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Old 03-15-2004, 09:42 AM   #1
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Low oil pressure question

Just wanted to find out if this is normal? I have speed-pro high pressure pump md #224-43370. My mains are min-.0023 max.0029. My rod bearings are min .002 max .0023. I'm running 50wt oil. When my motor is cold my pressures are 50lbs at idle and 70-72 at 3500rpm. After I warm up my pressure drops to idle 22-24psi 950rpm and at 4000rpm it is at 52psi. Do I need to take a look at the mains. I'm running a T70 precision turbo with a -an4 line tapped where the pressure sensor is. I have not tried a mechanical gauge yet but since it reads much higher when its cold I figure the gauge isn't the problem. It’s a brand new auto meter.
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Old 03-15-2004, 05:32 PM   #2
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ttt
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Old 03-16-2004, 12:19 AM   #3
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My clearances are a little tighter than yours on the rods, and I see 65psi cold @ 800rpm idle. When warmed up, I see 50psi @ idle, and 75 @ 3000rpm.

I'm using 20w50 at the moment. I'm using a Melling HV pump.
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Old 03-16-2004, 01:03 AM   #4
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Those numbers don't seem too bad to me. 22 pounds is fine. You ARE using very thick oil though, but this would not cause those low pressure "problems". If this pressure has been constant throughout the life of the engine and hasn't declined much since you put it together, it should be fine. I would maybe cut open the filter on your next oil change to inspect and put your mind at ease.
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Old 03-16-2004, 09:19 AM   #5
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I have saved all the filters and marked them from the first one I used till now. I'm on my 4 oil change since the motor was fired up on 2/15/04. The pressure hasn't changed any if any it went up a little as I increased the weight of the oil. Not much althought. I went from 10-30 to 20-50 to 50wt it only went up a few pounds. One thing I did notice the motor hits the rev limiter at 7500 quicker with the 50wt oil. Maybe it had nothing to do with it. I'm not sure.
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