|OHIO MODIFIED TRACTOR PULLER ASSOCIATION
Modified Tractor Rules and Limitations
All drivers and crew members must act in a sensible manner. If not, after one warning they will
face possible expulsion from the organization.
1-2 AGE REQUIREMENTS
Drivers must be 16 years old. 16-18 years old must sign a release waiver.
Membership is open to anyone who keeps their dues current, and follows the guidelines set forth
by the club. You must be a current member of the O.M.T.P.A. To pull at a O.M.T.P.A. Event.
1-4 RULES VIOLATIONS
1st violation – lose points and money for that day.
2nd violation – barred from the club for 1 year and 1 day.
1-5 Purse Payout
If the purse at a pull is paid in full, it will be dispersed to the club for placing. The purse money will
be paid to tractors attending that move the sled. Any money left will be divided between the pullers.
If there are less than 10 tractors at an event and if any members come to a pull, pays an entry fee,
crosses the scale and hooks but cannot pull because of mechanical failure, they will receive last
place money. If there is more than one puller that has mechanical failure, the last place money
would be divided between them.
CLASSES / POINTS SYSTEM / PULLOFFS
A. Up to 2 Supercharged V-8s (no hi helix allowed)
B. 1 Supercharged cast block hemi (8-71 blower limit, hi helix allowed)
C. Up to 3 naturally aspirated V-8s
D. Up to 2 cast block hemi naturally aspirated
E. 1 carbureted Allison / Packard / Rolls-Royce V-12 carbureted with no auxiliary blowers
F. Up to 4 naturally aspirated small block V-8s
G. ONE TURBINE or combination of N.T.P.A recognized turbines not exceeding a maximum of
2850 total HP, using ratings as approved by the N.T.P.A.
H. Up to 2 Automotive Diesel engines
I. Single Engine 572 ci. with Hi Helix 1471
J. No spread bore heads
2-2 POINTS SYSTEM
Any tractor that shows up to the hook will be awarded 5 points. Points will be awarded to the
tractor in declining increments of 1 point, from 1st to last. For example – if a class has 12 tractors,
the points will be awarded as such: 12 pts for 1st
11 pts for 2nd
10 pts for 3rd
2-3 POINTS – YEAR END AWARD
Awards will be given out upon availability. This will be voted on prior to the seasons start.
2-4 MANDATORY MEETING POINTS
10 pts will be awarded to the TRACTOR for the competitor that attends the MANDATORY meeting.
This is an incentive for all competitors to attend the annual rules meeting.
CERTIFICATION AN PROTESTS
Certifications of a tractor are required. This includes weighing, drawbar measurement, and
inspection of all safety equipment and the tractor itself. Certification must be checked and certified
by one of the elected tech officials on each competing tractor, no-one is allowed to certify there
3-2 TRACTOR WEIGHT
Tractor and driver can only weigh a maximum of 6500 lbs. No addition can be made after weigh-
ins (without reweighing).
3-3 WEIGH OUT
If required by the pulls officials, it must then be done by all pullers.
In order to protest a tractor a member requires a $50.00 deposit up front. First, contact a rules
officer. Item protested will be checked and either puller or protester will receive money. This goes
for protest of any type, i.e. equipment, rules, and fuels (fuel sample to be taken and tested at an
independent lab, at loser’s expense), or for any other protest.
The loss of any weight while hooked to the sled.
A warning will be issued from official if there is excessive liquid spilled on the track. If problem is
not corrected before the next class, or the next pull, you will be disqualified.
4-3 OUT OF BOUNDS
Out of bounds with any part of the tractor only. Boundary will be determined by either a chalk line,
or stakes. Measurement will be taken from that point, no d/q if before 75 ft. mark.
Any illegal equipment will be cause for disqualification.
4-5 START LINE
Leaving the start line under the red flag.
Any unsportsmanlike conduct will not be tolerated.
No illegal fuel allowed (nitro methane, nitrous oxide, or other oxygen carriers).
4-8 PULL OFF
On a pull off any disqualification rule applies, but the puller being disqualified while pulling in the
pull off will only drop to whatever last position in the pull off would be. For example, if there were
two tractors in a pull off and one was disqualified, the disqualified tractor would receive 2nd place
points and money.
