total cubic inch displacement of the engine.
COMPRESSION LIMIT:
The maximum compression limit allowed shall
be 11.0 to 1 on any cylinder. When calculating the compression
ratio, an allowance of one (1) cubic centimeter will be added to
the volume for the area around the top of the piston down to the
top of the piston ring that will be sealed with grease. * The
procedure for checking compression is as follows: Bore x Bore X
.7854 x Stroke equals the Cylinder Volume of each cylinder at
Bottom Dead Center (bdc) in cubic centimeters. The cylinder head
pour volume minus( ) the known volume of the cylinder head plate
plus (+) head gasket volume plus (+) 1.00 cc for sealing piston
ring plus (+) the cylinder block volume minus( ) the known
volume of the block plate equals(=) chamber volume. (Compression
ratio = Cylinder Volume plus (+) Chamber Volume)
33. ENGINES
Maximum compression ratio 11.0 to 1, 2600 lbs. after race. 9.6
to 1 maximum will be given a weight break of 50 lbs. for a total
weight of 2550 lbs. after race. Compression will be checked with
a whistler. V 8 engines only. NO aluminum engine blocks or
heads.
BLOCK
GM Chevy 350 cu. In standard production block with stock
external and internal measurements. Bore size of 4.00 to 4.060
only (+.005 tolerance)
Bowtie Block # 124800474 allowed. Dart block part # 3116111 will
be allowed. Block must be centered between frame rails and not
tilted. Must be securely mounted to frame. Center of crankshaft
must be within 2 inch center of thread width.
CRANKSHAFT
Only stock production type crankshaft can be used. Standard
steel or cast iron. Aftermarket crankshafts must be identical to
stock OEM in appearance, construction, weight and journal size.
Counterweights must be the same shape and size of stock OEM
crankshaft. Minimum crankshaft weight 48 lbs. Chevrolet must use
LARGE journal size crankshaft. Stroke 3.480 only (+ or .005).
Counterweights must remain stock. No undercutting. No knife
edging, tapering or altering in any weigh. Except for normal
balancing, by drilling, turning, or adding #. Rod journals stock
diameter with tolerance of .020 Light deburring permitted,
however forging or casting flashing must remain. Harmonic
balancer minimum diameter 6.25 inches. Fluid dampener is legal.
Centerline of crankshaft minimum 9 ½ inches from the ground.
CONNECTING RODS
OEM stock rods or aftermarket rods. Machining for bushing or
full floating is allowed. 5.700 or 6.000 forged or billet
connecting rod permitted, for Chevrolet. Aftermarket 5.700
forged or billet minimum weight 575 total grams. Aftermarket
6.000 forged or billet minimum weight 600 total grams. Maximum
Ford rod length 6.000 Mopar rod length 6.125. NO de burring, de
flashing, polishing abrasive cleaning or lightening. NO
titanium, aluminum, max light aerospace alloy rods allowed.
PISTONS
Flat top or dished aluminum three ring pistons only. All three
rings in place. Valve relief’s may be machined in pistons. Any
steel pin may be used.
CYLINDER HEADS
NO PLATINUM HEADS ALLOWED.
Heads must be any 23 degree, unported cast iron, from listed
manufacture.
Chevrolet – World casting #011150 –Angle plug, #011250 –Straight
plug
Proaction #2234 00000A – Angle plug, #2234 00000 – Straight plug
Proaction #12320 Angle Plug, #12319 Straight Plug
Ford #M 6049 N351, N352
Mopar #W 2
GM Cast bowtie heads #’s, 10134392, 14011058, 14011034
Maximum intake runner volume of 200 cc’s. No porting to reach
maximum runner volume. NO G.M. VORTEC CYLINDER HEADS OF ANY
TYPE.
Heads must retain stock internal, external measurements. No port
matching, blending, porting, polishing, removal or addition of
materials to head. No hand grinding or acid dipping permitted on
any part of the head. No paint, epoxy fillers, welding or spray
welding on heads. External painting to match engine allowed.
