My car idles around 600 RPM which is equal to about 10 cycles per second and redlines at around 6,000 RPM which is 100 cycles per second. This just seems like a more friendly scale to use. I am curious why we use RPM instead of Hertz to measure engine speeds.
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Note that, in physics, the standard unit for rotational speed is not Hertz but radians per second. If you multiply your engine speed in radians per second by your engine torque in Newton metres then the result is your engine power in Watts, without any messy conversion factors.
There are 2π radians (about 6.3) radians in a revolution and 60 seconds in a minute so 1000 RPM is very roughly 100 radians per second.
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