FULLSIZE HEAT RULES
Midwest Demolition Derby Association Inc.

Fullsize Heat Car Rules

New rules that were added for the 2014 season are as follows.

Weld-in centers are allowed but must measure no more than seven inches across.

You can run 1 inch threaded rod at the core support only and must be attached through or to the frame and maybe be welded to the frame but may not wrap around the corner of the frame.

Limit of four turn in spacers per coil.


These rules apply to all events with the Midwest Demolition Derby Association Inc. rules can’t be reproduced without their consent. All rules must be read and followed by all drivers, pit crew, promoters, judges, wrecker crew and any person taking part in the derby. Any violation of these rules may disqualify the individual from further participation in the derby.

All cars must be at the derby site at least ONE HOUR prior to the advertised start time of the derby! Failure to do so might result in not being able to run, if we don’t have time to tech your car in. No car will be allowed into pit area till it passes inspection. All contact will be on a two minute time limit and contact counts as follows aggressive hits only. Contact will be in judges discrection.

These rules will be enforced at all association derbies, there will not be a meeting with drivers to discuss anything, This is your warning for drivers side door hits, there will be a warning at he drivers meeting prior to the derby, and that is if you hit someone intentionally in the derby and you will be flagged out. Same goes for anyone putting their door in line of being hit.


Section (A) General Car Rules:

A-1 Any year, make or model car maybe used except convertibles and all wheel drives. Frame & suspension must be same year, make, and model as body. Any steering sector may be used. 03 and newer must run with factory cradles and steering. No imperial sub swapping allowed must be an imperial car.

A-2 No additional layering, bracing, bolting, welding, wiring, chaining, etc., of any form may be done to any part of the car other than as specifically outlined in these rules.

Pre-run cars should call before they get fixed, one time fix per car. Cars can have 36 spuare inches of 1/8 thick plate per corner of the car, but only maybe on one side of the frame not wrapping around the corner of the frame. There will be NO plating in the pits after heats or consi’s any more.

A-3 All carpet, cloth, plastic, glass headlights, tailgates, grilles, mirrors, chrome, and other such trim must be stripped from inside and outside of the car. This includes third row seats and/or compartment covers in wagons. Interior and trunk must be clean of al broken glass, loose screws, cans, ect. EXCEPTION; Driver’s door panel, kick panel, and b-pillar cover may be left in to protect driver from sharp edges underneath. Foam pads may be added around diver.

A-4 Batteries must be removed and placed within the drivers compartment of the car. It is required that they be safely secured and COVERED. This includes securely bolted DOWN, not just secured side-to-side. Battery boxes must be made out of metal and secured to the floor with bolts.

A-5 Cooling systems must remain in the stock location in the radiator support (radiator/ ready barrels or roof barrels) ONLY BEING BOLTED IN WITH FOUR 3/8 bolts with three inch washers maybe used no second guessing. Water or antifreeze only. Radiator overflow hoses must vent down, preferably under the car, at least under the hood. Spray foam may be used to secure radiator, but may not be used anywhere else. Roof mounted barrels must vent under car. If using a roof mounted barrel it must be securely mounted with no more than ¾ inch bolts, the car MUST have a brace from the floor or door bar to the roof near the driver. Barrels must be well-built and made of metal only. No engine oil coolers. Transmission coolers allowed. Fan blades may be altered or removed. Electric fans are okay.

A-6 Trunk lid/tailgate maybe be secured using either wire, chain, 3/8” bolts w/max 3” washers or 5”x5”plates. Six (6) attachment points maximum (hinges/latches do not count as points). Trunk lid/tailgate cannot be attached to the trunk floor or frame and must be mounted in the stock location.

A-7 Doors must be secured using wire, chain or 5”x 5” plates max. Six (6) attachment points maximum (hinges/latches do not count). The drivers door maybe welded solid and the rear door following the drivers door may have four additional attachment points if the drivers door is welded solid. Chains/wires for the doors may be through the roof or around the frame. Hardtops will be allowed to create a single post of chain/wire from the top of the door to the roof on the passenger side. This will not count as one of the locations for the door(s). On the drivers’ side you may weld in a 2” diameter pipe or strap n the same manner.

A-8 HOODS MUST BE OFF OR FULLY OPEN FOR INSPECTION. Car will not be teched with the hood in place. Hood must be secured with hood pins, chain or wire or angle iron welded on fender and hood of car not exceeding six inches in length with one bolt bolting the iron together. Six (6) attachment points maximum (hinges do not count as an attachment point). Hood pins may be made of bolts or pins, no more than 3/4” diameter. The front two body mounts may be removed and 1” threaded rod may be used and ran through the frame or along side of the frame being welded to the frame but may not wrap around the corner of the frame. All other attachment points may NOT attach to the frame in anyway. No chain or wire in front of the radiator. Hoods must be cut open in a manner to allow easy access for fire extinguishing. Hood MUST be mounted in the stock location. The excess of the hood maybe folded over the front of the car, but NOT attached to any thing. All washers for hood pins limited to 5”x 5” plates. Also may run two loops of nine wire from hood pins to the front bumper.

A-9 Cars must have working brakes capable of stopping the car at the beginning of each heat. If a car loses brakes during the heat it may be DQ’d.

A-10 Any air filled tire is allowed except; studded tires and foam filled tires. Valve stem protectors and tire flaps are allowed. Spacers between lug nuts & rims are ok. 7 inch weld in centers are allowed.