The violation of any other rule (equipment, weight, track, etc.) will be cause for disqualification.
PULL RULES / TRACK RULES / CLASS RESTART
5-1 TRACK SAFETY
During the pull, safety is always in the front of everyone’s mind. The crowd must be kept at least
25 feet from the track area in all directions. Spectators in the pit area are to be kept to a
minimum. The ends of the track must be kept open at all times. The O.M.T.P.A. will not operate
any pull at which a safety hazard is posed to anyone.
5-2 ENTRY LIMIT
Each tractor will be limited to one entry per class.
5-3 PACE TRACTOR
No pace tractor will be used.
No weights, brackets, or braces may interfere with the hookup of the sled or interfere with the
chain during the pull.
5-5 LEAVING TRACK
If possible tractors should leave the track under their own power. Please have tow vehicles ready
at the end of each pass.
5-6 TRACK SIZE
Outdoor track should be 300 feet long and not less than 30 feet wide.
No measurement beyond the length of the track. If pull conditions warrant, a floating finish (no
300 ft. full pull, but go until the sled stops) may be used as an option. Pullers will be informed
before a floating finish is used.
5-8 TRACTOR OPERATION
While pulling the tractor it must be operated in a safe manner. Officials have the right to disqualify
any driver that cannot handle his/her tractor in a safe and orderly manner.
5-9 FIRESUIT & CLOTHING
Mandatory for all drivers
Fire Suit, Driving Gloves, Driving Shoes or Leather Shoes and Helmet.
(No Tennis Shoes)
5- 10 RIDERS
Driver only is allowed on the tractor while it is moving. No riders allowed while hooked to the sled,
on the track, driving to or away from the track or driving in the pit area.
5-11SPOTTING ON THE SLED
Each puller has the privilege of, and the responsibility for, spotting the sled. Pull back tractor
operator, or sled operator must be notified when, or before, previous tractor unhooks from the sled.
5-12 ENTERING THE CLASS
Tractor must be entered in the class the competitor desires to pull in before the pull starts, unless
the officials are agreeable to the reason for the lateness of the competitor.
5-13 STARTING TIME LIMIT
Tractor and driver will have 3 minutes to make it to the sled after it is pulled back and ready to
hook; unless conditions don’t allow it.
5-14 TEST PULLER
Number one puller will be the test puller and may take that pull if the weight machine is ok. To
receive first puller options, the tractor must hook to the sled and attempt a pull. If he refuses that
pull, he will choose the position that he will return. Choice must be made before unhooking from
5-15 CLASS RESTART
A class restart will be up to the discretion of the track officials.
5-16 SECOND ATTEMPT
If the puller wishes to make a second attempt, he/she must attempt to stop before the front of the
sled passes the 75 foot mark. A track official stationed near the 75 foot mark will make the
decision of whether an attempt was made. Your second attempt must be at that time, unless
tractor is broken. If broken, and repairs can be made before the end of the class, you may come
back for your second attempt. At that time you will have only one attempt.
5-17 OUT OF BOUNDS
Anyone going beyond the side line stakes with any position of the tractor is disqualified. Out of
bounds, or any other disqualification, 1st puller or not, driver is disqualified, unless class is
restarted. Boundary will either be determined by chalk lines or by stakes. D/Q pullers will receive
last place monies and points. Unless D/Q in the pull off the puller will receive last in the pulloff
points and monies.
5-18 FIRST PULLER ON RESTART
On a restart of a class; the original 1st puller has the option of being 1st puller or a drop. It will be
the responsibility of the first puller to remain at the track until the decision is made by the track
official whether to continue or sestart the class. If the original first puller rejects the 1st restart
position it would then go to the next in line of the restart. This puller will now have the 1st puller
designation. Tractors that pulled before the restart will restart in the position according to how they
were on the lineup sheet.
5-19 DRAWBAR HEIGHT CHECK
Mandatory drawbar height check will be done at the beginning of the track before each pull
attempt. Checking is driver’s responsibility.
5-20 TIES / PULL-OFFS
In case of a first place tie there must be a pull off.
