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Old 02-27-2009, 02:21 PM   #16
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Originally Posted by jatoman1992 View Post
does anyone know i heard that there was a .21 motor that has a 48000 rpm limit
I guess it would be best to know why you're asking. The RPM ratings on most engines are very unrealistic estimates that could virtually never happen in actual use. The highest RPM I've ever seen is from a .21 on-road Sirio engine on a LONG straightaway, which was just a tick over 50,000 rpm measured by an audible tachometer. It measures the "frequency" of the exhaust and can be an accurate measure of engine RPM when properly used. If you've ever heard an engine run at that kind of RPM, you'd know how rediculous these kind of claims are when referring to off-road engines - they never get even close. Most high-performance off-road engines peak at roughy 35K, MAYBE up to 40K. If you're asking out of curiousity, then that's roughly the limit; if you're asking because you want to buy the fastest engine, pay no attention to claimed RPM.
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Old 02-27-2009, 04:26 PM   #17
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I've had multiple OS speeds and RB C6BBT7's, and I can say with 100% confidence the RB makes more raw power and has a higher RPM than the speed. Those RBC6 engines are ridiculous on the top end. However the Speed is a better offroad race engine because it has a better power band.
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