Beginnings of a Wiki, feel free to improve
RPM = Rotations Per Minute
With regards to cars, this is most often used as the measurement of the complete revolutions of an engine's crankshaft, which would have all of the cylinders of the engine fire once. This is most often monitored by a tachometer.
Because of recent spam attacks on Mediawiki sites by the tens of thousands of spammers concerned with the length, girth and hardness of our Johnsons, we have had to temporarily disable new registrations and editing until measures can be taken to ensure there is no further vandalism of this site. We apologize for the assholes out there that don't have better things to do, and will find a work around soon. Meanwhile, there are still thousands of MoparWiki pages containing a wealth of information.