5-21 FIRST PLACE PULL-OFF
In a first place pull-off all participants shall be required to make and honest attempt to pull or
he/she will receive some points and the money as the top vehicle that did not qualify for the pull-
off. The exception to the first place puller-off rule may be made by track official’s discretion only if
the track conditions are bad (conditions determined by track official), or if all pull off participants
agree to splitting points and money. If the track conditions are normal, and participants are able a
pull-off must be help. If one participant wants a pull-off, regardless of conditions, then the first
place pull-off must take place.
5-22 FLOATING FINISH PULL OFF
A floating finish may be used in a pull-off at the discretion of the track official and sled operator. All
pull-off competitors must be informed in advance of the pull-off about floating finish.
SAFETY EQUIPMENT, REGULATIONS
6-1 STARTED TRACTORS
If the tractor is running, a qualified operator must be in the driver’s seat.
Racing competition helmets or motorcycle helmets are required. You must have your helmet on
when driving onto the track and while tractor is hooked to the sled. Chin strap must be fastened.
6-3 FIRE EXTINGUISHER
All tractors must be equipped with a working fire extinguisher, minimum 2 ½ lb. dry chemical, or
equivalent, located convenient to the driver (so that the driver can reach it while seated on the
All weights must be securely fastened to tractor or tractor weight brackets. No loose weights
allowed anywhere on tractor.
6-5 SCATTER BLANKET
A scatter blanket is required. Specifications are listed under Modified Equipment Rules.
6-6 KILL SWITCH
Safety kill switch at the rear of the tractor.
6-7 FIRE SUITS
A regulation fire suit is mandatory for all drivers.
All tractors must be equipped with a rollcage.
CHAPTER 7 - MODIFIED EQUIPMENT RULES
7-1 MODIFIED ENGINE COMBINATIONS SPECS
A. UP TO 2 SUPERCHARGED V-8 ENGIINES (no hi helix)
Up to 2 supercharged engines with the maximum supercharger
size of 8-71. Max Overdrive 42%
All superchargers must be mounted to the intake manifold by use of aluminum studs only. A
supercharger restraint system is mandatory and shall consist of four separate straps, one on
each corner of the supercharger, with each strap securely fastened to the engine by means of its
own attachment bracket. The top attachment bracket to be sandwiched between the lower surface
on the injector body and the upper surface of the supercharger case. The bottom attachment
bracket for each strap shall be connected to the engine by a minimum of one 5/16 inch bolt or stud
(SAE Grade 5 or better). Blower belt shield must be wider than all components, idler, belt pulleys,
etc. and extend to the bottom of the bottom pulley or below. Screw-type per chargers are not
permitted for competition vehicles.
B. 1-SUPERCHARGED HEMI (hi helix allowed)
Must be cast block 8-71 max blower size. All safety specs will be the same as the multiple blown
V-8 class (7-1A) listed above. Max overdrive 42%.
C. UP TO 3 NATURALLY ASPIRATED V-8
Must be cast block.
D. UP TO 2 NATURALLY ASPIRATED HEMIS
Must be cast block.
E. ONE CARBURETED ALLISON – PACKARD – ROLL-ROYCE
Must be carbureted with no auxiliary blowers.
F. FOUR NATURALLY ASPIRATED SMALL BLACKS V-8
Must be cast small block.
G. ONE TURBINE or combination of N.T.P.A recognized turbine not exceeding a maximum of
2850 total HP, using ratings as approved by the N.T.P.A.
H. Diesel Engines .
2 Engine Limit
450 Cubic Inch Limit.
Automotive Engine with direct injection only.
3 charger set up on SINGLE ENGINE with 4 ½ inch or smaller inducer bore.
2 chargers per engine on 2 ENGINE set up with 3 ½ inch or smaller inducer bore. (Note: charger
may be up to 4 ½ inch but must be reduced to 3 ½ at inlet)
Check for oblong holes in the inlet.
NO variable vane turbo.
Diesel fuel only with the exception of water/methanol injection. (for cooling purposes)
No nitrous, propane, natural gas, ect.
No super chargers.
Turbo must have safety shield.
Exhaust must exit straight up.
