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Old 05-14-2008 | 10:57 AM
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DarZeelon
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From: Rosh-HaAyin, ISRAEL
Default RE: Piston Damage

ORIGINAL: Sport_Pilot

For that matter, chromium (true ABC) has a Rockwell C hardness rating of 68-74...
But that doesn't flake. Though nickel is softer, I think it may be hard enough to do some damage, maybe not right away. All it really has to do is jam up the balls so that they slide instead of roll. After a time this will ruin a bearing.
True, Hugh.

Chromium is much less prone to flaking off, because its bond to the brass/aluminium sleeve is very strong...
Each of its 'islets' is sitting very firmly on the surface.

The damage you describe with nickel is possible in theory, but usually, flaked nickel is not carried back into the crankcase, but rather spewed out the exhaust, or lodged between the piston and the sleeve...

And yes, sliding balls in bearings will noticeably shorten their term...
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