Manufacturers spec and intake runner CC size will apply on all
heads listed. NO TOLERANCE.
a. All valves must identical in appearance in construction as
OEM type valve. Minimum valve stem diameter 11/32 inch. Valve
stem diameter may be undercut to a minimum diameter of 15/16
inch in the area of the valve stem from the head of the valve to
the bottom of the guide.
b.Valve must be solid stainless steel only.
c. Valve springs and push rods must be magnetic steel only.
d. Screw in studs allowed.
e. Roller rockers and girdles are allowed. No shaft rocker arms.
f. Chevrolet intake valve 2.020 exhaust valve 1.600.
g. Ford Windsor intake valve 1.844 exhaust valve 1.546.
h. Ford Cleveland intake valve 2.046 exhaust valve 1.546.
i. Ford #M 6049 N351 intake valve 2.020 exhaust valve 1.600.
j. Mopar Corp intake valve 2.020 exhaust valve 1.625.
k. ½ inch under valve seat to complete valve job allowed.
Machine cut only. No polishing or blending.
l. Heat risers can be filled.
m. Multiple angle valve job with valve centerline and guide
angle in OEM stock location in relationship to the head.
n. No combustion chamber modifications.
o. No repositioning head on block. Stock location only.
p. No air directional devices.
CAMSHAFT
Flat tappet camshaft only. NO roller camshaft. NO mushroom or
roller lifters. Lifters must be stock diameter. No roller
camshaft bearings.
TIMING CHAIN
Any timing chain and gears may be used. Degree bushing and
offset crank gear keys may be used. Gear drives may be used.
ROCKER ARMS
Roller rocker arms permitted. NO shaft mounted roller rocker
systems.
PUSH RODS
Magnetic steel valve push rods are permitted only.
34. ENGINE LUBRICATION
A. OILING SYSTEM
Internal oil pumps driven from the distributor are required.
B. OIL PANS
Magnetic steel oil pans only.
C. OIL PAN INSPECTION PLUG
Is required on the left side of the oil pan. The inspection hole
must be a minimum of 1 1/4 inch I.D. It must be 9 1/2 inches
from the rear block face to the centerline of the inspection
hole or 4 1/2 inches from the front block face to the centerline
of the inspection hole and 1 1/4 inches from oil pan rail. There
will NOT be any obstruction of view from the inspection hole to
view crank and rods.
D. VIBRATION DAMPER
Stock type steel or cast iron. NOT to be machined or altered in
any way.
E. DISTRIBUTOR
Battery operated ignitions only. Stock type point distributor or
electronic ignition allowed. NO ignition boxes or multi spark
systems. Aftermarket coils must fit in stock location. May use
aftermarket H.E.I. stock replacement type distributor. MSD H.E.I.
# 8365 permitted.
F. WATER PUMPS
Only OEM type steel or aluminum mechanical water pumps in stock
location, turning in the same direction of the crankshaft
rotation, are permitted. Water pump impellers may be altered but
coolant flow must be in the same direction as the production
engine.
35. CARBURETOR
Unaltered HOLLEY #4412 500CFM only. HP Carburetor allowed.
Must be approved by SPENCER SPEEDWAY officials. Choke horn may
NOT be removed. Boosters may NOT be changed Booster size or
shape may NOT be altered. NO sideways carburetors allowed.
Venturi area must NOT be altered. Casting ring must NOT be
removed. NO grinding or polishing. NO modifications to the base
plate. Throttle shafts must remain standard and must NOT be
thinned or cut. Stock butterflies may be drilled for idle holes
but must not be thinned or tapered. Removal of the choke plate
and choke linkage. Changing of jets accelerator pump nozzle,
pump cam and power valves permitted. Alterations to allow
additional air to be picked up below the opening of the venture
such as altered gaskets, base plate or drilling holes into the
carburetor will not be permitted. No epoxy fillers
36. CARBURETOR ADAPTOR PLATE / SPACER
Only one solid spacer made of aluminum or pheonolic plastic of a
maximum height of one (1) inch permitted. Only one .075 maximum
gasket per side. NO wedge shaped mounting surfaces, both top and
bottom surfaces must be parallel. Spacer must have 2 holes
maximum size 1.750 straight bore and match the base of
carburetor. No air flow
modifications.
37. CARBURETOR THROTTLE
All linkage must be mechanical type. NO cable type. Two springs
MANDATORY.
Toe strap MANDATORY.
