2008 PARK JEFFERSON SPEEDWAY
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SPECIFIC MODIFIED RULES - 2008
1. SAFETY EQUIPMENT:
Rules apply at all times car is on track. Snell-rated SA95, SA2000
or SA2005 helmet required. Roll bar padding required in driver
compartment (Fire retardant
recommended). SFI-approved full fire suit required. Fire
retardant neck brace, gloves and shoes required.
Recommended: Fire retardant head
sock and underwear; head and neck restraints; collapsible steering
shaft. Driver-side window net required, minimum 16"x20"
ribbon or mesh style, and must be mounted so latch is at top front
of window. Minimum three-inch wide five point safety belt assembly
required (Y-type shoulder harness not allowed), must be mounted
securely to roll cage,
recommended to be no more than one year old. Kill switch
required within easy reach of driver and must be clearly marked
‘OFF’ and ‘ON’.
2. FRAME:
1964 or newer OEM perimeter American rear-wheel drive passenger car
frame only. No sports car frames. Frame must be full and complete,
cannot be widened or narrowed, and must be able to support roll cage
on both sides, exceptions
are: weight jack in original center line of spring
tower allowed; frame may be cut a maximum 36 inches forward from
center of rear end housing; horns may be removed in front of
steering box; front crossmember may be notched and boxed for
radiator and/or steering clearance; maximum seven-inch wide opening
in side of spring tower for spring removal. Maximum two inch wide by
four inch tall frame stiffener may be welded directly to outside of
left side frame rail. Minimum wheelbase 108 inches, maximum 112
inches, both sides. Maximum overall width (front or rear) shall not
exceed 78 inches from outside of tire to outside of tire. No part of
frame can be lower than four inches from ground except front
crossmember.
3. ROLL CAGE:
Must consist of continuous hoops, minimum 1.75 inch O.D. tubing,
with a minimum wall thickness of .095 inch for main cage,
frame-mounted in at least six places,
low carbon or mild steel
recommended. Must consist of a configuration of front,
rear and top hoops connected by tubing on sides or side hoops.
Driver’s head must not protrude outside cage with helmet on. Roll
cage must be securely supported and braced with minimum one cross
bar in top halo. Foot protection bar required. Main cage no further
forward than rear of engine. All bars forward of cage must be lower
than hood.
4. DOOR BARS:
All driver side door bars and uprights must be minimum 1.5 inch O.D.
and .083 inch wall thickness. Minimum three driver side door bars,
parallel to ground and perpendicular to driver, and welded to front
and rear of roll cage. Passenger side must have at least one cross
door bar, horizontal or angled, minimum 1.25 inch O.D. and .083 inch
wall thickness, and one top door bar, minimum 1.5 inch O.D. and .083
inch wall thickness. Steel door plate, 18 gauge or .049 inch minimum
thickness, must be securely welded to outside of driver side door
bars and cover area from top door bar to bottom door bar and from
rear hoop down-post to five inches in front of seat. Must be visible
for inspection.
5. BODY:
(See diagram) Must be same width, front to rear, and parallel to OEM
frame. Engine compartment must remain open (no side panels). Hood
must be enclosed at rear. No panel in front of right door to engine
compartment. No inner panels. No car covers. Must have front
windshield and rear window support posts. Driver and passenger side
windows must have at least 12 inch opening (height and width),
measured at center of window, between lowest point at top of window,
whether roof or roll cage, and highest point at bottom of window,
whether interior or body. May use Lexan in sail panels. May use full
windshield. Must be fiberglass full size roof, rounded down
in all directions. No wings or spoilers. Maximum four-inch plastic
skirting allowed on bottom of doors and quarters. No reflective
doors or quarter panels. Outside of tires must be widest part of
car.
