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Tinker · 09-04-2021, 02:32 AM

Cold oil will give you a higher pressure pump read on the gauge. All that matters is how it reads when it is hot. No one ever has an issue with cold oil or a cool radiator on startup. Sounds normal. Try a 10-30w. 20-60w is a bit much on a new engine. But on a new engine high oil pressure is a good thing thing as you hope bearings are tight and you dont need the higher velocity oil.

My 36 has a SW gauge up to 80. I bury it on startup. Some how it comes down when driving. Run hot at 25-45 at rpm, lowest has been at idle 15 (water/block temp 160-180). Normal flathead oil pressure hot are 8-10 at best sitting at idle ( I'm sure I'll get flack). Anything above 0. Flatheads are a low pressure oil system, well unless you are going to bonneville.,,

Sounds fine to me other then running a heavy oil.

09-04-2021, 02:32 AM	#3
Tinker Senior Member Join Date: May 2010 Location: MN Posts: 7,053	Re: 50 psi oil pressure gauge Cold oil will give you a higher pressure pump read on the gauge. All that matters is how it reads when it is hot. No one ever has an issue with cold oil or a cool radiator on startup. Sounds normal. Try a 10-30w. 20-60w is a bit much on a new engine. But on a new engine high oil pressure is a good thing thing as you hope bearings are tight and you dont need the higher velocity oil. My 36 has a SW gauge up to 80. I bury it on startup. Some how it comes down when driving. Run hot at 25-45 at rpm, lowest has been at idle 15 (water/block temp 160-180). Normal flathead oil pressure hot are 8-10 at best sitting at idle ( I'm sure I'll get flack). Anything above 0. Flatheads are a low pressure oil system, well unless you are going to bonneville.,, Sounds fine to me other then running a heavy oil. Last edited by Tinker; 09-04-2021 at 03:13 AM.