Quote:
Originally Posted by 92stealth15g
Was the engine broken in properly? I have heard if you hot rod within the first few hundred miles of a rebuild you will have problems and spin bearings real quickly.
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Rod bearings and breaking in an engine have nothing to do with each other. A rod bearing does not break in. It has no idea if you have 1 or 10,000 miles on the engine (sans the extra wear it will have).
The only part in the engine that needs to be "broken in" on a fresh engine are the rings. Once they are seated it is broken in and can be pushed as hard as you wish {given the builds ability and tuning}
Personally I break in engines hard and have never had a ring seat issue.
But that is controversial.
Rod bearings fail for many reasons.
Oil contamination
Lack of oil/heat
Detonation
Improper engine build (replacing bearings on a spun journal without getting journal fixed, improper turning of crank after spinning bearing and other bad building techniques such as improper specs, non use of assembly lube etc)