Subject	'valve float' is first most common problem.
Posted by	nixit on July 15, 2003 at 1:27 PM
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In Reply To	How is the redline limit determined? posted by shirow on July 15, 2003 at 12:40 PM
Message	if the cam is rotating too fast, the valve will not reseat properly, allowing compressed air to leak. generally, they change cam profile and valve spring rates to compensate for valve float. but when you increase RPMs, you have to have a custom grind to get enough air into the cylinders to prevent going lean. it's not a simple a=b. it effects everything else in the line of duty tho, so it's not just a single 'mod'
Follow Ups	How is the redline limit determined? - shirow 12:40:33 07/15/03 Dependent on cylinder configuration, bore/stroke, valvetrain - U ZCREAM 12:49:10 07/15/03 Don't forget tolerance and balance of parts (n/m) - NytWolf 13:11:19 07/15/03 I think trial and error woudl be too slow: - therinL 12:57:20 07/15/03 'valve float' is first most common problem. - nixit 13:27:35 07/15/03 Umm... - therinL 14:41:58 07/15/03 Not always smashing a valve. true valve float begins - RT 15:00:07 07/15/03 Actually, it has more to do with the valvetrain design >> - ChristopherTheOne 15:44:10 07/15/03 Thanks guys, great answers. (n/m) - shirow 18:08:41 07/15/03 You also have resonant frequencies to worry about - NATAZ 14:36:05 07/15/03 The Tacoma Narrows Bridge comes to mind (n/m) - U ZCREAM 16:09:24 07/15/03 when you stop making power ;) (n/m) - Sweet Z(UTAH) 16:22:15 07/15/03
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