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.

2017 Membership Application (PDF)

Items that go into effect for the 2017 NTPA season

General Rules

  1. 4 clamps per cable or crimped ends are now required on engines that require cables.
  2. All classes at all levels will be conducted under a floating finish. Tracks will a maximum of 330 feet with no exceptionboundary lines will extend to 330 feet. Vehicles get red flagged if they exceed the 330 feet and must come back for a pulloff
  3. Page 35: Section M #1c (add) or a light attached to the power feed if the kill switch interrupts the ignition power supply. (This may be used for kill switch testing)
  4. The diesel fuel testing system and rules has been reinstated with new specs, The rule will read:
    The NTPA will evaluate diesel fuel using the dielectric constant value. That value shall be determined by the NTPA fuel check meter only. The NTPA fuel check meter shall use Cyclohexane to establish the zero reference point for determining all diesel fuel dielectric constant values. Diesel fuel to be used in NTPA competition shall have a dielectric value of no greater than 8.5, nor a value of no less than 2.2.
  5.  Allow a 1/2" steel spacer for clutch clearance on cast OEM chassis .

Super Stock

  1. A turbo inlet restrictor plate is required for all SS classes. (Size and dimensions to be determined)  
    The Restrictor plate rule for the Super Stock division has been tabled until the September 2017 meetings and will be considered for the 2018 season. This will allow time to do more research as to the size and dimensions needed.
  2. NTPA will now allow aluminum billet engine in all SS classes. The rule now reads on page 5: D. Engines
    1. Steel billet, aluminum billet and steel recast blocks allowed. The specifications for the block will be based on factory OEM specs of the block chosen to be replaced with a allowance for the 5/8 in deck plate and limited to 540 cubic inch. 

Pro Stock tractors

  1. Component chassis, V-8 diesel engines only be allowed if they were offered in a two wheel drive tractor from factory.

Pro Farm

  1. Change Rule 4C to read, intake manifold may be non OEM with a maximum inlet size 3.75 inches measured on the outside diameter one inlet pipe only.

Diesel FWD trucks

  1. The SSD FWD class has been made a Grand National class.
  2. NTPA has added a 3.0 and 3.6 Diesel FWD  (class Rules listed below.) 

