Supercharger porn

[Jonny69]

A bit of supercharger porn lifted off the NSRA forum. These guys are about to test their new 18-71 blower, that's a Top Fuel supercharger if memory serves. Check out these mad rotors:





http://www.dmpeinc.com/current_engineering.php

Bit of info about superchargers which I think I've got correct: The number before the '-71' denotes the size of the supercharger. I think originally the 71 referred to a cylinder of 71 cubic inches capacity and the first set of numbers was the number of cylinders of that size the supercharger could supply. So a 6-71 Roots blower is suitable for an engine up to 6 x 71ci = 420ci or about 6 litres.

The maximum size allowed on an engine in Pro Modified is a 14-71, that's your 2400hp engine. Maximum size allowed on a Top Fuel / Top Alcohol is a massive 18-71, but these are nitro and methanol engines with much bigger breathign requirements. Top Fuel engines typically develop over 5000hp from an 8-litre supercharged V8 running on nitromethane.