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What's Normal?
Ok folks, what's the "normal" range of oil pressure for a 302 with a standard volume/pressure oil pump? How about on an engine with less than 100 miles on it?
Thanks, Greg |
If you're running bearing clearance up to .0025, you should be fine with about 10psi per 1k rpm.
What are you seeing? |
Greg,
Oil temp at 180-190 degrees, 2500 RPM, around 65 PSI. Idle can vary a lot but somewhere in to 25-30 range. Normal rod and crank clearances are at 0.0025" With cold oil you may see 80+ pressures on startup. If you can't get your oil temp up - you might consider a bypass/thermostat for the oil cooler. Jim |
Thanks Jim and Joe. I am seeing 80+ at startup, and then 90-95+ at 3000rpm after running for 5-10 minutes. For now I am running w30 Pennzoil. I don't have the oil cooler plumbed yet, but guess I need to give the oil more time to warm up. Any thoughts?
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I'm running 60-65 psi at full temp. 80 psi when cold. Even at idle I'm still doing 40-50 psi. 20-50 oil. This was/is a brand new right from the manufacturer 302 engine with about 20K miles on it. Not a rebuilt or crate motor.
Ernie |
5W-30 Oil;
65lbs cold at idle (1000rpm) about 75lbs off idle. 45lbs warm at idle (900rpm) about 60lbs off idle. - Dan |
Greg,
You might want to consider using 10W30 or 10W40 instead of 30W. A thicker oil will give you more pressure but less flow, more flow will run the bearings cooler. BTW, I have an oil cooler installed, but not hooked up. Joe Lapine (who built my 302) said it just wasn't needed except for track use. So far he has been right - without a cooler my oil has never gone over 190 degrees. Jim |
Ernie, Dan, Jim,
Thanks. Since I wanted to change oil soon anyway I think I'll give 10w-30 a try. Jim, when I hook up the oil cooler I will use a thermostat. You are right about only needing it for track time, and I know oil that is too cold is not good. Thanks, Greg |
Jim has it exactly right, pressure does not equal flow! I would consider a 5W-30 synthetic. Avoid the Fram filter.
Bob |
Bob,
Yup, no Fram's on any of my cars. I stick with Motorcraft on my Ford's. I will definately switch to a lighter multi-viscosity oil this weekend. I won't switch to synthetic yet as the engine still has less than 50 miles on it. After I have a few thousand miles on the engine I definately will switch to synthetic. Thanks, Greg |
High Volume Pump was the problem
Well I tried switching to a lower visocity oil (5W-30) and that did not help. So I decided to tear of the oil pan and check the oil pump.
After comparing the installed pump with a brand new standard volume pump it turns out I had a high volume pump, not a standard volume as I assumed. The depth of the pump rotors were deeper than the standard volume pump (more surface area, hence more volume.) Anyway... installed a standard volume pump and now my oil pressure is 60-65lbs off idle with cold oil at start-up. By the time the engine warms up and idles steady the pressure is 45lbs. After warm and revving to 5000rpm the pressure goes to 65lbs max. Sounds good to me. Greg |
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