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Old 07-06-2009, 09:56 PM
Creative Engineering Creative Engineering is offline
Join Date: Sep 2008
Location: Clearwater, FL
Posts: 1,668
Default Re: Bushings VS bearings

It's all a matter of tolerances,

An engine with a sloppy needle bearing fit will not hold up compared to an engine with a properly honed bushing.

An engine with a sloppy bushing fit will not last. An engine fitted with a precision wrist pin and needle bearing will last.

You can't blindly compare the 2, because either design can be executed improperly.

Every time the engine's a hammer on top of the piston. If there is any play in the wrist pin to rod fit, the bearing material,(no matter what it is), will get hammered until it fails.

I prefer phosphor Bronze far all of my 2-cycles have had needle bearings. I haven't had the opportunity to do a longevity test on any of them...but my customers will!

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