On 2016-12-12, wrote:
On Sun, 11 Dec 2016 16:00:08 -0800 (PST), Christopher Tidy
wrote:

Am Freitag, 9. Dezember 2016 23:41:14 UTC+1 schrieb :

Every make you mentioned uses plain shell bearings. Very few engines are built with roller crankshaft bearings today, and those are, as far as I know, all small, high-performance 2-strokes. Even they may have switched; I haven't kept up.

Ed, do you know what metal is used for those plain shell bearings? I'd be interested to know.

Thanks,

Chris
Quite a few use aluminum alloy bearings - some on steel backs. Some
use the same tri-metal bearings used in 50s and 60s cars - steel ,
copper, and "babbit" type bearing surface.

And a failed bearing of that type is a "runny babbit". :-)

Enjoy,
DoN.

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