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Old 03-27-2012, 03:56 PM   #16
PEI330Ci
58mm of Bliss
 
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Join Date: Jul 2003
Location: PEI,Canada
Posts: 3,935
My Ride: 330i, 330Ci
I think that while the aluminum block is a factor in harmonic amplitude, it's not the cause. That still comes back to crank design...in this case the 89.6mm piece which was originally designed for the iron block USA S52 engine.

The 2.8L cranks seem to have less issues...especially on higher HP builds.

I seem to just like throwing $$$ at any and all problems....so I'm probably not the most economical person to have a discussion with on this topic.
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