M90 Designation
When an internal combustion engine pulls in air, it loses horsepower because of the effort. A supercharger, being an air pump, pushes air into an engine. The amount of air Eaton superchargers moves is in the name. In essence, Eaton superchargers are designated by the amount of air it pumps. For the M90, it moves 90 cubic inches of air per revolution of its shaft. Suppose an engine is turning at 1,000 rpm. With a pulley, the supercharger might be spinning at 1,500 rpm. Multiplying 1,500 rpm by 90 yields 135,000 cubic inches per minute of air being pumped into the engine.
Read more: Specifications of the Eaton M90 Supercharger | eHow.com
Specifications of the Eaton M90 Supercharger | eHow.com