    3.0 Pro Stock Diesel 4X4 Truck
    1. All normal FWD rules apply with the following additions:
    2. Maximum weight 8000 lbs
    A. Body / Chassis
    1. Trucks must remain stock appearing. Must have full size steel or OEM type body. The OEM chassis is mandatory. (no tube chassis permitted). The vehicle must retain the full OEM chassis. The complete OEM floor pan is mandatory. Wheel tubs, back-half conversions, tube chassis, etc., are prohibited.
    2. Front weights must be no more than 60” from the center line of the front axle to forward most point and be securely fastened. No weights are allowed in cab of truck if in bed of truck they are to be securely fastened to bed of truck. (no tarp straps).
    3. Maximum wheelbase 158” and 102” maximum track width (outside tire to outside tire).
    4. Front brakes are required.
    B. Suspension
    1. Front upper mounting point for strut assemblies must be in the factory location.
    2. Adjustable caster/camber pillow ball mounts are permitted. The lower control arm may be strengthened provided factory-mounting points to chassis are maintained. Strut tower braces, lower tie bars, sway bars, and limit straps are permitted. Traction bars and devices are permitted.
    3. Lowering or raising the vehicle height with suspension modifications is permitted; must be bolt on only; welds permitted for attachment to frame or axle housing. Sway bars, limit straps, and camber kits permitted. Traction bars and devices are permitted; Blocked suspension is permitted. No air bags.
    C. Engine
    1. Maximum engine size will be 460 cubic inch. Engines must come from factory in one ton or smaller Diesel pickup truck. Front of engine block can be no farther forward than 17” of centerline of front axle. No aftermarket blocks permitted. No Billet Blocks permitted.
    2. Cylinder head must be OEM or OEM cast replica for that brand engine. Outside of cylinder head must measure OEM width and length. Head must retain OEM valve angle.
    3. Maximum of one P7100 pump limited to one plunger per cylinder. The use of multiple high-pressure common-rail fuel pumps is legal.
    4. Turbo limited to a 3.0” smooth bore single turbocharger. The compressor wheel must protrude into a 3.0” bore for 1/8”. No map width enhancement (MWE) grove allowed.
    5. Intercoolers are allowed.
    6. Diesel fuel only. (see Fuels for specs) No propane or NO2 permitted or any other oxygen enhancers.
    7. Water injection is prohibited. All system components must be removed from the truck.
    8. All inline turbocharged engines are required to have one cable that must surround the engine block and head. This cable must be placed between first and second cylinder through exhaust manifold port area.
    a. Cable must be a minimum of 3/8-inch thickness.
    b. Cable must have a minimum of (4) clamps at the splice.
    c. Cable must have no more than 4 inches of slack.
    9. 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 6” of the turbo.
    D. Driveline/Driveline Shielding
    1. Drivetrain will consist of any front axle, transmission, transfer case, rear axle permitted. No planetaries permitted
    2. All clutches, belhousings and automatic transmissions must comply with the SFI specs and rules covered in General rules.
    3. Vehicle must have three (3) round metal loops shielding metal loops).
    a. 360 degree loop must be a minimum of 3/8-inch aluminum or 5/16-inch steel, 3/4-inch wide (or wider) and not more than 2 inches from the shaft in any direction.
    b. End loops to be placed no farther than 6 inches from universal joints, with third loop in center of shaft.
    c. May use a solid tube (3/8-inch aluminum or 5/16-inch steel) to meet the above requirements.
    E. Hitch
    1. 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.
    F. Tires
    1. Must be DOT approved tire. Maximum tire height 35 inches. No studded tires or chains. No alterations to tires permitted. No bar or terra tires. No front duals on front axle permitted.

  3. 3.6 Pro Stock Diesel 4X4 Truck
    1. All normal FWD rules apply with the following additions:
    2. Maximum weight 7800lbs.
    A. Body / Chassis
    1. Trucks must remain stock appearing. Must have full size steel or OEM type body. The OEM chassis is mandatory. (no tube chassis permitted). The vehicle must retain the full OEM chassis. The complete OEM floor pan is mandatory. Wheel tubs, back-half conversions, tube chassis, etc., are prohibited.
    2. Front weights must be no more than 60” from the center line of the front axle to forward most point and be securely fastened. No weights are allowed in cab of truck if in bed of truck they are to be securely fastened to bed of truck. (no tarp straps).
    3. Maximum wheelbase 158” and 102” maximum track width (outside tire to outside tire).
    4. Front brakes are required.
    B. Suspension
    1. Suspension modifications are permitted. Removable suspension blocks are permitted.
    C. Engine
    1. Maximum engine size will be 460 cubic inch. Engines must come from factory in one ton or smaller Diesel pickup truck. Front of engine block can be no farther forward than 17” of centerline of front axle. No aftermarket blocks permitted. No Billet Blocks permitted.
    2. Cylinder head must be OEM or OEM cast replica for that brand engine. Outside of cylinder head must measure OEM width and length. Head must retain OEM valve angle.
    3. Maximum of one P7100  pump P-pump limited to one plunger per cylinder. The use of multiple high-pressure common-rail fuel pumps is legal.
    4. Turbocharger must have smooth faced intake housing, limited to a 3.6" inlet, (no map ring) with all air entering through the 3.6" opening. Intake wheel must protrude 1/8th inch inside of opening.
    5. ntercoolers are allowed.
    6. Diesel fuel only. (see Fuels for specs) No propane or NO2 permitted or any other oxygen enhancers.
    7. Water injection is permitted. prohibited. All system components must be removed from the truck.
    8. All inline turbocharged engines are required to have one cable that must surround the engine block and head. This cable must be placed between first and second cylinder through exhaust manifold port area.
    a. Cable must be a minimum of 3/8-inch thickness.
    b. Cable must have a minimum of (4) clamps at the splice.
    c. Cable must have no more than 4 inches of slack.
    9. 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 6” of the turbo.
    D. Driveline/Driveline Shielding
    1 .Drivetrain will consist of any front axle, transmission, transfer case, rear axle permitted. No planetaries permitted
    2. All clutches, belhousings and automatic transmissions must comply with the SFI specs and rules covered in General rules.
    3. Vehicle must have three (3) round metal loops shielding metal loops).
    a. 360 degree loop must be a minimum of 3/8-inch aluminum or 5/16-inch steel, 3/4-inch wide (or wider) and not more than 2 inches from the shaft in any direction.
    b. End loops to be placed no farther than 6 inches from universal joints, with third loop in center of shaft.
    c. May use a solid tube (3/8-inch aluminum or 5/16-inch steel) to meet the above requirements.
    E. Hitch
    1. 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.
    2. No hitch supports or adjusters, if fastened to the rear axle housing shall be above the centerline of rear axle. Pivot pin of drawbar can be no farther forward than centerline of the rear axle. 
    F. Tires
    1. Must be D.O.T. approved tire. Maximum tire height 35” no studded tires or chains. No alteration to tires allowed. Dual rear wheels are permitted.
    2. 34‐18.00‐15. Bar & cut tires permitted. Maximum tire size to be 112 circumference, when inflated to 30psi with original bar, not to exceed 18 inches in width before cutting. Maximum of four tires permitted.
            Note: All four corners must be same type tire, no mixing Bar and DOT tires.

