Climate Feedback. Ocean Acidification. Rising Sea Level. RPM 4-stroke internal combustion engine. Figure 1. An internal combustion engine has a number of RPM, based on the number of times that it goes through a 'cycle'. RPM - for Revolutions Per Minute - were once a larger part of the motoring game, quoted from start to finish, analysed and adjusted, compared, calculated and hot-rodded.
In the right gear ratio, high RPMs bring more power and road speed. Engine torque - the pulling power for getting away from the lights or lugging over big rocks - is found a bit lower in the rev range. High revs in a low gear is for acceleration, high revs in a high gear is for road speed. Spirited drivers once had to watch the redline - where the numbers went from black to red - on the tacho.
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