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NoDOHC · 01-11-2011, 07:47 AM

The big advantage to roller bearings is that they do not suffer accelerated wear for short periods of non-lubrication (if they get hot, it is a different story). This is good for starting (no oil pressure). The biggest problem with them is as stated above, there are more wear parts than just the oil film. Thus changing the oil does not completely replace the wear items in the bearing. The journal bearing is truly awesome for longevity under high loads and high speeds.

The picture that is shown is from a small air-cooled rotary that has no pressurized lubrication system (mixed oil in the gas). This is why the roller (or needle) bearing is required.

01-11-2011, 07:47 AM	#12
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	The big advantage to roller bearings is that they do not suffer accelerated wear for short periods of non-lubrication (if they get hot, it is a different story). This is good for starting (no oil pressure). The biggest problem with them is as stated above, there are more wear parts than just the oil film. Thus changing the oil does not completely replace the wear items in the bearing. The journal bearing is truly awesome for longevity under high loads and high speeds. The picture that is shown is from a small air-cooled rotary that has no pressurized lubrication system (mixed oil in the gas). This is why the roller (or needle) bearing is required. __________________ 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) Last edited by NoDOHC; 01-11-2011 at 07:49 AM.