entropy
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posted August 15, 2009 10:19 PM
chamfering main bearings?
Seems like I had a brain fart and missed the discussion on chamfering mains.
Osti had good luck doing it, and my mains look like Ryan's "before" pix.
Any tips?
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chavcat
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posted August 16, 2009 03:09 AM
Karl - I was told by a good engine builder this is what he does on all stroker motors to help keep the bearings alive.
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Y2KZX12R
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posted August 16, 2009 03:53 AM
Got a pic? Is the edge of the bearing rubbing on the fillet radius on the journal?
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entropy
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posted August 16, 2009 05:36 AM
quote:
Got a pic? Is the edge of the bearing rubbing on the fillet radius on the journal?
i will go look at them right now!!
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entropy
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posted August 16, 2009 05:51 AM
i looked at several main shells carefully under magnification and could see no evidence that the sides of bearings are rubbing on the fillet of the crank. In fact i was surprised to see a very pronounced chamfer built into the shell, i'd never noticed that before. I then compared the used shell to a new one and they seem the same.
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Y2KZX12R
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posted August 16, 2009 05:55 AM
Then your ok with the mains.
How about the rod bearings?
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Y2KZX12R
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posted August 16, 2009 06:02 AM
This very issue becomes EXTREMELY important on our SB2.2 engines with piston guided rods.
The connecting rods don't touch the crankshaft or each other at all. (V8, 2 rods on one crank journal)
The pistons are locating the connecting rod at the pin end. The big end just floats on the journal.
So you could see how a rod bearing rubbing on the fillet radius of the crank would be a MAJOR problem.
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entropy
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posted August 16, 2009 07:00 AM
quote:
Then your ok with the mains.
How about the rod bearings?
rod bearings look as good as they ever have.
I'm guessing i could re-use all bearings, but since I have some in stock, i'll replace em.
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