NTPA TechServices logo4webLarry Richwine
Director of Technical Services
6705 E 900 N, Brownsburg, IN 46112
PH 317-852-0630 
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To order a NTPA rulebook, order online, call the NTPA office at 614-436-1761 or mail $6 plus $2 shipping and handling to WPI/NTPA, 6155-B Huntley Rd. Columbus, OH 43229. You may also order by e-mail at: This email address is being protected from spambots. You need JavaScript enabled to view it.  with credit card info.

2015 Membership Application (PDF)

***Effective immediately:                                                                                             ***

1. All divisions, SFI 6.2 or 6.3 aluminum belhousings must have a valid and current SFI sticker on it from the manufacture before being allowed to compete in the 2015 season.
Note: This only applies to aluminum belhousings.

2. The protest fee for fuel and or water testing has been raised to $1000.00 due to lab costs 

News Flash:

There will be a NTPA Entry School in Brownsburg, IN on April 19th at 1:00pm in Richwine’s shop. 
If you are or want to be a Entry clerk at any NTPA or NTPA state affiliate events we encourage you to attend. This school will last no more 1 ½ hours at no cost.


2015 Rule Changes

(Rules To Take Effect January 1, 2015)

On Sunday, September 14th, 2014, the joint WPI and NTPA Executive Boards met with the divisional committee representatives to determine the 2015 NTPA rules of competition.

As NTPA enters its 46th season, it recognizes that the environment of the sport of pulling is changing, and with this comes adaptation to continue pulling excellence in the best interest of the fans, pullers and sport as a whole. Decisions made at this meeting were in pursuit of satisfying some of these changes as well as maintaining the spirit of NTPA of trying to maintain uniformity in competition rules. The pulling universe includes several sanctioning bodies, and as NTPA realizes that the walls of rule uniformity have pushed beyond its own sanction; it wishes to facilitate participation with a wider percentage of potential competitors – whether they are current, future, or previous members.

A few of these changes will ease the former barriers from the process of pullers to participate at NTPA Events in the future. NTPA continues to stand by its safety record and current SFI standards that give NTPA the ability to continue its sterling safety record while enhancing its appeal for a greater portion of the pulling community to compete.

The following rules will take effect for the 2015 season:

All Divisions:

1. The WPI / NTPA Executive boards has decided to discontinue the Clutch Inspection program and no longer require competitors to annually remove the clutch assembly for inspection.
The competitor, by agreeing to run under all NTPA safety rules and regulations in place are required to use SFI approved clutch assemblies and contain them in SFI approved containment devices, i.e. SFI approved bellhousings or SFI approved blankets.

2. Diesel and Biodiesel specs have been removed from the rulebook.
   Both Diesel, Biodiesel or a blend of the two are legal fuel for Diesel only classes.

3. The rule which reads:
Water and soluble oil (no other additives) are the only ingredients allowed for water injection has not changed.
*Note: Diesel / Biodiesel testing will cease starting January 1, 2015

4.Kill switch location: On Pro Stock, Super Stock, Super Farm and Modified tractors it must be located in the rear center of the vehicle (maximum of 6 inches off center in any direction), 40 inches above point of hook.

5. Kill switch location: On TWD and FWD vehicles it must be located in the rear center of the vehicle (maximum of 6 inches off center in any direction), 16 inches above the point of hook.

All tractor divisions

No air bags or air shocks allowed in any form on front axle, the use of shock absorbers or coil over shocks is allowed.
NOTE: This has been tabled until the 2015 September meetings and will be reconsidered for the 2016 NTPA season.

Mini Rod

The drawbar pull point pin has been increased to a 5/8 grade 8 minimum.


1. Semi tire maximum circumference of 145” at 30psi
2. Semi tire maximum tread width 10”


No changes were made to the current 2014 Regional Modified rules and they were locked in for a three year period.(Thru 2017)

Super Farm

The turbocharger seal program has been discontinued and the Super farm turbo rule now reads:


  1. Exhaust bolt pattern no larger than 2.750 inches x 3.5 inches, or 69 mm. x 88 mm.
  2. No altering of a housing to accommodate a smaller base; e.g., T-18A95 with a small base welded to it.


