New answers tagged rpm
60 seconds. RPM stands for Revolutions Per Minute. if you have one RPM then it takes 60 seconds to do a complete revolution. Now there are ways to convert from RPM (Revolutions Per Minute) to seconds per revolution or other such measurements as mentioned in other answers however they do not answer the actual question asked of how fast one RPM is.
This is a math-only question, and no one has explained the formulas. Also I like the idea of this simple question having multiple answers so... RPM is Revolutions Per Minute, but we want a time in seconds. When you hear that word "per" it means division. So, what we have is 4000 revolutions / 1 minute (where / is the division symbol). This easily ...
Divide the measured RPM by 60 gives the number of revolutions per second. For an engine at idle that would be about 12 revs per second. At a 7500 rpm redline it is 116 revolutions per second. Combustion engineering is done in degrees of crankshaft rotation and milliseconds.
In a car rpm are very often shown. From experience you might know that for a normal car it varies between 1000 and 3000 rpm for normal use cases. 3000 rpm = 50 rotations per second = 1 rotation per 0.02 seconds.
Paulster2 is right, varying the injection timing with respect to the engine crank angle timing is the main way to control the combustion process in a diesel engine. In a conventional gasoline engine (PFI or SIDI) fuel and air are largely pre-mixed before the spark event (which controls the start of the combustion process) which then leads to a fast ...
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