New Engine, Low Oil Pressure? - Team Camaro Tech
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post #1 of 3 (permalink) Old Sep 17th, 05, 08:14 AM Thread Starter
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New Engine, Low Oil Pressure?

I just got my .040" over 400 back in my Camaro after sitting for almost a year. Anyway, I measured every clearance that I could and all of the bearing clearances came in at the middle to the high side of the tolerance. I did not check the cam bearing clearance, and I am still wondering why. Anyway, with straight 30 weight oil in it, I am getting about 15 psi at 800 rpm idle when hot. At 2000 rpm, I am at 45-50 psi. I am using a Melling M55A oil pump, standard volume, high pressure. This troubles me, I figured that I would have around 25 psi at idle. I know that I just need 10 psi, but I figured that a fresh rebuild would be better than 15 psi. I did install a Comp hydraulic roller camshaft this time around, would that have anything to do with the lower idle oil pressure? Seems like I remember reading somewhere that roller lifters bleed off more oil than regular lifters?

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post #2 of 3 (permalink) Old Sep 17th, 05, 08:39 AM
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Arrow Re: New Engine, Low Oil Pressure?

I have owned built and rebuilt small block's all my life and the pressure's you give sound like every small block I ever had ?? my 67 RS 327 camaro hold's about 12 to 17 idle and 35 to 45 at 2 to 3 grand , I have put 80K miles on it over the past 6 or 7 years and never had a problem ,
I did a 350 one time back when I had credit card's to get part's with and went all out with it , new crank kit from summit all fresh machine work on the block new cam bearing's hi volume oil pump the work's and it only held 20 psi at idle and after it had about 35K miles on it that dropped to 15 ??
so I personally don't think you have a problem ,

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post #3 of 3 (permalink) Old Sep 17th, 05, 08:57 AM
 
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Re: New Engine, Low Oil Pressure?

Your oil pressure is normal. As long as it does not dip below 10PSI at idle, its normal. On a cold startup, mine starts at around 50-60 PSI, but when warmed up in Texas traffic, runs at 15-18 at idle when hot, then spikes to 40-45 PSI while driving. Race engine buiders will tell you the engine should have about 10 lbs for every 1000 RPM, or 60 PSI at 6K. You can do some mods to the pump to up the pressure, but its not necessary, and might actually cost you a couple of HP because of the additional drag on the engine.
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