Somewhere between here--------------------------------------and here.
Couldn't help myself.
There are so many variables for that.
temp
oil type and viscosity
oil pump type
oil level
rpm's
engine condition
bearing clearances
and on and on
General rule is a minimum of 10lbs per 1000rpm's at idle.
Cars normal operating temperature is 180
Oil is Vavoline race oil 20w50, car takes 6 quarts total (Kevko oil pan) car also has heavy duty external oil cooler.
Oil pump is a high flow rate Melling
Only 500 miles on rebuild 340
I do not know the bearing clearance
I believe the car at warm idle is showing 25psi on the factory gauge
Why 20w50 in a newly built (street?) motor? Why Not?
Why a HiVol pump on a newly built (street?) motor? Why Not?
With these specs you should have about 70 psi at idle. He has the high VOLUME pump, not the high PRESSURE spring...
Why 20w50 in a newly built (street?) motor?
Why a HiVol pump on a newly built (street?) motor?
With these specs you should have about 70 psi at idle, and be able to run 10w40 or thinner easily.
I'd also advise to install a good mechanical oilpressure gauge first.
If that shows the same it might be possible the oilpump's pressure check valve is hanging open.
Put a good name brand mechanical gauge on it with a "t" compare it to the factory gauge.
This will show variance in the factory gauge.
If you are real creative, you may be able to hide it under the dash and make it permanent for reference.
There's nothing wrong with running the high volume pump. I've been running them for years with the high pressure spring and have had no problems.
What is it cold at idle? What is it hot at 3500? Cold at 3500?
Krazycuda, or Trailbeast what is your thoughts on the 20w50?
Krazycuda, or Trailbeast what is your thoughts on the 20w50?
Pretty much the same as Krazycuda, but I ran 20-50 all year.
I would use 20w50 all year if it was warm here like down there... :glasses7:
But I have to deal with the Chicago winters getting below 20° F.... 8)
(Not that there's anything wrong with that...)