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2015 Midwest Mods Rules



If you have won 4 or more races in 2014 or a Championship in any class 2014 or previous seasons,
you must move up out of the entry level classes for 2015 season.

FRAMES

Factory production complete full American passenger frames only. Frame rails must extend to a point beyond the base of driverís seat. Rear clip may be fabricated out of tubing. Front and rear pick-up loop required; otherwise bumpers or other pick-up point will be used.

BODIES

SEE IMCA NORTHERN SPORT MODS for rear sail panel rules. Exceptions: no spoilers, no spoiler sides, no nose wings.

RULE CLARIFICATION:

Bodies : The right side passenger side of the car the tire should be the widest point of the car, the body should not extend out past the tire. The left side drivers side of the car the body may extend 1? past the tire. Rear Sail Panels: MUST MEET IMCA NORTHERN SPORT MOD RULES.

WHEEL BASE

108 inches. minimum, 112 inches maximum both sides.

ROLL CAGE

Must consist of continuous hoops not less than one and one-half inches outside diameter and must have a wall thickness of at least .095 inch. Must be frame mounted in at least six (6) places. Body mounted roll cages not acceptable. Must consist of configuration of front and rear hoops connected by tubing on sides or side hoops in a manner deemed acceptable by the inspector. Driverís head must not protrude above cage with helmet on while strapped in driverís seat. Roll cage must have a 3/16-inch inspection hole in non-critical area. Must have at least three (3) horizontal bars at driverís door welded to front and rear of roll cage members.

WEIGHT

Minimum weight is 2500 pounds with driver after race ,No tolerance. All lead weight must be mounted securley, with 2 weight clamps & 1/2 inch bolts. Lead must be painted white & have your car number on the lead.

WHEELS

Wheel width must not exceed eight (8) inches. No aluminum wheels. Bead locks allowed on right rear only. Wheel discs (Mud Plugs) allowed but must be bolted or welded or foam type. No ZUS fasteners.

TIRES

American Racer kk704 tires only. Maximum tire width of nine (9) inches mounted on a conventional one-piece steel wheel with a maximum width of eight (8) inches. Tires maybe re-grooved.

BRAKES

Disc or drum brakes may be used front and rear. No aluminum disc or brake calipers allowed. Brakes must be operational on all four (4) wheels and must lock up all four wheels during inspection.

ENGINE LOCATION

Rear of engine (bellhousing flange) must be at least 72 inches forward from the centerline of the rear axle. The center of the crankshaft must be within two and one-half (2 1/2) inches of centerline of the ball joints.

ENGINE

MAXIMUM Size of engine block:
350 gm .060 max.
351 windsor ford .060 max.
360 chry. .060 max
Harmonic balancer on G.M.min.8 in
Smaller engine allowed no stroker engines allowed !!!!!!!!!
OEM firing orders cannot be changed

Ignition: MSD Rev box allowed 6200 RPM Max.

Heads

76 c.c. min.,stock , no performance heads (no double humps ,no292,041 castings ,, no lt1., no bowtie , no center bolt valve cover , or aftermarket allowed.) No porting or polishing, no screw in studs with shoulder, no guide plates, 194/160 valves max. no 202/160 allowed. 305 heads on 305 only!!!!!!

Camshaft

Hydraulic camshafts only &must pull at least 14-17 inches of vacuum at 1000 rpm. no tolerance. Hyd. Cam 430 maximum lift at valve, stock 1.5 ratio rockers only no tolerance. No polylocks, No roller cams, no roller tip or roller rockers allowed.

Crankshaft and Rods

Stock appearing, no light weight no h- beam rods .Press fit rods only, No floating rods,5.7 rod on G.M.max.

Pistons

Flat top 4 valve relief only Hypereutectic 4 valve relief pistons ok. no je ross or etc. No high performance parts allowed.

Aftermarket eagle scat, ect. Stock type ok No lightening of any kind to crankshaft 3.48 stroke max. Intake manifold-, only intakes allowed ,gm2101, ford 2121 or 2181, chrysler2176 or 3776 / intake must be unaltered.

FUEL SYSTEMS

Gasoline only. No oxygen bearing additives. No pressurized fuel systems. Fuel cells mandatory. Fuel cells must be encased in an approved metal container of no less than 20-gauge steel or 1/8 inch aluminum. Fuel cells must be mounted between frame rails as far forward as possible and using four, two (2) inch by 1/8 inch metal straps, two in each direction. Bumper must be equipped with a drag loop extending below bottom of the cell. Fuel cells must not extend below the rear end housing. 32 gal. maximum. smaller cell recommended New style screw on fuel cell cap with roll over flap recommended. No electric fuel pumps.

