oil pump pressure while hot at 20ish...60ish when cold

[Powerhouse]

oil pump pressure while hot at 20ish...60ish when cold

Is that OK. Used to be high all the time after rebuild little over 1 1/2 years ago.

Running 10w40.

[Rusty O'Toole]

Factory spec is 45 PSI @ 30 MPH for an early 50s Dodge. Your pressure sounds fine to me or at least, nothing to worry about.

[greg g]

20 at idle or at speed? Low oil pressure at cruise can sometimes be traced to the cam bearings, did you change those during the rebuild??

[Rusty O'Toole]

I assume he means 20PSI at idle, 60 on the road?

[55 Fargo]

I assume he means 20PSI at idle' date=' 60 on the road?[/quote']

I would think 20 psi when hot at idle may be okay, and 60 psi cold idling or cruising would sound right.

But when we assume this, it makes an a$$ out of U and Me.

I think the poster needs to provide a little more detailed info on this.

Edited February 22, 2012 by Rockwood

[Tom Skinner]

Try running straight 30 wt Oil, and see if the pressure changes.

I usually add ZDDP to my oil also. I use NAPA 30 wt Non-Detergent.

Your pressures sound OK to me though.

On a 1948 Chrysler I used to use mixed weight oils and they didn't seem as stable as the straight weights, our Flat Heads are tough on oil..

I just don't like using different weight oil (10-40wt etc) in my Flat Head.

If it has any miles on it it seems to prefer a heavy straight weight oil.

Another thing about those 5-30wt etc Oil weights they seem more acclimated to newer closer tolerance engines than ours.

Its a matter of personal prefferences here - no right - no wrongs.

Good Luck!

Tom

Edited February 22, 2012 by Tom Skinner
spelling

[Powerhouse]

hello all,

Sorry for the vague description.

20 at idle hot. 60 at higher rpms hot...I willl check rpms next time. But it sounds like the readings are ok.

Yes, I did change the cam bearings when I rebuilt it. All though I had the guy who machined my block do that...I didn't do it personally as I have no tool to d that with and he was well versed in that.