  1. Map width enhancement is allowed. Maximum map width limit of .200”. MWE groove must be inside neck area where intake covered is measured at 3 inches.
  2. Compressor wheel must protrude into the three inch opening at least 1/8 inch.
  3. Intake housing to be no larger than three inches at the face of the wheel.


  1. All turbine wheel tips of wheel must protrude into 3 inch opening at least 1/8 inch.
  2. All air must exit through the 3 inch opening.
  3. Turbine wheel exhaust blade to be no less than 2.90 inches in diameter at intersection of turbine wheel face and tip diameter.
  4. Turbine housing to be no larger than three inches at intersection of turbine wheel face and tip diameter.
  5. No wastegates permitted.
  6. No variable geometric turbos permitted.

Intake Manifold no longer required to be OEM. SF intake rule now reads: Maximum inlet size 3.75 inches measured on the outside diameter, one inlet pipe only.

10,000 Pro-Stock Tractor

Aftermarket Block allowed following these guidelines:

OEM aftermarket replacement blocks permitted, (10,000 Pro Stock tractors only, Not allowed in Lgt Pro, Limited Pro or SF classes)

  1. Steel Billet or recast Steel, no aluminum.
  2. Acceptable blocks must have come from 2WD tractors.
  3. Camshaft must remain in the OEM location. No overhead camshafts permitted.
  4. Fuel injection pump must remain in OEM location.
  5. Height maximum - Center of crankshaft to cylinder head surface not to exceed one inch over OEM dimension (block, gaskets, deck/spacer plates)
  6. Block width and length must be OEM measurements and able to use OEM gaskets.
  7. Block will be inspected and approved by NTPA Tech Services before being allowed to compete.

***One inch reason is for the built in deckplate no other plate allowed.



Tech Questions and Answers

Protest question

Question about protest procedure:

I understand that if I protest my fellow competitor for cubic inches then I must put up $500. He then is checked and if found legal he gets my $500, but if illegal I get my $500 back and he is suspended. Is that correct?

For fuel and water, however, a lab test comes with a cost in itself (the reason for raising the protest dollar number). So, my question is if I put up $1,000 to protest my fellow competitor, and he is found illegal - do I get my money back? If so, all of it? Or just part? If he is found legal - does he get my money? If so, all of it? Or just part? If the test costs $999, then I would could have to submit myself to a sample that if found legal I get $1? Or I could protest and have to pay $999 just to see the rule enforced?


Wow, good questions, first you are correct on both points.
The cost of a lab sample is $600-$700 per sample plus shipping to get the results we need to determine if they have Nitromethane or Oxygening agents in the fuel.
BTW, the Styrofoam cup is a good indicator if Nitro is present....

TWD Headers


Uncle Larry,
Can I run traditional funny car headers on my twd or do I have to run the ugly ones ?

I know there's a rule that says the headers have to extend 10 inches above the curve  Does that apply to twd funny car headers?


The 10" rule is a "minimum" but, they are required to discharge "up" within 10 degrees of "plum" rather than aim "back" they need to turn-up at the tip..

Power Mist fuel


Mr. Rickwine,
With the fuel standards now opened up can I run the powrmit fuel additive in my diesel fuel?


Well, the fuel rules still state under Diesel fuel: The use of additives containing oxygen, such as Nitromethane,
propylene oxide, dioaxane, MTBE, alcohol, or nitrous oxide are strictly prohibited.
With that said be aware that the Power Mist stuff may contain some of those things and if caught would be a disqulification.

Cloverdale, IN.


Hey Richwine,

What's the class order at Cloverdale??


I'm pretty sure it will be  Pro ST, TWD, Diesel SS both nights. That's the plan as I know it so far.

Louisville Fuel


Hey Richwine,

Are you doing fuel testing at Louisville this year? Have they changed their rules?


Yes, I will be there and the Louisville rules are the same as last year.

Tech Officials in Canada



We have a club up here in Canada. We run NTPA rules for our club.
We have a tech committee that takes care of everything for our events and they would like to know what they would have to do to become certified NTPA officials.


