Funny Car: Difference between revisions

 

The NHRA has strict guidelines for funny cars. Most of the rules relate to the engine. In short, the engines can only be [[V-8]]'s at 90 degrees. (The most popular design is loosely-based on the 426 [[Hemi]].) There can only be two [[poppet valve|valves]] per [[cylinder (engine)|cylinder]] and [[supercharger]]s are restricted to a basic Roots type—19 [[inch]] (483 mm) rotor case length with a width of 11.25 inches (286 mm). The [[engine displacement]] can be a maximum of 500 in³ (~8.2 L). Only single [[camshaft]]s are allowed. There are two common bore-stroke combinations: 4.1875 × 4.50 inches (106.4 × 114.3 mm) (called a ''3/4 stroker'') and 4.25 × 4.375 in (108.0 × 111.1 mm) (called a ''5/8 stroker''). The 3/4 stroker is the most common combination used today and equals 496 in³ (8.1 L).