Use of RPM

sidd25 · 19th July 2010, 16:31

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?"

The Wolf · 19th July 2010, 17:11

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...

SirAlec · 21st July 2010, 22:15

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.

19th July 2010, 16:31	#1
sidd25 BHPian Join Date: Oct 2009 Location: Pune Posts: 135 Thanked: 7 Times	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?"
	() Thanks

19th July 2010, 17:11	#2
The Wolf Senior - BHPian Join Date: Jan 2005 Location: Bangalore Posts: 1,118 Thanked: 71 Times	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.
	() Thanks

21st July 2010, 22:15	#3
SirAlec Senior - BHPian Join Date: Sep 2006 Location: zxc Posts: 3,393 Thanked: 726 Times	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.
	() Thanks