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To convert speed from meters per second (m/s) to revolutions per minute (RPM), you need to know the circumference of the rotating object. Without that information, it is not possible to directly convert mach 0.8 or 272.23 m/s to RPM. RPM is a measure of rotational speed, whereas mach is a unit of relative velocity to the speed of sound.
Your engine is not running or your "RPM gauge" is broken.
5500 rpm
122 cubic feet to rpm??
The RPM displayed by the tachometer on the dash refers to engine RPM, i.e. the crankshaft.