No & No. There are several reasons to explain this. Any aluminum crankcase engine must have a sufficient radial play amount in the cold bearings to provide enough end play or axial play amount (.005" to .006"), after the bearings are mounted in the case & on the crankshaft. This compensates for the greater growth of the aluminum front end compared to the steel crankshaft as the engine heats up. Failure to have this cold end play amount will cause bearing failure! After many precisely controlled tests we discovered that bearings with to little radial clearance failed rapidly & bearings with large amounts of radial play continued to run. Types or amounts of lubricants used had little effect on this. Gimmicks such as special cages (phenolic machined types, riveted steel types, crimped brass or steel types), do not help when the cold radial clearance is insufficient!!
All steel front ends cannot be compared to aluminum front ends with a steel crankshaft because all the parts involved in the steel front ends are made of steel! In some all steel designs the inner race of both front bearings are mechanically fastened together to the crankshaft. This allows positive control of the cold end play amount (axial end play amount), which remains the same, because all of the parts involved are made of steel!
Edited by Jim Allen, 11 January 2018 - 10:31 AM.