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Good Evening gurus, I am having an issue with my L-series L30 motor. I have been chasing this issue for a long time. In short my motor will not be able to go over 40psi of hot oil pressure. I am hoping some of you might be able to shed some insight into this. Here is a table of the oil pressure when warm. Measurements were gathered using both my mechanical gauge and a custom electrical gauge using a 2% accuracy 150psi pressure transducer. RPM Oil pressure 1000 (idle) 12.5psi 2000 23.9psi 3000 30.2psi 4000 40.4psi 5000 40.6psi 6000 41.8psi 7000 (not attempted) 8000 (not attempted) From 1000 to 4000 rpm the motor has no issue following the rule of (10psi per 1KRPM). Past 4000@40psi the motor will no longer build oil pressure. I suspected many things and began my burning of money to try and fix the issue. Here is a list of things that were done that ultimately did not fix the issue. 1. Upgraded Baffled Oil pan (fixed for oil starvation on track) 2. High flow Oil pump (didn't change anything) 3. Shimmed Oil pump relief valve (no change) 4. Oil filter bypass deleted (lead slug pressed into block) 5. Oil cooler Any one have experience with this issue? Thanks, J
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While driving around the coast I noticed my car (1975 280z 2+2) has started making a repetitive spring-like squeaking sound that gets faster as you drive. But it only makes sound under acceleration, and only when driving forward. Also, it is less noticeable at higher speeds. However, it isn't that loud. So, it could be that it stops, or it could be that the engine and road noises drown it out. It sounds like it is coming from the PS rear-quarter? The car does not squeak when going over bumps or when I bounce the corners of it. I am on a trip at the moment so I can't examine it. Does this sound familiar to any of you? At this point I am thinking, brake... maybe axle related?
