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350HP930's Avatar
 
Join Date: Jun 2003
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3.2 / 3.3 Rev Limit ?

With upgraded rod bolts and a tweaked valve train whats considered the safe upper limit on the 74.4 stroke motors?

It looks like I will be going with some super cup cams so the valvetrain will have to deal with some additional lift.
Old 02-15-2005, 05:21 PM
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I surely would not exceed 7200 RPM using better rod bolts, valve springs & retainers.

With aftermarket rods and some lower end oiling mods, you can safely go to 7800+.
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Old 02-16-2005, 06:30 PM
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Thanks for the info Steve. I guess I will set the rev limiter to 6800 for a little extra safety margin.
Old 02-16-2005, 07:01 PM
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Steve, what would you say to the same question on an SC based build? TIA.
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Old 02-16-2005, 07:44 PM
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Quote:
Originally posted by 350HP930
Thanks for the info Steve. I guess I will set the rev limiter to 6800 for a little extra safety margin.
LOL,..You and your pocketbook will be happier for that decision,..



Andy:

A stock SC's bottom end is safe to 7200 however the OEM SC cast pistons are not. If you are using CIS pistons, keep the revs to 6500.

The forged Mahles are good well beyond 7800,.....
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Old 02-16-2005, 10:32 PM
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There is no point revving turbo motors past 6500 RPM...they usually make max power around 5500 (as long as there are no hot cams involved), reving past that is good only for "matching revs" for next gear.

Most of time, it just ads more noise and streches rod bolts :-)
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Last edited by beepbeep; 02-17-2005 at 09:16 AM..
Old 02-17-2005, 03:24 AM
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Excellent point. Unless the engine has been 'leaned-on' with good upgades, max Hp and Tq have already been reached BEFORE the redline.
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Old 02-17-2005, 07:28 AM
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