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Old 11-08-2006, 07:26 PM
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All I see is copper...

400 sbc. previously lined bored, bored .020 over ,crank cut .010, thrust rebuilt. tore down tonight and all bearings show copper on at least one side( some both). on rods all bearings show copper on on piston side of rod, with small grooving on cap side, but no copper. and on mains, copper is on main cap side of crank. what the hell happened? tons of oil pressure before i tore it down. originally thought i had burned a ring(moly rings) and im pretty sure i did. will try to get pics up tomorro, but what does this usually occur. only bearings with no copper on either side was #5 maincap.i built the engine so any questions can be answered.

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Old 11-08-2006, 09:02 PM
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Did you scrub the bores before assembly and check them afterwards several times to be assured there was no hone dust still impregnated in the cylinder walls?
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Old 11-08-2006, 09:03 PM
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Please provide:
Squish measurement
Combustion chamber volume
Head gasket thickness
Deck height
Piston crown arrangement (dish, flat, dome)
Intake closing point on camshaft
Was cam installed straight up
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Old 11-09-2006, 07:51 AM
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With out pics, I'd say contamination.
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Old 11-09-2006, 09:43 AM
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Did you plasti-guage for tolerance before buttoning it up.
I have seen good machine shops make critical errors in turning a crank down.
If the leave to much material you will not have enough room and metal will rub.
We always check tolerances at torque specs. It sucks to take it back apart to check it, but then you are certain it is right.
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