:The wear pattern is consistent with detonation wear caused by running too much boost for the state of tune combined with the octane of fuel being used.
:The center cyl's always see the most heat because the outside cyl's transfer heat to the center cyl's as well as the heat made by the center cyl's.
:When a cyl runs hotter it detonates easier.
:Every Z I have ever seen that has had rod bearing failure from detonation (With or without a Pulley) has failed on one or both of the center cyl's. I agree with Greg 100% and his experiance mirrors mine as well. Mike
:The only reason pistons #5 and #6 melt first is because the thickness of the #5 and #6 cly wall to water jacket is thinner.
:The only reason VG30 engines have rod bearing failure is because too many people think they can run crazy boost levels on pump fuel.
:I have never seen a VG30 turbo motor have rod bearing failure or have premature bearing wear while running reasonable boost levels for the octane of the fuel being used with or without a harmonic balancer.
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