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To: Ali Chen who wrote (56859)	10/2/2001 2:01:58 PM
From: pgerassi	Read Replies (1) \| Respond to of 275872

Dear Ali: The Dynamometer is a device that hooks up to the engine under test, usually by hooking the engine output shaft to it or by attaching it to roller pairs that the car's driving wheels roll above and between. This device takes usually one of two forms, the simpler form is a torque sensor, a RPM sensor and a brake cooled by some means. The operation is simple, you run the engine at a certain RPM and you apply the brake more and more firmly until the engine can no longer maintain the set speed. The more useful version uses an electrical generator instead of a brake. Torque output is sensed by current and RPM by voltage (with correction curves used to linearize the values). Torque requirements (brake force) are determined by field current to the generator and a computer then can put an engine or car through its paces to give those speed-torque-power curves that you must have seen in those car mags or factory specs. There is a dynamometer in each of my states emissions testing stations to simulate a 35MPH road run. The unit of latter type above is called a "Dynamometer" or generator (Dynamo) based meter. Pete PS: The HP reading when you look from the wheels is always lower than by looking at the shaft (friction from the gears, torque converter, joints, bearings and differential). Matter of fact, SHP means shaft based horsepower, and BHP as brake (normally at the wheel) horsepower to separate the methods used to determine HP.