Tech Questions and Answers

Rollcage Webbing

Question:
Mr. Richwine,

I am building a Mini Rod and have a question about the webbing between the upright tubes? Can they be lightened? If so, how much? I have included a photo of the chassis that is available and they look like they have been lightened a lot.
webbing

Answer:
Yes the shear webbing that goes between the up tubes can be lightened by 40%.
The Spec says: shear web may have lightening holes but must retain 60% material and must have a minimum of 1 inch around the perimeter of the web on all four sides. This applies to both Mini Rods and Big Tractor rollcages.
After looking at the photo you are correct this will not pass the SFI / NTPA inspection and will have to be corrected before they are allowed to compete with NTPA.

New tires

Question:
Richwine, How big can of a tire can I use in the Super farm class? These new tires that are out are pretty big.
What if I buy a pair and they measure 212-214 inches?
The guy selling them that they are ok but, I don’t wanta get throw out if I show up with them.

Answer:
The rule reads:
24.5 x 32 with a maximum of 210-inch circumference, when inflated to 10 psi. Tread width not to exceed 25 inches.

I realize that after hardening, over inflation and use they will stretch some but, if we measure your tires when they are relatively new and they’re to big, you would be allowed to run that day but told not to come back till you have tires that fit the rule…….

Bottom line is make sure you get tires that are legal.

Rollcages in New York

Question:

Mr. Richwine,
I'm not a mamber of NTPA but, would like to run at the upcoming event in New York. I need to get my cage inspected, is there a charge for that?

Answer:
Here's the program that's been in place since 1999 when the cage was implemented.
All vehicles that compete at a NTPA event must have the rollcage inspected and display a NTPA/SFI certification sticker or the vehicle will not be allowed to hook.

1. Upon passing inspection and paying the fee of $75.00 per cage to NTPA on vehicles that have a paid NTPA membership. The rollcage will have a certification sticker applied to it that denotes the inspection date, it will be valid for a period of five (5) years before being required to have their rollcage reinspected. Unless an accident occurs that involves the rollcage.
2. A service fee of $100.00 will be added to a cage that is on a non NTPA member vehicle. This $100.00 fee will be applied to a regular membership (not per hook) if the vehicle joins NTPA within a 60 day period from the date of inspection.
As for dates other than the April 8th date that has been scheduled in NY the next available dates would be at Millers Tavern, VA May 13 or Pinetops, NC on May 19-20
Note:
This is not something that can be done at the event because there will not be a "rollcage inspector" there due to scheduling conflicts.




Contact Info

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