OEM are tri and Clevites I believe are tri as well. The tri has copper layer that you see on engines that spun bearings or have excessive wear. bie metal has no copper on them. just aluminum and steel back plate. Aluminum can last longer and they can take the small derbies in the oil with out scratching the crank ,but they can't take power. trimetal bearings take more abuse. On bi metal bearings load taking very from 5000psi to 8000psi depending on the amount of silicon in aluminium. conventional metl bearings are somewhere between 8700psi to 10000psi. Race bearings can take even more with stronger back plates with thiner overlayer and more clamping structure as high as 18kpsi. Kings bearings has made tri material to withstand 18kpsi. Clevites made race bearings for our engines and they say it can hold 60% more load so i'm guessing somewhere in 16kpsi area. I wonder if we can get a hold of sputter bearings. They hold over 20kpsi, but they are popular in Europe.
this is the construction of most bi and trimetal bearings.
http://www.substech.com/dokuwiki/lib..._structure.png






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