Rules & Regulations

P.O. Box 707, 601 Fairgrounds Road
Mt. Vernon, Ohio 43050
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Event Sponsor: Hughes Equipment

Saturday August 1, 2015 at 7:00 P.M. Knox County Mt. Vernon, Ohio
Chairman - Johnny Curtis & Dustin; All Board Directors

OSTPA Classes:
6500 Super Modified Four Wheel Drive Trucks
10,000 Pro-Stock Tractors
20,000 Pro-Stock Semis

1. No hood exhaust.
2. Must have bumper or reese style hitch.
3. Must have street tires/ no cut tires.
4. If dual tires/ must be factory duals no add-ons.
5. No weight brackets.
6. No intake enhancers, propane, water, alcohol, starting fluid or any type of fuel enhancers or cooling supplements.
7. Must have air filter.
8. All judge’s decisions are final. If cannot meet rules of this class you can pull in next class. One hook only in one of the three classes.

Class 2 7500lbs- 2.6 Diesel 4x4 Truck Rules
General Information
All trucks will be teched at each event.
Driver must wear a fire suit and a full-face helmet.
Vehicle must be equipped with guillotine/air shut off in front of the turbo.

Weight Breaks
2.6 Weight is with driver. Minimum weight of 7500 lbs.

Ballast is permitted. Front hanging weights are allowed, not to exceed 60 inches forward of center of the front
axle. This will be measured from center of front wheels to end of weight assembly. Ballast may be added in
the bed of the truck.

The body must be the OEM truck body, including the full bed floor. The body must retain full sheet metal, after-
market hoods are permitted. The hood much be closed and securely latched while the vehicle is hooked to the

Four-wheel hydraulic brakes are mandatory.

The OEM chassis is mandatory. The engine must be in the OEM location for the body used. The vehicle
must retain the full OEM chassis. Wheel tubs, back-half conversions, tube chassis, etc., are prohibited.

Cooling System:
Radiators must be in the stock location and be of at least stock size.

All drivers must have a valid state driver’s license.

An OEM transmission and transfer case are mandatory. They must have been an option on a one-ton or smaller

Driveshaft Loops:
All trucks must have at least six inch wide U-joint shields around the rear u-joint constructed of at least ¼ inch
steel or 3/8 inch aluminum that will safely contain the u-joint and the end of the rear shaft. All shields must be
securely mounted to the vehicle. Any front shaft u-joint that is visible from the side of the truck must be shielded
to contain the u-joint and the end of the shaft.

Driver Restraint System:
A restraint system is mandatory and must be worn.

The engine is limited to a stock-appearing engine and transmissions can be interchanged between Dodge, Ford
and GM as long as they came in a 1 ton truck or less from the factory. Complete engine must have stock
appearance except where otherwise noted in these rules. Aftermarket intake manifolds are allowed.

All vehicles must be equipped to direct exhaust upward. Two 3/8 inch diameter bolts must be placed through the
exhaust pipe in a cross pattern within one inch of each other, within 12’’ of the turbo.

Fire Extinguisher System:
A fire extinguisher system is permitted. It must be securely mounted.

The complete OEM firewall is mandatory.

The complete OEM floor pan is mandatory.

The fuel must be pump #1/#2 diesel, Soy/Biodiesel fuel. No propane or NO2 permitted or any other
oxygen enhancers. Hand throttles are allowed.
Fuel Injection Pump:
The fuel injection pump is limited to a stock-appearing, OEM engine model-specific pump only. The use of
multiple high-pressure common-rail fuel pumps is legal. Powerstroke engines with a single factory turbo may
utilize a second HPOP. Pumps from different years in the same engine model may be interchanged. P7100
pumps are allowed to run RSV (ag governors).

Fuel System:
Racing fuel cells are permitted.

Hook point must be no closer than 44” of centerline of rear axle, hitch height maximum of 26”, with a minimum
of a 3.75” X 3.0” opening. Hitch point must be easily accessed. No “trick” type hitches permitted. Hitch must
be stationary in all directions. Hitch must be frame mounted. Hitch must be mounted centerline of rear axle or
behind. Hitch must not exceed a maximum of 25 degree angle from pivot point to hook point.

Rear End:
Non-OEM rear-end housings are prohibited. It must have been an option on a one-ton or smaller pickup. Rear axle bolts must be covered by a cap or shield.

