Quote:
Originally Posted by Draco-REX
An L6 is not natrually balanced. The pistons all fire in the same direction. And as mentioned a couple posts down, an H4 crank is a fraction of the length of a L6 crank. So there's less chance of a damaging harmonic occurring in an H4 crank.
Though I agree that Perrin's R&D is sorely lacking and often fraught with error. That's why I won't put a Perrin product on my car.
I doubt the non-damped pulley was the issue. The untuned CAI is a possibility, however a lean condition usually doesn't cause such a catastrophic failure.
I'm thinking either oil pickup or oil pump failure leading to a rod punching through the side of the block.
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L6, V12 and H6 are the only engines with natural primary and secondary balance afaik. H4 has primary but not secondary balance. The forces 'rock' it back and forth.
Either way, we still don't know, and my post was more to throw a little more sense into the people automatically exonerating the pulley. For reference, the ATI damper on my 7M (83x91 BxS) is different than the ATI damper on a 2JZ (86x86).
It would be really nice to get a definitive answer on the cause from Toyota.