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Main bearing failure- photos

Engine Building Fundamentals

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Any ideas what has happened with this main bearing? We noticed metal flakes in the oil filter and decided to take a look. The rest of the mains are ok, engine was running fine for 600 competitive km.

Bearing Photo

Bearing Photo2

Attached Files

Looks like surface fatigue according to this guide from Mahle:

Engine Bearing Failures.pdf

Yup - any other signs of detonation or pre-ignition? Another cause may be incorrect bearing type for the application - were these OEM or proper competition bearings?