Originally Posted by namba209
One thing I learned during my A & P Engine class, Roller and/or needle bearings won't last in a large reciprocating engine. The compression and firing loads will flatten them if used in the big rod end.
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Ron help me out with this one
I'm not sure is the recip. mass or the rotating mass thats giving the problems or the bearing speed. I'm leaning on the bgr. speed large journal cranks have crazy bgr. speeds. Now if we keep the journals as small as possible then needle bgrs might work.
Talk about thread creap we go from a bad ace header to the crankshaft.