NHRA - National Hot Rod Association


An introduction to NHRA's pro classes

New to the NHRA? Get to know the four professional classes in our Mello Yello series right here.
16 Jul 2018
NHRA National Dragster staff

The NHRA hosts four professional classes in the Mello Yello series, including Top Fuel Dragster, Funny Car, Pro Stock, and Pro Stock Motorcycle. You can learn a little bit about each of them below, including technical specs, who took home the championship last year, and more.

2017BT1_MG_0879.jpgTop Fuel

Chassis: 4130 chromoly tubing; wheelbase can vary between 280 and 300 inches. Center-mounted driver sits in front of the engine.

Body: Attached to the chassis with quick-release fasteners, the lightweight multipiece body and cowl are typically formed of metal, fiberglass, or carbon fiber/Kevlar.

Minimum weight: 2,330 pounds, including driver.

National speed record: 336.57 mph, Tony Schumacher, Phoenix, Ariz. Feb., 2018.

National elapsed time record: 3.631 seconds, Clay Millican, St. Louis, Sept. 2017.

2017 Champion: Brittany Force

What to watch for: Bruno Massel explains how the wings create the all-important downforce for a Top Fuel dragster:

2017HT1_MG_3378.JPGFunny Car

Chassis: 4130 chromoly tubing; maximum wheelbase of 125 inches. Center-mounted driver sits behind the engine.

Body: Carbon-fiber replica of a 2000 or later model NHRA-accepted coupe or sedan of a type originally mass-produced by an automobile manufacturer. 

Minimum weight: 2,585 pounds, including driver

Rear spoiler: Capable of applying 6,000 pounds of downforce to the rear tires

National speed record: Robert Hight, 339.87 mph, Sonoma, Calif., July 2017

National elapsed time record: Robert Hight, 3.793 seconds, Brainerd, Minn., August 2017

2017 Champion: Robert Hight

What to watch for: Tony Pedregon explains how the chassis of a Funny Car is put together:

2017AG1_RA_4147.JPGPro Stock

Chassis: 4130 chromoly tubing; maximum wheelbase of 105 inches. The driver sits in the standard passenger-car position.

Body: Pro Stock bodies are composite replicas of their two- and four-door showroom counterparts. All body components must comply with the shape of stock components. Doors must be functional and operable from inside and out, and headlights, parking lights, and taillights must be stock-appearing.

Minimum weight: 2,350 pounds, including driver

Engine: Restricted to a maximum 500-cid, single-camshaft, 90-degree V-8 of the same corporate make as the body. Air, fuel, and ignition are controlled via an NHRA-specified engine-control module, eight fuel injectors, eight coil-near-plug modules, and a throttle body.

National speed record: Erica Enders, 215.55 mph, Englishtown, N.J., May 2015

National elapsed time record: Jason Line, 6.455 seconds, Charlotte, N.C., March 2015

2017 Champion: Bo Butner

What to watch for: Unlike it's Nitro counterparts, Pro Stock drivers have to shift four times during a run. Reporter Bruno Massel explains breaks down the process:

2017EN1_JF_01236.jpgPro Stock Motorcycle

Chassis: 4130 chromoly steel tubing, maximum wheelbase 70 inches.

Body: Aerodynamically enhanced replica of the original body following many production dimensions, and it is made from either fiberglass or a carbon-fiber composite.

Minimum weight: With few exceptions, Pro Stock Motorcycles must weigh no less than 575 pounds (625 for 160-cid two-valve Harley-Davidson V-Rods; 625 for 160-cid two-valve Buells, Victorys, and EBRs; 600 for 113-cid two-valve Suzukis; 595 for up to 107-cid two-valve Suzukis; 575 for up to 107-cid two- or four-valve Kawasakis) with the rider aboard.

Engine: The majority of racers use the V-Twin style or inline four-cylinder Suzuki or Kawasaki. NHRA-accepted fuel injection is permitted on all engines. 

Fuel: High-octane spec racing gasoline.

Tires: The rear slick is 10 inches wide and 26 inches in diameter and is designed specifically for motorcycle drag racing. The front tire is a lightweight, treadless design that aids braking. Air pressure is 5 to 6 pounds on the rear tire and 30 to 32 pounds on the front.

Brakes: Three aftermarket carbon-fiber-composite or steel brake discs, one or two on the front and one on the rear. Parachutes are not required.

2017 Champion: Eddie Krawiec

What to watch for: Tony Pedregon explains the unique ride the Pro Stock Motorcycle category offers.