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| Using less oil... https://www.slantsix.org/forum/viewtopic.php?t=9991 |
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| Author: | MitchB [ Sun Aug 01, 2004 9:59 am ] |
| Post subject: | Using less oil... |
Since replacing the main & rod bearings in my 150K+ 80 Aspen, the engine is now using less oil. I pulled the OEM bearings with 0.0035 to 0.0040 measured rod clearance. New bearings gave me just under 0.0020. I was using roughly 500 miles/quart of Mobil I 10/30. I haven't nailed it down yet, but this has at least doubled. Oh, yes, I do have 3 slight leaks: the oil pressure gauge, rear main seal ( I didn't R&R) and my oil cooler adapter. So what my real oil consumption is, I do not know. But it has markedly improved. New, the car used maybe 1/2 quart in 3000 miles. Observation: less oil being thrown on the cylinder walls = less oil consumption. Mitch |
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| Author: | Dart270 [ Sun Aug 01, 2004 6:30 pm ] |
| Post subject: | |
My guess is the rear main seal is leaking less. I saw a big change in rear main leakage when I went back down to 60 psi max oil pressure from 85 psi (hi press spring). 0.002" is fairly high for a Slant, and 0.004 is way too much. Good result in any case - congrats! Lou |
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| Author: | MitchB [ Sun Aug 01, 2004 6:55 pm ] |
| Post subject: | |
Quote: My guess is the rear main seal is leaking less. I saw a big change in rear main leakage when I went back down to 60 psi max oil pressure from 85 psi (hi press spring).
I didn't change the rear main bearing or seal and the oil pressure remains unchanged @ 50 psi (TRW high volume pump). So, it most is due to less oil being thrown around inside the engine.0.002" is fairly high for a Slant, and 0.004 is way too much. Good result in any case - congrats! Mitch |
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