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Alloy Under Drive Pulley and Rod Failure

I don't think so. The B230's were pretty well balanced, with good bearing placement, and low friction....
BUT
The 83? to 88 B230's were made with rods that were 9mm, which were 4mm thinner than the original 13mm rods. They also moved the bearings around with the thinner rods, then reverted to the original setup because it was less prone to rod failure. Was the engine from these years?

I'm not an expert on engine harmonics though, so someone who is much more expert than me will give you a better answer.






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