small block HELP...keep spinning the same bearing

[Gaz64]

Did the engine builder wash the new crank and check for fluid flow through all of the oilways? As others have mentioned, either rubbish in the channel between your failed bigend and the adjacent main that feeds it, or insufficient crush on the bearing.

Did he measure bearing crush? I've dealt with an engine reconditioner that doesn't understand that term.

1 thou per inch of pin diameter is acceptable for bearing clearance.

[JohnM]

Hello All

Latest update.....I am not sure if this is blowing smoke or for real, but the current therory is a bad crank...its a new crank from SCAT, just a cast model

We originaly wanted a Eagle but couldn't get it in time so went with the SCAT

Anybody know anything about their quality etc on the cast models.

It didn't seem to be an oil supply problem...no discoloration from heat, no turning blue etc....

The builder is eating the crank...maybe it can be warrantied....45-60 minutes on the engine I picked up for the new connecting rods...he's doing all the labor, bearings, gaskets cleaning etc. etc.

I feel he is doing right by me

Any thoughts on the crank...I still think it was the connecting rods

John

[CobraEd]

OK, . . . . But what about the crank is wrong?

Journal too big?
Journal too small?
Journal not square side to side?
Journal out of round?
Journal stroke longer than the rest?
Oil passage too small?


It is fine to say it is the crank, but you should know WHY it is the crank, or you are shooting in the dark.


Ed

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