A-11 Turn-out exhaust headers are allowed.

A-12 Driver Safety:

• Windshield(H) bars are allowed. Must be vertical with a maximum of two bars not exceeding 1 ½ square tube or flat stack. May be bolted or welded in place, but may not connect to or hold the hood in any way. Can only be connected to 3 inches of the roof. And may connect to the firewall, and to two spots to the dash bar.

• Back window bar may also be added, one bar from the top window seem not exceeding three inches passed the top window seem, and may be connected to the trunk deck not exceeding passed the trunk seem. Made of iron not exceeding in 3 inches in width and 2 inches thick.

• Window bars or nets are allowed on driver’s door. They may be welded or bolted in place and will not count towards an attachment point for the driver’s door (if welded to the rear door, count as an attachment point for the back door).

• Door bars are allowed. Pipe must be 2” to 4” in diameter, ¼” wall. End plates must be no more than 5”x 5”, ¼”thick. Bar may be welded, chained, or bolted in. If bolted in, exterior plates cannot exceed 5”x 5”. Two attachments per side and will not count as points for the door(s). Dash bar may not exceed 6 inches passed the front inside door seem and may not exceed 6 inches passed the rear door hinge for the rear door. The halo bar must be attached to the door bar and to the tin of the floor not connecting to the frame and also maybe bolted to the roof in two locations. Including both a straight across and a diagonal bar to the driver side rocker panel area is highly recommended. The diagonal helps prevent “blowing out” the driver’s side door pillar from a hard passenger hit.

• Dash bars are allowed. Same dimensions apply as specified for the door bar. Attach in a similar manner. Steering column may be supported by the dash bar (may chain to the dash bar)

• Drivers & Passenger door bars allowed. They are to connect from the seat bar to the dash bar. Same dimensions apply as specified for the dash/door bars.

• Door plate(s) allowed on drive’s door. May extend 4” past door seams. Must be flat plate; no I-beam or C-channel. No more than 8” total height (two 4” plates ok for example.) These do count as attachment points if welded to the fender/ rear door.

• Drivers must wear at a minimum of; blue jeans and a long sleeve shirt, fire suits recommended. Absolutely no sandals.

A-13 Gas tanks must be boat or race car type tank; must be made out of metal and placed inside the car and firmly secured with bolts, no ratchet or bungee straps. Original tank must be removed. No alcohol or methanol fuels allowed. Fuel injected cars with in-tank pumps must be a boughten tank no homemade tanks or you will NOT run.

A-14 Any make engine/ transmission allowed. Engine must remain in stock-style location forward of the original firewall. Mounts may be homemade and welded in, but may not protect any engine components. Straps may be made from ½” rod or 1”x ¼” square tube or flat stock. It must come straight sideways of the front of the cylinder head to the top inside corner of the frame. Strap and its weld may not overlap more than 1” of frame and may not cross a seam. If chaining, links may not be welded.

A-15 Any factory bumpers may be used on any car, but not be stuffed or holes in the front or the rear be welded shut. Bumper brackets must come from make of car. Ford car ford brackets NO interchanging of brackets allowed. Brackets or shocks must be welded on the inside of frame not exiting through the frame. Or they maybe welded on the out side of the frame. They also may NOT be welded on the top or bottom of the frame at all.

A-16 Any factory rear axle allowed but must be 4 or 5 lug car axle. Must be mounted in stock manner and location. Spider gears may be welded and lockers are allowed. Braced rearends and slider
driveshafts are allowed. NO reinforcing of control arms.

A-17 Suspension and frames must remain stock, unless noted otherwise. ALL body mounts except radiator support body mounts must remain stock. Bolts may be replaced, but only with 7/16” with 3” washers maximum. Rear ends may be chained with one(1) loop of chain per side and must go around the hump on the frame rail. Leaf spring cars must use stock amount of leafs and original thicknesses and mounting points. Leaf springs can have one homeade leaf clamp 2 inches in width 1/4 “ thick with a 3/8 bolt bolting the clamps together one in front of axle and one in rear of axle following same procedure for both sides and may also keep factory ones if they are good. No modification of trailing arms allowed and must be the stock arms. 4 Coil springs spacers per coil are allowed in front and rear of the cars. Coil springs may be wired either on the top or around the rear axle, but not BOTH. Y- framers may suck the (Y) together. No added metal and no welding on the bottom. You MUST leave space on bottom for inspection and can put the long frame bracket alongside of the frame or using shock horns in the inside of the frame but not both. You can only bend over the tab on top welding it without using any extra metal if the welder cant weld it then don’t weld it. Pinch frame cars may NOT bend over tops then weld it. But may weld both seams from back of A frame to front bumper. No double coil springs.

A-18 Welding from back of A-frame to the bumper is allowed only on top of frame. Not exceeding one inch in width.

A-19 Car numbers must be visible from both sides of the car, preferably on the front doors or on a roof plate.

A-20 When cold bending a car you may cold bend it and that is all. NO cutting boxes or strap.

A-21 When making a homemade tranny cross member you may only weld a six inch piece of angle iron ¼” thick by 3 inches on the frame.

A-22 You may use engine cradles but not tranny, pulley, carb, or distributor protectors. But ultra bells are allowed.
Address: 2500 Longspur Trail Mandan ND 58554

Mailing Address: PO Box 6272 Bismarck, ND 58506

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