2008 IMCA Modified Rules for weekly Division run at Bear Ridge Speedway
The rules and/or regulations set forth herein are designed to
provide for the orderly conduct of racing events and to establish minimum
acceptable requirements for such events. These rules shall govern the condition
of all events, and by participating in these events, all participants are deemed
to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY
SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND/OR
REGULATIONS. They are intended as a guide for the conduct of the sport and are
in no way a guarantee against injury or death to a participant, spectator or
official.
The race director shall be empowered to permit reasonable and appropriate
deviation from any of the specifications herein or impose any further
restrictions that in his opinion do not alter the minimum acceptable
requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH
ALTERATION OF SPECIFICATIONS. Any interpretation or deviation of these rules is
left to the discretion of the officials. Their decision is final.
Revised November 2007. Revisions/clarifications are underlined,
recommendations are italicized.
MODIFIED RULES - 2008
1. SAFETY EQUIPMENT:
Rules apply at all times car is on track. Snell-rated SA2000 or SA2005 helmet
required. (Effective January 1, 2008, SA95 helmets are no longer allowed).
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 inch by 20 inch ribbon or mesh
style, and must be mounted so latch is at top front of window. Minimum three
inch wide SFI-approved 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
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 minimum wall
thickness of 0.095 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. with 0.083 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. with 0.083 inch wall thickness, and one top door bar, minimum 1.5 inch
O.D. with 0.083 inch wall thickness. Steel door plate, 18 gauge or 0.049 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)
No composite body panels allowed except roof rock guard and hood scoop.
Body must be same width, front to rear, and parallel to OEM frame. Minimum
ground clearance is four inches. 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. Maximum 1.5 inch rolled down rock guard allowed on roof front.
No fins, lips, 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 0.125 inch aluminum, or 0.060 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 0.625 inch steel rod end and steel tube; spindles can be ground for
brake caliper clearance only; unaltered, OEM replacement Pinto spindles with
‘IMCA’ raised cast; bolt on spindle savers allowed; steel steering shafts and
knuckles only; driver compartment steering may be modified, must be kept on left
side. Spindles must be right and left, and of same design. Quick release
required - steering quickener and steering wheel may be aluminum. 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 bladder type valve allowed.
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,
air bags or inner liners.
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. Solid safety chains,
cables or tethers permitted frame to axle housing only (cannot be mounted to
bird cage), no springs, rubbers or adjusting devices on/or attached to system.
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.
Rear bumper must be constructed of solid square, or minimum 1.25 inch
O.D. tubing with 0.095 wall thickness, and – similar to diagram - no wider than
five inches outside of rear frame rails. If wider than five inches outside rear
frame rails, must be capped and bent forward 90 degrees, or constructed in a
loop design. Must have at least one upright, minimum 1.25 inch with 0.065 wall
thickness, from bumper to fuel cell guard.
Two-bar front bumper must be minimum 1.25 inch O.D. tubing with minimum
0.065 wall thickness (maximum 0.095 inch) 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 cover allowed on right rear
only. Inner mud cover allowed on left 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 0.81 inch
thickness (new). Vented rotors only, no scalloped or ceramic coated
rotors. No brake shut-off or pressure sensitive devices. One front to rear
proportioning device allowed. 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 merge collectors. 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 20
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 0.125 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. If fuel cell does not have
aircraft style positive seal filler neck/cap system - a flapper, spring or ball
type filler rollover valve is required. 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, above interior deck 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 0.5 inch bolts.
No titanium, magnesium or carbon fiber products. Only carbon fiber components
allowed are rock guard and hood scoop. 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 unapproved cameras, 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 0.125-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 0.25 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 2008 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 2008 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 amended at www.imca.com as well as published in Inside IMCA, the
official newsletter of IMCA, and will be considered as an official part of these
rules.
AT ANYTIME IN FAIRNESS TO COMPETITORS WEIGHT MAY BE ADDED AND/OR RESTRICTOR PLATE USAGE REQUIRED. DISCRETION OF TRACK OFFICIAL(S)
INTERPRETATION OF RULES BY AN OFFICIAL IS FINAL. THE MANAGEMENT RESERVES THE RIGHT TO CHANGE ANY RULE OR RULES IF THEY FEEL IT IS NECESSARY, AND REFUSE ANY PROTEST IF THEY FEEL IT IS UNNECESSARY AND BEING USED FOR HARASSING REASONS. ALL FINES AND/OR SUSPENSIONS WILL BE IN EFFECT AT ALL BEAR RIDGE SPEEDWAY EVENTS.
THE INTERPRETATION AND INVOKING OF THE RULES PUBLISHED HERIN SHALL BE DETERMINED BY BEAR RIDGE SPEEDWAY OFFICIALS ONLY IN THEIR PROFESSIONAL DISCRETION.
BEAR RIDGE SPEEDWAY INC.
OWNED AND OPERATED BY
C.V. ELMS III
APRIL MAY PRESTON
HOME 603/787-6352
FAX 603/787-2490
TRACK PHONE
802/222-4052