NTPA officials are certified thru a tech school system that has been the norm since the 1970's The potential officials have to attend school and pass a written test administered thru the SFI foundation in California. They then have to "apprentice" for a number of years of "teching" vehicles before they are approved to be "on track" flagmen.

All NTPA tech schools are open to anyone that wants to attend, however, NTPA does not grant a "Tech Licence" to anyone that is not endorsed by a NTPA affiliate member state or the NTPA itself.

What the Hell are you doin?


Mr. Richwine,
I have a few questions that I guess nobody on the executive board has considered.
1. Have you and WPI lost your mind? Don't you know that you've done away with most of
your duty / job, are you gettin soft? I've heard that it's a "membership drive" for the pullers
out here in Region 3 but, what's gona keep the pullers from running any old clutch?
What are you gona do when it blows up? Which "Rocket Scientist" came up with this?
I know that all the "other" groups don't do it, but, now that nobody's checking them I feel that you've made a terrible mistake.
2. Same thing of Super Farm turbos and manifolds, are you guys so hard up for membership that you guys just rollover?
3. Again, what the hell are you doing? You quit checking fuel / water, dammit, the crybabies in Wis will really dump in the additives now.


I will answer (best I can) in the order ask.

1. It's not a membership drive, we're not getting soft....The NTPA rulebook requires that SFI clutch components be used, and SFI Blankets and Belhousings be used to contain the clutch / transmission parts. When a Puller buys a membership (Regular or Per Hook) they agree to run all the rules and regulations listed in the NTPA rulebook. Honestly even if we inspect the clutch assembly we have no "proof" that the puller went home and actually installed it in his vehicle. So, with that said the SFI containment is the only component that we can actually inspect at the event. BTW, the vehicle "inspection form" has been updated (long over due) to a more in depth inspection.

2. Turbo inspection for Super Farm has been discontinued so competitors can come back and forth between the different organizations.

3. Diesel / Bio Diesel Fuel won't be checked unless a protest has been filed and then it will be sent to a lab. The reason is many pullers want to run a blend of Diesel and Bio and there is no "in field" test that can test it when more than a 15% blend of Bio.

4. Water will be tested as in the past. The "No water test" thing was changed back to the 2014 rules about a week after it came out in September.

All good questions, thanks


New rules question


Hey Richwine, with all the new "rules" or lack thereof, I guess I can just come run
my SF without any more inspections than the guys out here in Missouri. Is that correct?


No, you still have to have a valid NTPA / SFI rollcage sticker and all the SFI equipment on like before.
The only difference for your Super Farm tractor than before is that the turbo doesn't have to be sealed now
and you no longer have your clutch inspected prior to running. You still have to have a SFI clutch assembly in
your tractor, and it has to be wrapped in a SFI 4.2 blanket.

Super Farm at NC State fair


Mr. Larry,
Can we run a MAP ring on our Super Farm turbo at the north Carolina State Fair? I saw in the rules that it's legal now.


No, not yet. Those rules take effect on January 1, 2015.

Diesel fuel


Larry, can I run sparkplugs in my LgtPro now that you don't have a standard for "Diesel Fuel"?  I mean what's to stop me from calling the clear liquid in my tank diesel, when it may be something else?

No, you can't have sparkplugs. The rule now will say Diesel or Bio-Diesel or a blend there of. If protested it would go to a lab and be subject to any/all testing to determine what was in it. As for a infield test the dielectric meter and or the Bio test equipment would read a (+) positive number for diesel or Bio and
a (-) number for gasoline or methanol.
Note: We listed the Dielectric numbers for Diesel starting in 1997. There is NO infield test that can determine what blend a Diesel/Bio is. The tests we had would only check for pure B-100 or Diesel, when the diesel was blended over 15% with Bio it would not pass the dielectric meter. That is the reason for discontinuing the Diesel/Bio testing. If we didn't outlaw Bio, and so many were blending it, then we stop testing.

Good question,


Map Ring

Question / Comment:

Hey Larry,
I see you have got all the "proposed 15 rules" posted. So, I see your suggesting that the
SF have a map Ring. How many times U gone beat that horse? We don't want that up here.
We have too much invested in the charger we got now.