Hydraulic steering permitted.

Suspension, Front:
The upper mounting point for strut assemblies must be in the factory location. Adjustable caster/camber pillow
ball mounts are permitted. The lower control arm may be strengthened provided factory-mounting points to
cassis are maintained. The lower mounting point for the strut assembly may be modified for improved caster
or camber. Strut tower braces, lower tie bars, sway bars, and limit straps are permitted. Traction bars and devices
are permitted.

Suspension, Rear:
An OEM-style suspension is mandatory. Lowering or raising the vehicle height with suspension
modifications is permitted. Traction bars and devices are permitted; they must be bolt-on only; welds are
permitted for attachment to frame or axle housing. All OEM suspension mounting points must be retained and
used. Sway bars, limit straps, and camber kits are permitted. All rear suspensions must use at least one
working shock absorber per wheel. Airbag spring assistance is permitted; airbag compressors must be
disconnected. Blocked suspension is permitted.

The tires must be DOT street tires. Cut tires are prohibited. 102” max outside tire to outside tire.

Transfer Case:
Non-OEM transfer cases are prohibited. The transfer case must have been an option on a one-ton or
smaller pickup truck.
Transmission, Automatic:
Non-OEM transmissions prohibited. Aftermarket torque converters, valve bodies and internal components are
permitted. Transmission brakes are prohibited. Any non-OEM floor-mounted automatic transmission shifter
must be equipped with a spring-loaded positive reverse lockout devise to prevent the shifter from accidentally
being put into reverse gear. A functional neutral safety switch is mandatory. All transmission lines must be
metallic or high-pressure-type hose. All vehicles using an automatic transmission must be equipped with a
transmission shield meeting SFI Spec 4.1 and must be labeled accordingly. A blanket-type shield is permitted;
it must be appropriately labeled as meeting SFI Spec 4.1 and it must extend from the rear of the block to the front
of transmission main body. The bell housing area is to be completely covered with a six-inch overlap where it
is fastened. All non-blanket-type shields must incorporate two (or one, per manufacturer’s instructions) ¾ inch
by 1/8 inch straps that bolt to the shield on each side and pass under the transmission pan unless the transmission
pan is labeled as meeting SFI Spec 4.1. All vehicles using an automatic transmission must be equipped with a
flex plate meeting SFI Spec 29.1 and be covered by a flex plate shield meeting SFI Spec 30.1.

Transmission, Manual:
Non-OEM transmissions are prohibited. Aftermarket internal components are permitted. A clutch meeting
minimum SFI Spec 1.1 or 1.2 is mandatory on all vehicles. All manual transmissions must be clutch assisted.
Sequential shifters are prohibited. All vehicles equipped with a manual transmission must have a flywheel
shield labeled as meeting minimum SFI Spec 6.3 or greater. Applications for which an SFI Spec flywheel
shield is not available may use a properly attached SFI 4.1 or 4.2 blanket that completely covers the
bellhousing; it must be attached to the block and extend rearward to the transmission with a minimum six inch
overlap where it is fastened.

The vehicle is limited to a 2.6 inducer bore single turbocharger. The compressor wheel must protrude into a 2.6”
bore for 1/8”. The inlet will be measured using a 2.605” inch plug; the plug must not be able to enter the inducer
bore. A stock map width enhancement (MWE) groove is allowed. No MWE groove will be allowed that has a
width greater than .200”. All provisions allowing air into the wheel other than via bore and the MWE groove
are prohibited. The vehicle driver will be responsible for making compressor wheel accessible for tech
personnel to measure bore and able to inspect compressor wheel.

Water Injection:
Water injection is prohibited. All system components must be removed from the truck.

Ice Water Intercoolers:
Ice water intercoolers are allowed.

Maximum wheelbase-158”

A. All vehicles must be four wheel drive.

B. Diesel-powered truck to run 24” drawbar and 7500 lbs.

C. Engines
1.Engines are limited to a single automotive type engine
2 .Front of block must not extend more than 25 inches past centerline of front axle.
3. Diesel trucks with turbos limited to 2 pressure stages.

D. Acceptable fuels are alcohol and diesel.

E. All weights must be safely secured to truck, and must not extend forward more than 60 inches from the centerline of the front wheel.

