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Old 04-03-2011, 10:22 PM   #18
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Join Date: Nov 2009
Location: Connecticut
Posts: 1,073
My Ride: 2005 ZHP TT Stg 1
Originally Posted by Iceman00 View Post
So the 2.5's are good? And why is this?
The M54B25 is oversquare so I guess something to do with its [cast construction, ]comparatively shallower crank bends and [perhaps] the resultant 'lower piston speed relative to engine speed' keep the harmonics from really going.

Originally Posted by jacobs323i View Post
how about a 2.5 that has the 330 crank in it?
I'd say it's in the same boat as the 3.0 liter engine.

Originally Posted by mrshelley View Post
If you are going to run occasional track days with a regular 330, then you are fine. If you are going to put some serious time on it (5 to 6 hours per weekend) then you might want to look at this option. Most people don't run their car on the track flat out for long periods of time. If you do, just beware of what can happen.
Great guideline^

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Last edited by McSpeed; 04-08-2011 at 01:49 PM.
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