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#1 |
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Join Date: Feb 2009
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433 12:1 BBC bracket engine that has 43 lbs of oil pressure crossing the 1/8 mile stripe at 6500 rpm. The engine has 150 runs on it and I always get an oil analysis from Blackstone that never shows any abnormal wear. I used to run HV pumps with lots of pressure cause I'm from the 10 psi/1000 rpm era so this worries me some. I run Brad Penn 10-30. The car is 3000 lbs with me and goes 6 teens in good air 1/8 and low 9.70's 1/4. Clearances are .0021-.0023 rods and I think .0025ish mains.
Am I living on the ragged edge? Should I run 40 weight? I have some straight 50 Valvoline racing on the shelf that I could add. I run 6 total. Thanks for any and all thoughts. |
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#2 |
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Personally I think you are fine with the oil pressure that you have. As long as the bearings have oil the engine will be happy. Your oil testing is showing that. depending on what your combo is 150 runs is usually on the outside of needing a freshen up.
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Mike Pearson 2485 SS |
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#3 |
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Join Date: Feb 2002
Location: Southeast Michigan
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Here are the typical questions , was that the pressure when the engine was new ? Are you sure the pressure gauge is reading correctly Other questions are what type of lifters do you run ? Are the lifter galleries restricted ? I am with you , would rather see 60 psi at speed.
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#4 | |
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I'm not sure the gauge is correct because I have a small copper line going to it. It's a SW mechanical gauge that is very old. The lifter galleys aren't restricted but my pushrods are restricted to .028. Lifters are Crower Hippo severe duty. I learned that 10 lbs per 1k rpm was old school and over kill. I know that volume and pressure are different too. That's why I went with a standard volume pump but 40 at 6300 has me a little nervous. It might not be much higher at 7k when I run 1/4 mile. I need to start logging it or at the very least put a larger ID line to it. |
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#5 |
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maybe take the oil pressure reading off the FRONT of the block instead of the back of the block as the front is the LAST place that sees oil in the system if it is not looking bad inside I would not be overly concerned-- maybe next pass look at the oil gauge and see what it reads say at half track and thru the lights too will give you an idea of what your pressure is at various spots on the track--- FED 387
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#6 |
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Ron… X2 on taking oil pressure from the front of the engine. Oil pressure reading will be after all internal leakage. MB
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#7 | |
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