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05-12-2021, 09:07 AM | #1 |
Senior Member
Join Date: Apr 2018
Location: Chelmsford, ON Canada
Posts: 529
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High Oil Pressure
I have read several threads on oil pressures in flatheads, and need to confirm if I am making the right decision, as to the grade of oil I am using. I have a stock 59AB in my '46 Coupe, running Shell Rotella 15-40. When at running temp, the oil pressure is 20 psi at idle, and 60 psi at cruise. A few comments on previous posts, say that high oil pressure can damage the bearings. Is this something I should be worried about? I am thinking of changing out to 10-30 grade, to see what affect the lower viscosity will have on the pressures. Thoughts and comments are appreciated, even if this old horse has been beat many times.
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05-12-2021, 09:23 AM | #2 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,316
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Re: High Oil Pressure
I believe that 55 psi is the proper high pressure. That's what I have on both of my engines. The fact that you have 60 is probably not a problem. It may be caused by running the heavier diesel oil. In my opinion, a switch to a lighter weight oil intended for automotive use would be a good move for several reasons. As long as adequate pressure is maintained, the lighter the oil you can run the better.
Remember the old rule of thumb "10 psi per 1000 RPM". |
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05-12-2021, 09:39 AM | #3 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,526
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Re: High Oil Pressure
While not too high, I would switch to 10W - 30. Been running that for many years.
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05-12-2021, 02:56 PM | #4 |
Senior Member
Join Date: Dec 2010
Location: East Coast in CT
Posts: 1,529
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Re: High Oil Pressure
Your oil pressure reading is fine don't lose any sleep worrying about it.
Ronnieroadster
__________________
I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
05-12-2021, 03:28 PM | #5 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,408
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Re: High Oil Pressure
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