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Old 19th July 2010, 16:31   #1
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Default Use of RPM

Being a newbie to automobiles I am asking this question which many of you will find stupid.

Pardon me if you find this question too kiddish.
"What is the exact use of RPM and what all can i do by determining RPM?"
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Old 19th July 2010, 17:11   #2
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Hi Sid... welcome aboard!

RPM is Revolutions Per Minute, the rate at which a spinning object is moving. By determining the rate of that spinning object (like crank shaft, wheels, gears, pulleys) one can base combined mathematical calculations to find out speed, rate of change of momentum, gear strength, maximum power/torque curve depictions, tolerances warning charts etc

Hope the above helps...

Last edited by The Wolf : 19th July 2010 at 17:12.
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Old 21st July 2010, 22:15   #3
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i think you meant by usage of RPM meter on dash of some cars.?
They are commonly called RPM meters, or more technically Tachometer.

In simplest of terms it tell you when to change gear to get maximum efficiency from your engine. Basically most tacho has a red bar after some numbers. This is called redline. Ideas is to drive in such a way that not to let the needle enter that area.
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