Originally posted by digger
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would you use this crank???
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the smoother it is, the thinner the oil film can get (more load capacity) before you get metal to bearing contact because the peaks on the surface are genrally smaller. note that RA doesn't explicitly define the peaks but its the most common used. when people look at honing there are a whole bunch of other terms to properly define the surface valleys and peaks
Smoother also does less damage to the bearing on cold/dry start where the oil isnt flowing very well yet or you have lack of lubricaton from giving the engine too much rpm and load with cold (thick) oil
some places also do REM and super finished cranks but that has other benefits besides journal performanceLast edited by digger; 03-23-2017, 05:49 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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