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Old 04-04-2011, 01:33 PM
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Rod/main bearings

I'm working on a claimer/budget deal. Small chevy, cast steel crank with large fillet. This crank is a bit fat on both the rods and mains journals 2.0995/2.456 and the bore sizes on the mains and rods are on the small side of spec. When you add these together I get only .0016 oil clearance using STD sized bearings. Cleviitte makes bearing .001 thinner(CB663HXN) with the needed chamfer/narrowed that will work but the total cash outlay is close to $200 for the rods and mains. Clevitte makes a much less expensive "P" series bearing in .001 thinner Configuration but doesn't have the chamfer. Any ever cut ther own chamfer in the "P" series or have any ideas about what would work?

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Old 04-04-2011, 01:55 PM
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You can get ACL bearings X size w/ big chamfers for around $100 from Competition Products

In a pinch I've chamfered P bearings but it's a pain but ... they did hold up without any issues.
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Old 04-04-2011, 02:07 PM
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So how did you chamfer your own?
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Old 04-04-2011, 02:53 PM
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Never mind. Clevitte does not make a .001 thinner bearing in the p series. Just the h series only.
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Old 04-04-2011, 02:59 PM
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Years ago I used to use an old connecting rod and a half round file being careful not to hit the main surface. Crude but effective.

Now if I have to I use have a fixture that clamps the two halves together and goes into a 3 jaw chuck in the lathe. It sorta looks like this:

http://www.rbssuperchargers.com/Stor...76&InfoID=3921

just homemade like a lot of tools engine guys have.
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