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NoDOHC · 03-21-2009, 10:37 PM

I would have to dig my machine design textbook out, but I think that it is hard to beat a well-designed journal bearing. Roller bearings would probably give less resistance, but would they last as long?

I am sure that Mazda used journal bearings because they are so much less expensive than roller bearings, but I can't help thinking that there must be another reason.

I have yet to hear of any production engine that used roller bearings for the main journals or the rod journals.

03-21-2009, 10:37 PM	#3
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	I would have to dig my machine design textbook out, but I think that it is hard to beat a well-designed journal bearing. Roller bearings would probably give less resistance, but would they last as long? I am sure that Mazda used journal bearings because they are so much less expensive than roller bearings, but I can't help thinking that there must be another reason. I have yet to hear of any production engine that used roller bearings for the main journals or the rod journals. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)