![]() ![]() ![]() No other wires may be attached to any of the MSD factory wires other than as specified per MSDs wiring diagram.Ħ) All tractors must have a Datalog RPM Plug Kit P/N – 3316. If factory sealant/ sticker is broken, a new box is mandatory.ĥ) Only the wiring per MSDs wiring diagram is allowed, and must be plainly visible. If you drill a rivet out, you will have to buy a new box. (2020 Rule Change)ġ) Tractor engines will have an 8000 maximum RPM limit.Ģ) Tractors must use an MSD model 6AL or 7AL-2 system with chip limiter.ģ) Boxes must be easily accessible for officials to tech.Ĥ) Boxes may not be tampered/ modified. Tech inspections performed by using MSD model 89952 RPM Module/Chip Tester and/or Datalog Peak Performance recorder P/N – 2347. IGNITION: All ignitions must use an MSD model 6AL or 7AL-2 system with an RPM limiting chip. Headers must exit in an upward direction. No tunnel-ram, no sheet metal/ aluminum intakes, no casted sheet metal type, no welded manifolds allowed. All intake manifolds can be low-rise type. Carburetor will be inspected with a No Go gauge (1.400 top and 1.700 bottom. No fuel injection, no throttle based injection. No predators, no dominators, no aerosol carburetors. MANIFOLD, CARBURETOR: One four barrel naturally aspirated carburetor, 4150 base, 750 CFM. Center of axle to rear of block (where bell housing bolts on) is to be a maximum of 72 inches The (Engine Rule) will be in effect through the pulling year 2020. All engines may be subject to a tear down by the COTPA Tech Inspector and or COTPA Officials as they deem necessary. The (Pump) is a Tech tool only engines under protest may be subject to a tear down. Must be a cast iron block, cast iron heads, maximum eight cylinders, two valves, one spark plug per cylinder, Camshaft in block. No clevis, absolutely no turnbuckles.ĮNGINE RULE: Must be 410 cubic inches or smaller, 6 cubic inches may be added to engines that require a fresh re-bore, no engine may be larger than 416 +0 cubic inches, Must be an industry standard small block, no big blocks. Drawbars must be stationary in all directions. No part of drawbar is to be attached to any point higher than the center of rear axle. No part of draw bar may extend rearward beyond point of hook. (2020 Rule Change)ĭRAW BAR: Drawbars must not exceed 20 inches in height or less than 18 inches from center of axle to hooking point. Racecar gasoline, and oxygenated fuels may be used with a specific gravity (sg) not to exceed. AGE OF DRIVER: 16 years or older, under 18 years must have parental consent.ĪGE OF TRACTOR: 1972 and older, no home- made tractorsįUEL: No pressurized fuels, no nitrous oxide, no nitrogen methanol, no methanol, and no propylene oxide. ![]()
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