6. DRIVER COMPARTMENT:
Must have minimum three windshield bars in front of driver. Lexan or
aluminum cowl panel in front of driver can be no wider than cockpit
and no farther back than steering wheel. Minimum .125 inch aluminum,
or .060 inch steel, complete floor pan required. Aluminum high-back
seat only and must be bolted in, using minimum 0.375-inch bolts,
next to left side frame rail and ahead of rear tires. Bottom of seat
can be no lower than bottom of frame rail. Driver must be sealed off
from track, driveline, engine, fuel cell, cannisters and pumps. Oil
coolers must not protrude above interior. Accumulators cannot be
mounted between driver and left-side door bars. No driver-adjustable
devices allowed while car is in competition except brake adjuster.
No mirrors of any kind.
7. FRONT SUSPENSION:
All components must be steel, unaltered OEM, in OEM location, and
replaceable by OEM parts, exceptions are: tube-type upper A-frames
with or without aluminum or steel cross shaft, and mounts can be
moved; stamped steel OEM replacement lower A-frames; rubber, nylon
or steel lower A-frame bushings, no offset or bearing type; welded
or bolted shock mount on lower A-frame. Lower A-frames must be right
and left, and of same design. Lower A-frame mounts and bolt holes on
frame must be in OEM location. OEM ball joints only. Sway bar must
be unaltered OEM.
8. STEERING:
No rack and pinion. All components must be steel, unaltered
OEM, in OEM location,
exceptions are: outer tie rod end and adjustment
sleeve may be replaced by a minimum .625 inch steel rod end and
steel tube; spindles can be ground for brake caliper clearance only;
unaltered, OEM replacement Pinto spindles with raised cast; bolt on
spindle savers allowed; steel steering shafts and knuckles only;
steering quickener, steering wheel and quick release may be
aluminum; driver compartment steering may be modified, must be kept
on left side. Spindles must be right and left, and of same design.
Idler arm, pitman arm, and center link must match frame.
9. SHOCKS:
One steel, nonadjustable, unaltered shock per wheel. One additional
shock allowed in lift- or pull-bar area. No bumpers or stops. No
threaded body, front coil-over, air, or remote reservoir shocks. No
Schrader or gas refill ports. Front half may be shielded. One or all
shocks may be claimed per event for $50 each, counting as one claim
on card, following shock claim procedures (see rule book).
10. SPRINGS:
One steel, non-progressive coil spring per wheel only. Steel or
composite leaf spring allowed. One additional spring allowed on
pull bar or lift bar, may be progressive. Any coil spring must be at
least 4.5 inches O.D. No torsion bars or air bags.
11. REAR SUSPENSION:
No independent rear suspension. All components must be steel. No
covers allowed. All trailing arms/link bars must be solid tubing.
Rear of frame may be altered to accept leaf or coil springs. Steel
coil-over eliminators, or steel or aluminum coil-over kits allowed -
must conform to shock and spring rules. One mechanical traction bar
(pull or lift, not both). Rubber bumpers allowed only on panhard bar
and mechanical traction bar. No sway bar. No chains, cables or
tethers (except on front of lift bar). Minimum 19 inch long panhard
bar, measured straight line, center to center.
12. REAR END:
Any steel approved OEM passenger car or truck rear end (housing and
carrier) allowed. Safety hubs (floater) allowed. All components must
be steel, except lowering blocks, axle cap, drive flange. Inspection
hole required in housing. Full steel spool, steel mini spool or
welded rear ends only. Steel axles only. No quick change devices, or
cambered rear ends. One piece drive flange only. No torque dividing
differentials. No scalloped ring gears.
13. BUMPERS:
(See diagram) Steel bumpers must be on front and rear at all times
and welded, or mounted with minimum .375 inch bolts. Must be minimum
1.25 inch O.D. tubing, .065 wall thickness on front - .095 wall
thickness on rear. Two-bar front bumper must be mounted frame-end to
frame-end, no wider than width of material outside frame horns and
with bottom loop parallel to ground. Top bar must be directly above
bottom bar, minimum 6.5 inches apart, measured center to center.
14. TIRES/WHEELS:
Must use unaltered Hoosier Race tire, G60-15 with IMCA stamped on
sidewall. No softening, conditioning, siping or grooving of tires
(see rule book for automatic penalties). No re-caps. All wheels must
display white ‘IMCA approved’ decal and wheel manufacturer decal.