F. Tubular frame is permitted. Diesel powered trucks wheelbase to be no more than 158 inches.

G. Planetary transmission is permitted.

H. Drawbars/Hitches
1. Diesel powered trucks: 24 inch drawbar height.
2. Hitch must be ridge in all directions and solidly mounted.
3. No clevis or chains permitted in hitching device.
4. No portion of truck may interfere with sled, chain or hook during pull or while being hooked or unhooked.
5. An area 5 inches wide and 12 inches high immediately above the drawbar must be free of all obstructions (including weights, wheelie bars and second drawbars) for ease of hooking and unhooking.
a. If body extends more than 12 inches behind point of hook, the open area must be 18 inches above drawbar and 24 inches wide at rear most point of body.
6. Vehicle must have tow hitch on front of vehicle.
a. It can extend no more than 6 inches ahead of the farthermost front portion of the vehicle.
b. It will not be counted when measuring length of vehicle.
c. It must have a 3-inch opening, positioned horizontally.
d. It must be strong enough to push or pull the vehicle at its heaviest weight.
e. It is to be used only for pushing or pulling the vehicle.

D. Body/Chassis
1. Vehicle must have hood, grill, and fenders in place as intended by manufacturer.
2. Vehicle body style must be or have been available from a dealer as mass produced.
3. Vehicle must maintain original appearance.
4. Vehicle appearance
a. No cab and bare chassis, or flat beds permitted.
b. Non-metal floor allowed in bed.
c. Fiberglass hood scoops, spoilers, fender flares are allowed.
d. Allowed to use stock appearing pickup truck and van fiberglass bodies and body parts.
5. Side doors must be mounted and closed if vehicle was manufactured with doors.
6. Truck doors must have a single latch design, allowing the door to be opened from both inside and outside.
7. Flip-top-body type vehicles and vehicles that do not have two (2) working doors must have an escape hatch through the roof.
Note: Escape hatch will not be counted as a working door.
8. Adjustable front shocks or suspension stops must be mechanical. Pneumatic, hydraulic, electrical adjustable stops not allowed.
9. Vehicles must have safety glass or plexiglass in windshield and rear window. Factory tint is permitted.
10. Vehicles in this division must have vertical bumpers at the rearmost point of the vehicle. Bottom of bumper to be a minimum of 8 inches vertically. Must be rigid.
11. Hood line variance: original hood line should be kept and a 3-inch maximum clearance opening will be allowed for speed equipment.
12. Truck must have floor or bed cover.
13. Truck may compete without tailgate or rear door(s) for greater hook point visibility.

I. Frames
1. May be different than the make and model of truck body.
2. Must be main supporting member of chassis, OEM truck frame.
3. Tubular steel frame is allowed.
4. Center of wheels cannot exceed plus or minus 6 inches of fender wells for wheelbase being used, which means that a vehicle may run up to a maximum of 133-inch wheelbase.
5. Wheels must be in fender wells as described above. Body may be stretched in middle to accompany this.
6. The outside edge of the tire on the narrow axle must overlap the centerline of the tire on the wide axle by at least one inch.

J. Safety
1. Vehicle must have a complete firewall with no holes except for controls. Holes not to exceed ½-inch larger than control. Only ¼” lexan, .060 steel or 3/16” aluminum are the only materials allowed for firewalls. No plexi-glass.
2. Operator’s compartment
a. No fuel tanks, fuel pressure gauges, fuel pumps and/or fuel lines are allowed in the operator’s compartment. All hydraulic lines must be shielded with .060 aluminum minimum.
b. If the fuel tank is located behind the driver, a fire barrier is required from the firewall to the rear of the driver’s seat. (0.060-inch aluminum or steel is acceptable fire barrier material.)
3. Vehicles must use wheels no more than 6 inches off the ground, within 6 inches of the forward most part of the vehicle.
a. Wheels must be a minimum of 6 inches in diameter by 2 inches wide.
b. Wheels must support the weight of the vehicle.
c. Wheels must be raised or removed for the purpose of ground clearance when vehicle is not on competition track.
d. Wheels must be a least 3 feet apart.
4. Weights must be safely secured to vehicle, and must not extend forward more than 60 inches from the center line of front wheel.

L. Tires
Rollout of bar tires to be maximum of 114” when cut.

M. Weight
1. Diesel powered trucks to weigh 7500 lbs.