CENTRAL OHIO TRACTOR PULLER ASSOCIATION

DIVISION 7 HOT ROD TRACTORS

SMALL BLOCK 2012 RULES

WEIGHT;  6000 #

TIRES; 18.4 x 38 maximum

AGE OF DRIVER;  16 years or older, under 18 years must have parental consent.

AGE OF TRACTOR;  1972 and older, no home made tractors

FUEL;  Gasoline fuels only with a maximum of 750 specific gravity, no E85, no alcohol, no pressurized fuels, no nitrous oxide, no oxygen accelerate, no nitrogen methanol, and no propylene oxide.  Racecar gasoline may be used.

DRAW BAR;  Drawbars must not exceed 20 inches in height or less than 18 inches from
center of axle to hooking point. No part of draw bar may extend rearward beyond point of hook.  No part of drawbar is to be attached to any point higher than the center of rear axle. Drawbars must be stationary in all directions. No clevis, absolutely no turnbuckles.

ENGINE RULE;  Must be 410 cubic inches or smaller, 6 cubic inches may be added to engines that require a fresh rebore,  no engine may be larger than 416 +0 cubic inches, Must be an industry standard “small block”, no big blocks. Must be a cast iron block, cast iron heads, maximum eight cylinders, two valves, one spark plug per cylinder, Camshaft in block. The (Pump) is a Tech tool only; engines under protest may be subject to a tear down. All Pullers have the tear down option. All engines over 410 cubic inches must be documented with the Tech Inspector and may be subject to a tear down by the COTPA Tech Inspector and or COTPA Officials as they deem necessary. The (Engine Rule) will be in affect through the pulling year 2014. Center of axle to rear of block (where bell housing bolts on) is to be a maximum of 72”

MANIFOLD, CARBURETOR; One four barrel naturally aspirated carburetor, stock, out of box 750 CFM.  No flowed carburetors, no predators, no dominators.  No fuel injection, no throttle based injection. No sheet metal intake manifolds allowed.  Headers or open exhaust are allowed.  Headers must exit in an upward direction.

IGNITION;  All ignitions must use a MSD system with an 8000 maximum rpm limiter chip.

HOOD, GRILL, TRANSMISSION, REAR END, AXLE; All Sheet metal to include Hood, Grill, Fuel Tank, (if part of sheet metal)  Side metal, and Screens must be for that make and model and must maintain original dimensions in all directions (width, height and depth) but could be moved forward a maximum of 8 inches as a complete unit/assembly. Sheet metal upgrades are allowed, but must not cross the original manufacturer’s lines. Some sheet metal modifications are allowed. All upgrades and modifications must come to the committee for approval.  Front ends may be homemade, maximum allowable wheelbase of 100” from center of rear axle to center of front axle. 

TOTAL LENGTH OF TRACTOR;  Maximum length 11’ from center of rear axle to the furthest point forward, including weights.

SAFETY EQUIPMENT;  Helmet and fire suit, wheelie bars, ski bars, kill switches, fire extinguishers, fenders, blow proof damper pulley and shroud, SFI flywheels and pressure plates, scatter blanket or SFI bell housings, engine side shields. Drive shaft from bell housing to transmission must be shielded.  Roll cages must be capable of supporting tractor and driver. No steel  fans. All tractors must have wide front axles with a minimum of 32 inches between inside of tires. All electric fuel pumps must be wired to the kill switch. All factory cast iron tub frames must be reinforced or replaced with steel where it bolts to the transmission.

Technical Inspections;    All Tractors must be pumped, pans sealed, and go through a complete Tech inspection prior to the summer season. There will also be random checks during the season.

Pre season inspections can be done at the Dekalb Pull at Eaton.

 ALL COTPA GENERAL RULES APPLY INCLUDING PROTEST POLICY

Hot Rod Committee Chairperson; Larry Mouser 937-441-1242       1-1-12