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bearing oil clearences

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Old Feb 28, 2012 | 08:12 PM
  #16  
Erik@MIL.SPEC's Avatar
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Originally Posted by evoboy2006
what is really good main and rod clearences im not runnning a balance shaft or oil squirters its 4g63 block
You may want to PM Aby and pick his brain.
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Old Mar 7, 2012 | 08:31 PM
  #17  
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thubs are you running the standard shell or the standard hx shell becuse i brought dial bore guage im around .0012-.0015 on mains with standard size with hx i will gett extra thousand of clearence rods are too small for my bore guage



Originally Posted by THUB
What I've always read is that looser is better, assuming you can get proper oil pressure. What type of engine are you putting together? On my 2.4 stroker, I did .002-.0023 on the mains and .0025-.0028 on the rods, with no oil squirters to divert oil flow. Using 20-50 VR1 I see 80 PSI before 2K RPM.
However, using an Evo block, and thus, oil squirters, you'd need tighter clearances to achieve proper oil pressure.
If you're just doing a drop-in piston setup, I'd use stock size main bearings, and .001 O/S rod bearings. The rods are smaller in diameter and put more stress on the oil film, so a thicker film is definitely more useful there.
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