YELLOWHEAD INTERNATIONAL SPEEDWAY
DEMO DERBY RULES
1. Imperials, hearses, ambulances, convertibles, or T-tops.
2. Foul language on car.
3. Home-made bumpers
Items that MUST be removed:
-air conditioner must be discharged
Building a Safe Competitive Car:
1. The tech judge’s decisions will be final.
2. There will be no welding on the car EXCEPT where specified – even as a field repair.
3. There will be no reinforcement EXCEPT where specified.
4. If it does not say it is allowed, then it is NOT allowed.
5. All vehicles will be checked for working brakes (**You must be able to stop the car**).
6. Mandatory seat belt – Lap belt is the minimum requirement, MUST be in good shape.
NO BURNS, RIPS, BUCKLE MUST WORK etc…
Engines, Transmissions, and Differentials:
1. May be interchanged, but must remain in the stock position and true to manufacturer (GM to GM, Ford to Ford, etc.)
2. Motor mounts and transmission mounts may be chained or welded to frame.
3. Shifter type optional.
4. Differential may be locked or welded.
5. Cutting out of firewall for distributor clearance is allowed. MAX 10” x 10” Hole. MUST be covered with a heavy rubber mat, MINIMUM.
6. Transmission cooler optional. MUST be mounted under the hood, in front or behind the rad or behind the driver in back seat area. Securely fastened with approved steel lines and adequate drain holes in floor. Driver must be protected from spraying of hot oil in case of breakage.
7. End of dipstick tube MUST be sealed. Optional ¾” hose on transmission dipstick.
8. Slider drive shafts optional.
9. NO Engine cradles, engine braces or distributor guards allowed!
Steering and Suspension:
1. You can put spacers in sagging coil springs to get your height.
2. You can wire or weld coil springs to rear-end housing only to prevent springs from falling out.
3. Leaf springs must be stock and if clamped only 2 per side for a total of 4 clamps on both springs.
4. Clamping or stuffing of shocks allowed.
Paint and Body:
1. Driver’s door MUST be painted white.
2. No profanity as decoration or advertising.
3. If two cars are entered the paint jobs must be visibly different (cars must be easily differentiated). Roof signs are acceptable, but MUST be bolted securely.
4. Factory body mounts only, no modifications. EXCEPT for ready rod placement.
5. Roll cage is optional, must not be attached to frame or reinforcing the structure of the car. For personal safety only.
6. Roll over hoops allowed, must not be attached to frame or reinforcing the structure of the car. For personal safety only.
Doors and Door Reinforcements:
1. Doors may be chained, or bolted shut.
2. Welding of the doors is permitted, stitch weld maximum of 6, 3” welds per door.
3. Optional Driver’s Door can have a door bar bolted at medium height with minimum three ¾” bolts. This door bar must be a minimum 6” C-channel, maximum length of bar, 6’6”.
4. Passenger’s Door may also be fitted with a door bar the same way
5 .Optional- Dash bar extending door to door above steering column, must be bolted with ¾” bolts or larger with steel plates on outside of the door C channel.
5. MANDATORY- Roll over bar from the floor to the top of the roof supporting the driver’s
seat must be bolted with a minimum of 4 bolts top and bottom and MUST be padded- in case of rollover.
1. Must have a hood and a trunk.
2. Trunk tucking and creasing allowed.
3. Hood must have a large enough hole suitable for fire extinguishing.
4. Hoods and trunks must be chained or bolted with ready rod. The hood may have up to 4 ready rods, 2 through the frame and 2 through the body using large washer plates that do not exceed 6” in diameter. The trunk can have up to 4 ready rods, 2 through the body and 2 through the frame.
5. Welding of the trunk is permitted, stitch weld maximum of 8-3” welds
6. No bolts allowed ahead of the front rad support.
7. Maximum bolt head size 1 ¼”; minimum bolt head size ¾”.
1. Must remain stock. If rad is run, must be wired or bolted in stock location.
2. Anti-freeze MUST be drained and filled with water only.
3. Fan type optional. No metal flex fans allowed.
4. Home-made radiators allowed.
5. Hose looping allowed, MUST remain under the hood.
Air Intake and Exhaust System:
1. Must have an air cleaner assembly with a filter element to act as a flame arrestor.
2. Exhaust must exit the engine compartment through the hood or out the bottom – manifolds alone are NOT enough.
1. May be interchanged from year to year, model to model, but MUST be stock to manufacturer (GM to GM, Ford to Ford, etc.).
2. Maximum 3/16” flat iron plates allowed to hold bumpers on.
3. Bumpers may be trimmed or inverted.
4. Bumpers may be welded to bumper brackets and bumper brackets to frame. NO other reinforcements allowed
7. No truck bumpers or home-made bumpers.
8. “Hard Nosing” Allowed.
Tires and Rims:
1. Any size rim that fits the bolt pattern.
2. NO WELDING ON RIM, Except for valve stem protector.
2. NO split rims are allowed.
3. Valve stem protectors and tubes are acceptable.
4. Maximum tire height is 31”.10 ply max
5. No studded tires or tractor tires
6. No sand or directional tires.
7. Air only in tires. NO additives, liquids, solids, or fillers.
8. Wheel wells may be trimmed and bolted for clearance with a maximum of 4 bolts no bigger than 1 inch
9. ALL wheel weights MUST be removed from BOTH sides of wheel!
1. Must be mounted securely in a metal or plastic marine style box with bolts, nuts and washers.
2. Must have a secure lid or cover to protect from explosion or leaks.
3. 24 volt system allowed.
4. 2 batteries MAXIMUM!
1. Fuel leaks or potential leaks will NOT be tolerated.
2. Fuel tank can be boat, snowmobile, or fuel cell and must be located in the rear seat area of the car, securely mounted with nuts, bolts, washers, metal straps, or ratchet straps. NO screws or bungee cords.
3. Home-made fuel cells allowed, must be well built. (e.x Propane tank.) Subject to tech approval. Anything deemed “unsafe” will NOT be allowed to run.
4. A hole/holes must be cut in the floor near, around or under the tank for drainage.
5. MUST have floor pan plugs removed.
6. Fuel lines entering through the firewall into the passenger compartment must be approved. Metal lines securely fastened with short rubber connections are acceptable.