Afton Motorsports Park 4 Cylinder Truck Rules
The 4 cylinder truck rules for Afton Motorsports Park are listed on this and two other pages, linked to below.
4 CYLINDER TRUCK RULES - Page 1
Page 1 of Rules: [Eligible Trucks] [General Build]
[Chassis]
[Rollcage]
[Engine Location]
[Weight]
[Body]
Page 2 of Rules: [Go to page 2] Includes Engine, Fuel/Air, Ignition, Transmission, Fuel Cell, Exhaust, Cooling System and Batteries.
Page 3 of Rules: [Go to Page 3]Includes Rear End, Dirve Shaft, Brakes, Suspension, Steering, Tires and Wheels.
[PDF of 4 Cylinder Truck Rules] [Download Adobe Acrobat]
These rules are posted here as convenience only. Not responsible for any type-O's or other copying mistakes. Call the track office if you have any questions. Make sure you read all safety and procedural rules outlined in the rule book.
Eligible Trucks
- 2005 or older, 8 valve, single cam 4 cylinder trucks.
- Trucks must be non-turbo, open bed, rear wheel drive only.
- 4-wheel drive conversions may be used, but must be rear wheel drive only with no front driveshaft. You may remove transmission and transfer case replace with 2 wheel drive transmission.
- No SUV's
General Build Rules
- All interior must be gutted including upholstery and carpeting.
- May use OEM dashboard, or may replace it with a fabricated dash.
- Pedals must be in stock location with no extensions.
- May use aftermarket pedals.
- Aluminum high-back racing seat mandatory.
- Must be securely mounted to the frame/rollcage.
- Must use approved SFI rated 5 point racing harness, less than 5 years from manufacture date.
- Trucks must have approved window net with quick release latch.
- Windshield must be OEM Glass, Lexan, or wire mesh.
Chassis
- Must use stock frame in good condition only.
- Frame must be straight, sound, and complete.
- Cutting, chopping, or shortening of the frame is not allowed.
- Frame rails may be notched in the rear above rear end to allow for suspension travel.
- Must retain factory wheelbase for the truck being used.
- Minimum frame height of 5"*.
- *A-arms, leaf springs, rear axle, and front valiance do not have to meet this requirement.
- *This will be measured with fully suited driver strapped in the seat.
- Zero tolerance on ride height.
Rollcage
- 6 point rollcage mandatory.
- Minimum 1.5" 0D x .090 wall thickness minimum.
- Must be securely welded to frame.
- Driver and passenger side door must have a minimum 3 horizontal door bars.
- Passenger side door bars may utilize an "X" design with a horizontal bar at top and bottom of "X".
- All rollbars in reach of the driver must be padded.
Engine Location
- All trucks must maintain factory engine location.
- No moving mounts, lowering, or engine setback.
Weight
- Minimum weight is 2650# after the race.
- No rear weight %.
Body
- May repair/replace rust/damage with 20 guage sheetmetal. Any repairs must be done with pride.
- Any replacement body panels must have all factory body lines and must be factory dimension and location.
- Trucks must have either a full bed or "tonneau cover".
- Bed covers must be used if the bed has been gutted (no "open" beds).
- Bed covers must be solid (steel, aluminum, plastic, leather, etc.).
- Spoilers may be used, 5" tall surface area maximum.
- May use sideboards on spoiler, no more than 12" long, no taller than spoiler.
- May run aftermarket nose and tail piece.
- Cab must be intact and maintain stock dimensions, including stock floor pans and firewalls. May be cut for exhaust.
- No fiberglass body panels.