TRACK HAS OPTION TO ENFORCE THESE RESTRICTIONS WITH A CUBIC INCH PUMP GAUGE OR BY VISIBLY CHECKING PARTS AND PART NUMBERS. DISQUALIFICATION AND LOSS OF POINTS IF FOUND ILLEGAL.

CARBURETOR

4412 HOLLEY NO MODIFACTIONS. EXCEPT JETS AND REMOVED / NOT CHOKE TOWER. CARB. IS SUBJECT TO CLAIM BY ANY DRIVER IN A FEATURE IN LEAD LAP. CLAIM IS 250 DOLLARS OUTRIGHT OR 175 DOLLARS EXCHANGE. FAILURE TO SELL / POINTS AND FINISH FOR THE NIGHT , 2WEEKS SUSP. ,AND 50 DOLLAR FINE PAID TO CHARITY OF RACERS CHOICE BEFORE RETURNING TO RACING/ NO ELECTRIC FUEL PUMPS / MANUEL ONLY. SPACER PLATE FOR CARB. FROM INTAKE TO CARB. ONLY/ CLAIM $25 OUTRIGHT /$15 EXCHANGE.

OIL PANS

Extra capacity oil pans are permitted. No dry sumps allowed. Oil pump must mount in stock position. MUST HAVE 1 INCH INSPECTOIN HOLE ABOVE OIL LEVELFOR INSPECTION.Inspection Hole needs to be installed in a manner were tech official can see crankshaft & rods for proper inspection.If not pan will be removed for inspection.

STARTER

Engine must have working starter and must be capable of starting car on demand.

TRANSMISSION:

Option 1 - All forward and reverse gears must be operational, plus a neutral position. With engine running and car in still position, driver must be able to engage car in gear and move forward, then backward. Only OEM production transmissions allowed. No 'in and out' boxes or quick-change devices allowed. Functioning shift levers must be in OEM location. One steel or aluminum OEM style/size flywheel allowed, must be bolted directly to end of crankshaft.10.4 IN MIN. CLUTCH STOCK APPEARING PRESSURE PLATE 17 lbs.. MIN.STOCK SPRING TYPE DISC NO SOLID HUB. FLYWHEEL 15 LBS. MIN.: Must be unaltered three or four speed in OEM production case. No five (or more) speeds allowed. Must have working clutch inside explosion-proof steel bell housing with one hole for throw out bearing lever or hose, must be 270 degrees around top of clutch and flywheel area ,NO MINI-CLUTCH ALLOWED. Components must rotate, consistent with engine rpm, while car is in any gear. No Bert, Brinn, or Falcon type transmissions allowed.

Option 2 - Stock automatic transmission with full size working torque convertor.

No Power Glides,3 Spd Automatics only no TCI CNR, ETC. TYPE TORQUE CONVERTORS Mandatory must have approved scattershield constructed of minimum 0.125 inch by three inch steel, 270 degrees around flexplate. Only external lines allowed are for transmission cooler.

Claim on torque convertors $75.00

EXHAUST

Any collector type header allowed. Exhaust must be directed away from areas of possible fuel spillage. No zoomies. No step down or y type headers.

GAUGES/ELECTRONICS

12-volt ignition system only. HEI distributor only. OEM firing order cannot be changed. Ignition rotor, cap, coil and module must remain OEM appearing. No ignition boxes, remote coil or accessories. All wiring must be visible for inspection. Only gauges allowed are analog oil pressure and water temperature and analog tachometer (memory recall allowed). No electronic traction control allowed.

SHOCKS

One steel, nonadjustable, unaltered shock per wheel only. All shock mounts, including screw jack type, must be welded. No external or internal bumpers or stops. No coil over, air, or remote reservoir shocks. No Schrader valves or bladder type valve allowed. Front half of any shock may be shielded. One or all shocks may be claimed per event for $75 each.

FRONT SUSPENSION

FRONT SUSPENSION MUST MATCH FRAME AND BE IN STOCK LOCATION. PARTS MUST BE REPLACEABLE FROM STOCK OEM TYPE PARTS FROM SAME TYPE SUSPENSION EXCEPT UPPER A-FRAME AND A-FRAME MOUNT. TUBE TYPE UPPER A-FRAME MAY BE USED. FABRICATED A-FRAME MOUNT MAY BE USED BUT MUST BE IN STOCK LOCATION. LOWER AFTERMARKET A-FRAME CAN BE USED BUT MUST BE IN STOCK LOCATION. NO FABRICATED SPINDLES. ADJUSTABLE STRUT BARS CAN BE USED ON FRONT END ONLY. NO COIL OVER SHOCKS ALLOWED EITHER FRONT OR REAR. ONE SHOCK PER WHEEL.YOU MAY NOT RUN A DAMPENING SHOCK ABOVE THE REAREND. STEERING BOX MUST BE STOCK OEM TYPE AND BE IN STOCK LOCATION. NO RACK AND PINION STEERING. NO CENTER STEERING. ADJUSTABLE SWAY BARS ALLOWED.

