Quote:
Originally Posted by John V
It can tolerate more than that once you add an oil pump chain tensioner and a decent crank damper, but I'm guessing that's not legal in the Spec class. And it doesn't make power up there anyway.
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I don't think that the damper is, although aftermarket oil pump setups are legal, and I *think* the tensioner is as well. IIRC, in race form, high RPM durability of the M54 remains iffy even with all of that. There's a huge difference between occasionally touching the rev limiter and running it out in 4th gear.