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Old 07-21-2012, 03:10 PM
roadsta roadsta is offline
Officially Welcomed to the 'Fest
Location: Brisbane, Australia
 
Join Date: Dec 2011
Posts: 117
Mein Auto: 2012 650i MSport Coupe
power and torque

In the end, it is always about power.

Revs x torque = power. (In the same way that force x speed = power, in a linear situation.)

So, torque in part determines how much power a car has, but it also depends on the revs at which it can produce that torque.

An engine that produces high torque, but runs out of revs quickly, cannot keep up with one that has similar torque but can rev higher.

A classic is a Formula 1 engine - nowadays a 2.4 liter V8 without turbos. It produces lower torque than a 650 or even a 640, but it can rev to around ~20,000 rpm - that's why they still produce around 800 hp from a engine that has less displacement than many small cars on the road today.

Power is the amount of work per time unit, and determines how much energy can be converted per time unit - how much speed can be 'added' in a given time.

http://www.epi-eng.com/piston_engine...and_torque.htm

r
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Last edited by roadsta; 07-21-2012 at 03:11 PM. Reason: typo
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