REAR SUSPENSION

TWO OPTIONS: AFTERMARKET THREE LINK DESIGN OR MULTI-LEAF SPRING DESIGN. ALL COMPONENTS MUST BE STEEL. ALL MOUNTS AND BRACKETS MUST BE WELDED OR BOLTED SOLID.YOU MAY NOT RUN A DAMPENING SHOCK ABOVE THE REAREND.

A). THREE LINK DESIGN REQUIREMENTS: MUST USE MINIMUM 16 INCH CENTER TO CENTER OF HEIMS LOWER TRAILING ARMS BOTH SIDES NEEDS TO BE THE SAME, (1/2 INCH TOLERANCE ), NO SWING ARMS. SOLID PULLBARS ARE REQUIRED, NO SPRING BARS, RUBBER BUSHINGS OR ANY TYPE OF TORQUE DEVISE.PULLBAR MUST BE MOUNTED SOLID ( NO RUBBER OR ANY TYPE OF CUSHION IN THE MOUNTING BRACKET) MUST BE LOCATED AT TOP CENTER OF REAR END HOUSING AND REMAIN CENTERED ON HOUSING OVER DRIVE SHAFT(1INCH TOLERENCE LEFT TO RIGHT). MAY USE MINIMUM 23 INCH LONG PANHARD BAR LOCATED BEHIND REAR END HOUSING OR MINIMUM 19 INCH LONG J-BAR MOUNTED TO A STEEL PINION BRACKET. MEASUREMENTS ARE FROM CENTER OF HEIM JOINT TO CENTER OF HEIM JOINT. MAY MOUNT REAR SPRING DIRECTLY OVER AXLE HOUSING OR USE COIL COVER ELIMINATORS (SLIDERS). LOWER SPRING PERCH OR COIL COVER MOUNT MUST BE WELDED TO REAR END HOUSING. NO BIRDCAGES OR FLOATING MOUNTS ALLOWED. MUST USE STEEL UPPER WEIGHT JACK IF SPRING ARE MOUNTED OVER AXLE HOUSING. NO SHOCK TYPE ELIMINATORS.

DIFFERENTIAL/REAR END

Any passenger car type or truck rear end may be used. No aluminum.Full spools permitted. No quick-change devices allowed. Floater rear ends are allowed.

REAR END

Any steel approved OEM passenger car or truck non-cambered rear end allowed, must be centered in chassis. All components must be steel, except lowering blocks, axle cap, and drive flange. Safety hubs (floater) allowed. No quick-change devices. Inspection hole in housing required. Mini-spools only. Ring gear, center section and yoke cannot be lightened. Solid steel axles and one piece drive flanges only.

DRIVE SHAFT

Minimum two-inch diameter, white, steel drive shaft. 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.

BATTERY

All batteries must be mounted in a safe manner.Top of battery must be covered.

BUMPERS

Bumpers must be used front and rear. Front bumper must be mounted on frame end and be of a semicircle configuration with the bottom loop parallel to the ground. Front bumper must be ten (10) inches high from bottom bar to top of top bar. Material must be one and one-quarter inch minimum, two-inch maximum O.D. steel pipe. Rear bumpers may be constructed of pipe, square tubing, but must not have sharp edges. Rear bumpers and nerf bars must not extend beyond width of rear tire. Bumpers must be able to support car when lifted by wrecker.

SEAT AND SEAT BELTS

Racing seat mandatory. All cars must be equipped with an approved quick release type seat belt and shoulder harness securely fastened to frame and roll cage. Seat belt material should be at least three (3) inches wide AND CANNOT BE OLDER THAN 2 YEARS. Seat and steering wheel may be located to suit driver's taste, but must be kept on left side of car. No center steer.

HELMETS & FIRE SUITS

Helmets are required and must be worn at all times car is on the track. All drivers must wear fire suits of a flame-retardant nature. Two-piece suits are allowed. Fire resistant gloves are mandatory. Fire resistant boots are highly recommended.

KILL SWITCH, FIRE EXTINGUISHER, WINDOW NET

A kill switch is required within easy reach of the driver. This switch must be clearly marked OFF and ON. Weights and/or loose objects are not allowed in the driver's compartment. All cars must be equipped with quick release type window net on driver's door. No rear view mirrors of any kind. No radio communication or sound equipment of any kind.

FOR MORE INFORMATION, PLEASE CONTACT: Dan Osborn 417-664-4713.






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