That was put on the agenda by a Super Farm person, not me.


Question/ Comment:

Richwine, You need to grow some b_lls and do your job and crack down on Semi rules. I find it to be BS the way you protect the cheaters and let them contiue to pull. By the way have you notice how low the numbers are in some of the clases Maybe a little care about your "position" would help matters , a blind eye and deaf ears is what i see going on . Before I brought this to your atten I talked to a few pullers and they told me that this what would happen , that's why I'm pissed off no care about doing the right thing.


Dear D,

Normally I catch heck for doing my job TOO well and get accused of "picking" on somebody. It's refreshing to hear that you are unhappy for a new reason. While my "position" says Director of Tech Services, I'm only as bad or good as the people that work with me on the Tech Team. We attempt to treat everybody with equal and "common sense" while interpreting the rules consistently. Since I haven't satisfied your concerns in a matter that suits you, I have forwarded your concerns to the people that actually direct me in my decisions.

As to your comment that a blind eye and deaf ears is what you see going on before you brought this to my "atten" and the fact that you "talked to a few pullers" and they told you that this what would happen. I'm sorry you talked to those people, they are probably the people that normally feel "Picked on" I can assure you I do notice and take notes on all matters in my control. I will attempt to resolve your concerns.

In closing, thanks for your input. I'm glad someone has decided to replace the "Old Feller" in the Semi class. Please get my attention at the next event you attend and hopefully we can have a "chat" regarding your "position"


Super farm Detroit engine


Mr. Larry

I run the Super Farm class and I want to up grade my engine in my AC.
If I use the 40 Detriot engine can I change the head and get rid of the cast in head manifolds?


No, The rules for Super Farm, Ligt Pro and Limted Pro all say that you must use the OEM head
for the model / series engine. So, NO you cannot put the IH head on the Detroit engine.

TWD Cubic Inch Question

Question: Mr. Ricwine, I see in the Rule Book that it states: At all levels of TWD NTPA competition — a limit of 575 cu. in. and two valves per cylinder, does that have the plus one percent like the other classes? I don't want to be found illegal if protested or measured.

Answer: Yes that includes a plus or minus one percent, it is found in general rules and applies to all classes including TWD.

Exhibition run


Hello Larry Richwine,

 I am from WI I have built a unique tractor , I have six GS 1000 Suzuki engines at 100 hp a piece. I was wondering if I could pull a exhibition pull in Tomah in the Mini Rods class. I am 3400 hundred lbs with my body weight included. I pulled in Tomah a few years ago in the garden tractor class that they had. It was a great experience and I would really like to show off my new toy. I think it would be a big hit as it has been locally.  I built the tractor not to only meet but exceed the safety regulations; I am fully insured, and will pay any insurance fees that is involved in the pulling process. Thank you for your time.


Sounds pretty cool, however, the NTPA doesn't allow non-NTPA classed vehicles anymore at our events. As a result of a few problems/claims in years past our insurance no longer allows us to do this. With that said, there is no possible way to pull down the track at Tomah.

Pinetops, NC


Hey Richwine,
Will you or somebody be at Pinetops to do Cages?


Yes, I'll be there Friday and Saturday....I'll be doing Rollcage and Turbine inspections...

Pro Farm Tires


Can I run Radial Tires on my Pro Farm?? The other guys do.


No, the rulebook doesn't allow them in any Division

Catch Can Question


So, What the H_ll is the rule? Do I have to have this catch can crap or not? I'm so tired of you people making rules and then changing them later. Make up your mind Mr. Genius, do I have to have one or not?

Mr. H


Mr. Happy, long time no talk........No the catch can is not mandated (required) but, recomended. The excessive spill rule will be enforced and somebody will be even more upset as soon as we enforce the rule as written. If breakage is the reason that will be excused, but, there some pullers that have a "history" of greasing the track. If it were me, I'd put one on my vehicle and hope it works if I have a history of spilling oil or water.

Contact Info

    National Tractor Pullers Association
    6155-B Huntley Road,
    Columbus, OH 43229
  • PHONE:
    (614) 436-1761
  • FAX:
    (614) 436-0964