Quote:
Originally Posted by FullBlown
There are too many variable to what could cause bearing failure. Here are some..
-improper bearing clearance
-wrong weight oil for bearing clearances
-thermal breakdown of the oil
-unbalance rotating assembly
-motor not up to temp before heavy load
-detonation
Im sure there are more issues that could cause bearing failure. A properly tuned/built motor, should not have bearing to crank contact. A crank should glide between the clearance of the oil pressure, and never ride the bearing.
You can take any high end bearing in the world and pound them out with detonation. If you ignite the fuel and maximum cylinder pressure happens at or near TDC. It will force the rod down, and squish the oil out and wear/flatten the bearing.
A higher grade bearing will withstand that abuse longer but, its only a bandaid for the disaster that is coming if you do not address the actual problem.
Keep in mind, Oem bearings are alot better than they were years ago. We have ran oem bearings in many different platforms. I'm not saying that they are identical in quality to other makes but I wouldn't be quick to blame the OEM bearings.
ACL will eventually make a drop in bearing and we will more than likely use them but until then... We just don't feel the need to experiment with other bearings that weren't made for this motor.
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Do you guys use a torque plate when machining?