Aluminum or steel spacers only. May use IMCA approved bead lock, on
right rear only. External, steel bead lock only and it cannot make
wheel any narrower than 8 inches and no wider than 8.75 inches. Must
use only steel bolts. One foam type or plastic mud cap allowed on
right rear only. Rim-mounted bleeder valves allowed.
15. BRAKES:
Must be steel approved OEM, operative four wheel, drum or disc. Must
maintain minimum OEM dimensions for hubs/rotors and calipers, cannot
be lightened. Bolt pattern may be changed. Larger studs allowed.
Rear rotors may be aftermarket, minimum .810 inch thickness. Vented
rotors only, no scalloped rotors. No brake shut-off or pressure
sensitive devices. One proportioning device allowed, front to rear
only. Brake lines must be visible.
16. EXHAUST:
Round tube headers only. All primary header tubes must enter
directly into one collector, at same point, at end of header.
Schoenfeld mufflers, stamped IMCA609, must be used if track has
noise reduction rule of 98 d.b. or more. All exhaust must go
through mufflers, two per car, one per header. No exhaust sensors.
17. FUEL SYSTEM:
Mechanical or belt driven fuel pump only and must be mounted at
front of engine. Racing fuel cell required, maximum 32 gallon
capacity, must be in minimum 18 gauge steel container. Cell must be
securely mounted behind rear axle, between rear tires, minimum of
four inches ahead of bumper, minimum of ten inches above ground.
Must mount with minimum two solid steel straps around entire cell,
two inches wide and .125 inch thick. All cell mounts must be steel,
securely welded to frame/cage. Protective tubing must cover rear and
extend past both sides of cell. No part of cell shall be lower than
protective tubing. Fuel cell vents, including cap vent, must have
check valves. Pick-up must be on top or right side of cell. Limit of
one fuel filter. No cool cans. Air cleaner top/stud cannot direct
air into carburetor. No top flow air cleaner housings. One
naturally aspirated two- or four-barrel carburetor only. No
adjustable throttle bore carburetor spacers.
18. FUEL:
Gasoline or alcohol. Racing fuel allowed. NO performance-enhancing
additives. Upper cylinder lube allowed with alcohol only. (See rule
book for automatic penalties).
19. WEIGHT:
Minimum weight limit of 2,450 pounds, no tolerance, after race with
driver in car. No weights and/or loose objects in driver compartment
or outside body. Weights must be securely mounted to frame or roll
cage and painted white with car number on it. Must be attached with
at least two .5 inch bolts. No titanium, magnesium or carbon fiber
products. No gun-drilled, tubular, hollow bolts or studs. Steel
fasteners only.
20. BATTERY/STARTER:
One 12 volt battery only, must be securely mounted between frame
rails, and positive terminal must be covered. Car must have
capability of starting without being pushed or pulled. Car must
leave initial staging area on demand, unaided, or go to rear of that
race. Reverse-mount starters with OEM case transmissions only, see
transmission rules for specifics.
21. GAUGES/ELECTRONICS:
No transmitting or listening devices, timing retard controls, or
digital gauges (including tach). No electronic monitoring computer
devices capable of storing or transmitting information except analog
tach. No adjustable ignition control boxes. One 12 volt ignition box
allowed, must be out of driver’s reach. No additional ignition
accessories allowed. Only change allowed to ignition box is one
high-end rev-limiter setting. This setting can be changed through
one chip only, or an internal setting inside box. No magnetos. No
electronic traction control devices (see rule book for automatic
penalties).
22.
TRANSMISSION/DRIVESHAFT: Must have at least two
forward gears and one reverse, plus a neutral position. With engine
running and car in still position, must be able to engage car in
gear and move forward, then backward. OEM production type or IMCA
approved aftermarket transmissions allowed - two-speed, three-speed,
four-speed and automatic. No five speed (or more) transmissions, ‘in
and out’ boxes, or quick change devices allowed. Functioning shift
levers must be in OEM location on all OEM production type
transmissions. All belt drive pumps must be mounted on front of
engine. Flexplates must be full, steel, unaltered OEM, or OEM
replacement. Flywheel/flexplate must bolt to engine between clutch
assembly and crankshaft and all driveline components within
bellhousing must rotate while car is in any gear. Transmission must
be one of the following designs:
OEM Manual:
Must have a standard OEM case and working disc-type clutch or
approved cone or disc-type coupler inside an explosion-proof steel
bellhousing. One flywheel only, minimum 8.5 inch diameter. Diameter
of clutch disc must be a minimum of 5.5 inches. Clutch assembly must
be steel, except housing, which must be steel and/or aluminum.
