Pro Modified
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Pro Modified, also known as Pro Mod, is a class or division in the sport of drag racing which began in the IHRA sanctioning body.
[edit] Overview
This division has specific rules about engines, components, bodies, etc. Pro Modifieds can either be raced on 1/4 mile or 1/8 mile tracks. Pro Modified has only been around for about 15 years, whereas other classes are much older. Despite this, it has become one of the most popular divisions of the sport. The Pro Modified division was a spin-off of the IHRA's Top Sportsman division but with fewer limitations, allowing for significantly higher performance.
[edit] Engines
The rules of engines in Pro Modified are simple and straight forward. The engine can either have up to 527 cubic inches and be supercharged and methanol fueled, or it can have a larger 820 cubic inch engine that utilizes nitrous oxide and gasoline. Turbocharged engines will be permitted for the 2008 IHRA season. These engines put out an extremely large amount of horsepower, some at approximately 2500 H.P. The engines propel the cars down the track at speeds of over 200 mph. There are weight limits, according to the type of engine used, 2375 lb. for nitrous powered cars, and 2700 lb. for supercharged (or blown) cars. Most supercharged engines are based on Chrysler's 426 Hemi engine.