38. AIR CLEANERS AND AIR FILTERS
MAXIMUM OF 5 INCHES IN HEIGHT. All air must be filtered through
the element. Top of the air cleaner must be solid with NO holes.
Top and bottom of the air cleaner must be of the same diameter.
NO air induction, ducts, baffles, tubes, funnels, or
hats which may
control the air leading to or
through air filter, or inside air filter to redirect air into
carburetor. The filter base must have a minimum
round opening of 5 inches.. It will be permissible to shield the
front area of the air cleaner up to a maximum of one half of the
air cleaner circumference and no wider than the height of the
element. A one (1) inch maximum height spacer may be used
between the carburetor and the air cleaner. K&N Plastic top and
Bottom ARE NOT Allowed. Only paper air filters will be allowed.
39. INTAKE MANIFOLD
CHEVROLET EDELBROCK # 2101
CHRYSLER EDELBROCK # 2176
FORD #M 9424 C358 EDELBROCK # 2181 EDELBROCK # 2750
NO alterations or modifications to manifolds allowed.
NO
coatings allowed on or in manifold with the exception of paint
only on exterior surfaces. Identification in the form of cast in
part numbers must remain unaltered on the manifold.
40. EXHAUST SYSTEM
(officials reserve the right of reject improper mounted exhaust
systems) Exhaust headers must be a commercially manufactured
header using a steel primary tube size of 1 5/8 inch minimum and
a maximum of 1 3/4 inch outside diameter. 1 5/8" to 1 3/4" step
header permitted. Must be a conventional four into one collector
with a maximum size of 3 1/2 inch OD. Maximum header flange will
be 3/8 inch. NO header plates between heads and headers.
NO
adjustable headers. NO inserts allowed in any part of the header
or collectors. NO 180 degree headers. NO stainless headers.
NO merge. NO pyramid. No Try y or similar style collector
permitted. NO exhaust pipes allowed in driver's compartment. NO
thermal wrap permitted on headers. NO crossover pipes permitted.
All exhaust pipes must be a single round steel 3 1/2 inch pipe,
with muffler.
41. HEAT SHIELDS
Heat shields to cover exhaust manifold can be NO more than six
(6) inches wide and NO longer than the valve cover.
42.MUFFLERS
No car will be allowed to race without mufflers. No
modifications of any type allowed on muffler. Only legal muffle
will be the lobak part #’s 30 12 30, 35 12 35 3” or 3 ½” inlet
outlet with 12” body. MUST BE REMOVABLE FOR INSPECTION. All cars
must be a maximum of 95 decibel checked from the center of the
track. 95 D.B.A. is MANDATORY. Muffler falling off car may
result in immediate disqualification.
43. WHEELS
The wheels must meet the following requirements: Only 15 inch
diameter five (5) lug reinforced magnetic steel racing wheels
with a maximum width of 13 inches are permitted. 12 inch maximum
is recommended by most tire manufacturers. Any offset is
permitted. Wide five bolt pattern OPTIONAL. Bead locks are NOT
permitted. Maximum tread width is 84 inches measured from
outside to outside tire.
44. LUG BOLTS AND NUTS
Solid heavy duty 1/2 to 5/8 inch magnetic steel lug bolts and
standard one (1) inch hex by 1/2 to 5/8 inch thick magnetic
steel lug nuts. Lug stud threads must go through the full
thickness of the wheel nut on all four (4) wheels.
45. TIRES
Only tires approved by Spencer Speedway will be permitted. Tire
durometer 58 WILL be checked. Durometer readings may be taken
after racing competition or in the line up staging areas, any
car not meeting the specification will not be permitted onto the
racing surface. NO use of bleed off OR pop off type valves. Hand
grooving, buffing, grinding and/or cutting on any area of the
racing tire will NOT be permitted. Tires that have been altered
by unauthorized treatment will NOT be permitted.
EVERY COMPETITOR MUST MAKE THEMSELVES AWARE OF AND FAMILIAR WITH
THE TECHNICAL RULES IN THIS CLASS. EVERY INDIVIDUAL AGREES TO BE
KNOWLEDGEABLE AND BOUND BY THE CONTENTS OF THE SPENCER SPEEDWAY
SUNOCO FUEL WEEKLY MODIFIED RULE BOOK. |
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