Bellhousing can have only a hole for throwout bearing lever or hose,
must be 270 degrees around top of clutch and flywheel area. Standard
or reverse mount starter allowed, must directly engage flywheel.
Automatic:
Must remain in OEM or OEM replacement case, with a
functioning OEM appearing pump. Aluminum OEM bellhousing may be
replaced with aftermarket explosion-proof aluminum bellhousing.
Original OEM bellhousing must have approved scattershield
constructed of minimum .125-inch by three-inch steel, 270 degrees
around flexplate.
Aftermarket
Manual: Must be IMCA approved, aluminum case, with
internal clutch. Must bolt to explosion-proof steel bellhousing, and
use full, steel, unaltered OEM or OEM replacement flexplate with
starter mounted in OEM location. No coatings or paint allowed on
transmission case.
Drive Shaft:
Minimum two inch diameter steel drive shaft and must be painted
white. Steel slip-yokes only. 360-degree drive shaft loop required
and must be constructed of at least .25 inch by two inch steel, or
one inch tubing, mounted six inches back from front U-joint.
23. ENGINE COMPARTMENT:
Rear of engine (bellhousing flange) must be mounted at least 72
inches forward from centerline of rear axle. Engine offset must be
kept within two inches of centerline of front crossmember with
engine level. Minimum 11 inch engine height from ground to center of
crankshaft. Radiator must be mounted in front of engine. Cooling
system may be modified. Overflow tubes must be directed to ground
between frame rails.
24. ENGINE SPECIFICATIONS:
Any American make engine allowed. Steel heads, block and oil pan
only. OEM passenger vehicle production block only. No GM Bowtie,
Ford SVO or Chrysler W blocks. Flat tappet cam/lifters and
stud-mounted rocker arms only. No stud girdles. No mushroom lifters,
cannot alter lifter bores. OEM firing order cannot be changed. No
crank triggers. All engines must be able to be used in
conventional passenger car without alterations. Engine mounts cannot
be removed or altered. Castings and fittings must not be changed. No
machine work on outside of engine. All belt driven accessories
must be on front of engine. ‘Wet’ sump oiling system only.
External oil pumps go with engine if claimed.
25. ENGINE CLAIMING RULES:
Refer to 2007 Official Rule Book for claim
eligibility requirements.
(A)
$525 cash, or $50 and exchange, claim on engine, flywheel and
balancing plates ($25 of this goes to wrecker for pulling each
engine). Claimed driver has option of accepting cash, or exchanging
engines with claiming driver.
(B)
Claim does not include - 1. clutch, 2. pressure plate, 3.
bellhousing, 4. headers, 5. carburetor, 6. starter, 7. motor mounts,
8. oil/temp. sending units, 9. carburetor spacer, 10. fan and
pulleys, 11. clutch ball, 12. clutch arm, 13. throw out bearing, 14.
dip stick, 15. water pump, 16. fuel pump, rod and plate, 17.
distributor, 18. plug wires, 19. water outlet and restrictor, 20.
breathers.
26. POINT
STRUCTURE/PROCEDURES: Refer to Official 2007 IMCA
Rule Book or www.imca.com.
27. EIRI:
(Except in rare instances) Decisions of IMCA Officials are final and
binding without exception. In some cases, track safety rules may
take precedence over IMCA rules - any discrepancy between IMCA and
track rules should be brought to the attention of IMCA. Any rule
changes or clarifications during the course of the year will be
published in Inside IMCA,
the official newsletter of IMCA, and will be considered as an
official part of these rules.