Engine needs head restraints.
Each engine must have air guillotine to shut down engine or engines connected to the rear kill
Must have sfi damper and it must be guarded.
I. Single Engine 572 ci. with Hi Helix 1471 .
48% overdrive Cast Block
Aluminum Heads ( not spread bore )
Effective Date January 1, 2013 to January 2015
7-2 DEFLECTION SHIELD
Deflection shield is required on both sides of the engine, from the bottom of the head and
extending to 2 inches below the bottom center throw of the crankshaft.
7-3 DEADMANS THROTTLE
All throttle working in a forward / rearward direction shall be closed in the uppermost position,
must be a positive 2-way linkage.
7-4 HARMONIC BALANCERS
Harmonic balancers shall be shrouded with ¼” steel no more than 1” away in any direction of
rotation, 360 degrees and securely fastened, and have at least 2 – 1” straps across the front of the
shroud to deflect flying debris.
All fans must be shrouded with steel 1/16” or thicker, 360 degrees. Electric fans excluded.
Exhaust must be discharged vertically, and be a minimum in height of 12” above the bend in the
pipe. No rain caps.
All forms of nitro methane (including nitrous oxide) are illegal as a fuel additive. Legal fuels are
gasoline, kerosene, alcohol and aviation gas.
7-8 FUEL DELIVERY
Fuel delivery must match engine type.
7-9 KILL SWITCH
Kill switches must be located in the rear center of the tractor. Kill switches must break the entire
electrical system. CONTSTRUCTION: Kill switch cable must be enclosed, so that if the tractor
unhooks from the sled, cable can be separated from tractor without obstruction from the tractor.
All modified tractors are required to have fenders or a shield or both, between driver and any part
of the rear tire.
7-11 WHEELIE BARS
Wheelie bars are required and shall be able to support the tractor’s weight and be no more than
10” off the ground and have a pad at least 3” square, must extend beyond rear of tire.
7-12 TRACTOR LENGTH
No portion of the tractor, including weights, may exceed 14 feet forward on the center of the rear
All tractors must have functional brakes.
7-14 DRAWBAR CONSTRUCTION & PLACEMENT
Minimum length of drawbar will be 18 inches from center of the axle to the point of hook, and have
a maximum height of 20 inches from the top of the hitch to the ground. Drawbars must be RIGID
in all directions.
The hook point will be an oblong shape 3 ¾” long x 3” wide with a maximum of 3 ¾” round
opening. Minimum of 1” from the back of the hole.
7-16 CLUTCH, FLYWHEEL, AND AUTOMATIC TRANSMISSION
Tractors using a manual clutch shall be equipped with a blow proof bell housing, flywheel, and
clutch assembly. Automatic transmissions will be completely covered with safety blankets from
the back of the block to the
7-17 DRIVESHAFTS AND COUPLERS
Drive shafts will be enclosed in a 3/16” minimum steel tube ¼ aluminum. Inside diameter not to
exceed 2” larger than the diameter of the largest universal joint or coupler.
7-18 ENGINE SUPPORT
Engines must have a support saddle at the rear of the engine, and in front of any auxiliary
transmission; 3/8” steel, 5/16” chain or cable, or rear block plate.
7-19 TRACTOR FRONT END
Tractors shall have a wide front axle. Front wheels shall track within the rear wheels.
7-20 TIRE SIZE
Rear tires shall be no bigger than 30.5” x 32”.
7-21 STARTED INTERRUPT SWITCH
All tractors must be equipped with a starter interrupt switch on the gear shift which will allow
started engagement only in a neutral or park gear-shift position.
No portion of the tractor may interfere with the sled during the pull.
7-23 IF YOU AR ILLEGAL
1. Forfeit the year’s points.
2. Refund any prize money received at that pull.
3. Tractor and all drivers connected with that tractor are suspended
one year and one day from the day prize money is refunded for
that day. (Refunded prize money goes to the O.M.T.P.A.)
7-24 RULES ENFORCEMENT
The O.M.T.P.A. reserves the right to apply any rules stated above. Changes can be made with a
majority vote of all members entered to pull at this event.
|Click the link below to download
|the Bylaws for 2009