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| | | | Joined: May 2010 Posts: 66 Wrench Fetcher | | Wrench Fetcher Joined: May 2010 Posts: 66 | Well i got my newly rebuilt 261 running(sounds great) and was just wondering if 40lbs. of pressure is good? I got everything dialed in, timing, carb, and it seems to just sing down the road. What do you think about the oil pressure? (I'm a green horn to inlines and i'm hooked now!) | | | | | Joined: Feb 2004 Posts: 29,756 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,756 | Hot or cold, idle or cruise speed? It sounds OK, as long as it doesn't drop noticeably at hot idle. The pressure will also vary a little with the type of oil you're running. Multi-weights such as 5W-30 or 10W-30 will run slightly lower pressure than straight-weight oils such as 20 or 30 weight. They stay at the physical thickness of their low-viscosity rating all the time, even though they lubricate like the higher specification when hot.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
There is a pressure-release valve in the oil pump of a 261 engine. In the 261s that I have had, the pressure on the gauge showed steady pressures no matter the temperature or oil I used. I'd expect that to be the case on a newly rebuilt engine that has a good oil pump.
The pressure-release setting produced a reading of 30 psi on one engine and 40 psi on another engine. I think that people have reported a reading of 45 psi on their engines. This variation in settings could be due to different release-valve (spring?) settings in the oil pumps or mis-calibrated oil pressure gauges.
I'd be concerned if the oil pressure reduced below the normal setting - at lower RPM or at higher temperature.
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