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Old 03-11-2012, 01:58 PM
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Originally Posted by loudandproud
so you all see nothing wrong with the bearing? Nothing im missing here?

I just fear the dreaded bearing spin...

If you have made certain that the bearing bores are round and tight and you tune the motor properly to stay out of detonation, you will be fine. Smokey Yunick discovered that when the motor detonates, the pounding that the crank takes is transferred to the bearings and they will curl up like a potato chip. When this happens, the edge of the bearing insert will wipe all the oil off the journal and the show is over. You can see the same thing happen if you beat a piece of metal with a ball peen hammer. It will begin to curl up.

Take a look at the parting lines on the inserts and you'll see that they have a slightly larger diameter than the rest of the insert. The bearing manufacturers began adding those cuts after Smokey's discovery. You can beat on 'em a little bit without wiping the oil off the crank journal, but if the motor really gets into detonation, you're done.

Last edited by techinspector1; 03-11-2012 at 02:13 PM.
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