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Old 08-25-2008, 12:46 PM
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oil pressure readings

what psi readings should i expect from my 300-6?

hooking up a mechanical gauge tonight and i don't even know what to expect for numbers. what should it be at start-up? then it builds with rpms/speed, correct?
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Old 08-25-2008, 02:07 PM
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Not sure about you late model engine guys. My 56 (warmed up) at highway speeds reads around 50-55 PSI. At idle (warmed up) it is a lot less, but I have not noticed just how much less. I think around 25-30 PSI, but not positive.
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Old 08-25-2008, 02:13 PM
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Old 08-25-2008, 02:14 PM
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When it's cold it'll read higher than when it's warmed up. So don't be all worried when the psi starts dropping, lol.
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Old 08-25-2008, 02:18 PM
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Old 08-25-2008, 02:27 PM
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Quote:
Originally Posted by TheRoadVirus View Post
When it's cold it'll read higher than when it's warmed up. So don't be all worried when the psi starts dropping, lol.
gotcha - b/c as the oil warms it gets thinner, right

just making sure i understand oil pressure 101
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Old 08-25-2008, 02:31 PM
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Originally Posted by tomtoc View Post
gotcha - b/c as the oil warms it gets thinner, right
Affirmative. Oil becomes more viscous as it becomes hotter. This is what the numbers on the oil rating signify (10w30, etc)-- they're viscosity ratings at the lower and higher temperatures.
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Old 08-25-2008, 08:10 PM
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just fired it up and it looks like it was around 50-55 psi on a warm engine at lide. i revved it to 2k rpm and it got to about 60 or so. it looks like there's still some air in the line. what's the best way to get that out? let it run?
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Old 08-25-2008, 08:13 PM
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Old 08-25-2008, 08:18 PM
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Quote:
Originally Posted by tomtoc View Post
just fired it up and it looks like it was around 50-55 psi on a warm engine at lide. i revved it to 2k rpm and it got to about 60 or so.
By the way... As long as the air in the line isn't affecting things TOO much-- these readings sound pretty darned good. Cold start + revved to 2k should give a maximum of 60psi and once the engine starts to warm up and the oil will become more viscous and should drop more near the center of that 40-60 range. Sounds like you're in pretty good shape to me
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