L92 Oil Bypass
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Teching In
Joined: Aug 2006
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L92 Oil Bypass I'm going thru another L92, I have been removing the VCT and the cam the cam have oil passages in the 2nd bearing journal for the VCT. Anyway the L92 oil pan has a oil press bypass. Does anybody know what pressure this bypass is set for. I'm going to remove it however I have also noticed the oil pump press bypass has a much heavier spring then the LS1,LS2 and LS6. So I assume it requires more oil pressure to operate the VCT! The next L92 I build I will leave the VCT on it for dyno testing I will post the results! Has anybody on this site removed the L92 oil pressure bypass or do you just leave it. I’m concerned after removing the VCT which requires more oil, the motor will build to much oil pressure for the bypass and the bypass will dump oil and starve the motor!
Thread Starter
Teching In
Joined: Aug 2006
Posts: 9
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Well it appears by the oil passages to be a oil filter bypass which makes perfect since because GM insists on using that silly wanna be oil filter. I’m sure they lost a few motors to warranty because of a plugged filters so they added a bypass. I’m going to run the motor tomorrow on my test stand it will be interesting to see what the oil pressure will be after removing all the VCT and the cam that diverted oil to the VCT’s valving. After seeing how much larger and stiffer the L92 oil pump bypass spring is I bet it will have 60 or more pounds at idle with synthetic.
Mine was months ago by W2W. I have a nice box of all those parts you speak of. 
I can't say I know a ton about it but we did replace the oil pump with a ported LS6. The reasoning was the volume of oil (or pressure, I'm not sure) was too much or not needed. Other part of the reasoning was why risk playing with it when we know what works and proven already.
I can't say I know a ton about it but we did replace the oil pump with a ported LS6. The reasoning was the volume of oil (or pressure, I'm not sure) was too much or not needed. Other part of the reasoning was why risk playing with it when we know what works and proven already.
