What is the correct Oil pressure? - Team Camaro Tech
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post #1 of 10 (permalink) Old Sep 11th, 03, 08:39 PM Thread Starter
 
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I have a '67 RS with a rebuilt 350. I don't know anything more about the engine other than it dynos at 300 HP (according to the previous owner). My Oil pressure gage reads about 40 PSI at a stand still and gets up to 65 PSI at hwy speed. Is this normal? How do I know?
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post #2 of 10 (permalink) Old Sep 11th, 03, 09:09 PM
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The general rule of thumb is 10psi per 1,000 RPM. Sounds to me like you are fine. What weight oil are you running? That makes a difference. Also the tempature of the oil will effect the pressure (hot oil lower pressure, cold oil higher pressure). From what you wrote you have "plenty" of oil pressure. Check the pressure after the car is nice and warm.

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post #3 of 10 (permalink) Old Sep 11th, 03, 09:28 PM Thread Starter
 
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Thansk for the reply. I was more concerned as to weather or not this might be too much pressure. Is this likely? I will also check the pressure with an external gage to see if my after market in dash gages are correct.
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post #4 of 10 (permalink) Old Sep 12th, 03, 06:14 AM
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If the engine is fresh and/or they installed a high pressure pump, this could be why the pressure is so high. Before you get to carried away, what weight oil are you running? Are you listing warm or cold pressures? Both of these have a huge effect on oil pressure readings.

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post #5 of 10 (permalink) Old Sep 12th, 03, 07:01 AM Thread Starter
 
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I don't know what weight the current oil is as it was in the car when I bought it two weeks ago. I was planning on changing it anyway just to be safe. As far as Engine temp at time of Oil pressure reading, I have been taking readings after warming the engine. (20-30 minutes driving time.)
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post #6 of 10 (permalink) Old Sep 12th, 03, 09:44 AM
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Before you worry about it I would suggest an oil chnage to see what you have after that. For all you know it could be 50wt in there. After an oil change and warm up you will have a baseline to work with. Make sure you change the filter too.

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post #7 of 10 (permalink) Old Sep 12th, 03, 01:52 PM
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Since this is a new car to you, when you change the filter look at the area where the filter screws on. There will be a pipe nipple hanging down that the filter screws on to. Just to one side should be a small circular area which holds the bypass valve. The bypass valve is a small spring loaded disk that lets oil bypass the filter should the filter become clogged. One trick that some guys do is to plug the bypass hole so it will not bypass the filter and allow dirty oil into the motor.

Your oil pressures are fine, but if your bypass valve has been disabled, don't get too radical with the motor until it warms up. Cold oil can raise your oil pressure to the point that the filter will rupture if you rap the motor up cold. If the bypass is in tact, I wouldn't worry about a thing.

-dnult

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #8 of 10 (permalink) Old Sep 12th, 03, 04:06 PM Thread Starter
 
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Thanks everyone for the info. I'll change out the oil this weekend and let you know what happens.
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post #9 of 10 (permalink) Old Sep 12th, 03, 05:17 PM
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10 x 1000 rpm?
So there's gotta be a minimun...if I'm idling at 1000 rpm my gauge would be at 10 psi? And if I'm on the fwy at 3500 rpm it would be 35lbs? This can't be, there has to be a starting point, and then maybe you add 10x 1000? What do you estimate that starting point to be? I've always wondered about this.

Steve W
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1966 GTO Convertible
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"You can't always get what you waaant..."

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post #10 of 10 (permalink) Old Sep 13th, 03, 11:55 AM
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10 lbs is still O.K. although I wouldn't really want to see it at 1000 rpms. Mine is 40-45 warm at 1000 rpms using 10w-40. A factory idiot light is set to come on around 7 lbs. pressure so that would probably be the dead zone.10 lbs. per 1000 rpm is just a good base line. It doesn't actually go up or down 10 at every 1000 on the money. I think anything below 20 lbs with 10w-40 at 1000 rpms is probably indicating loose tolerances on bearings. As far as the oil bypass, don't sweat it too much, it probably isn't blocked off on your motor. Mine is blocked on my 454 although most people warn against it. I would rather have the added protection on oil not bypassing my filter. I don't use my car in cold weather and I always let it warm up, no problems. I also run a high pressure pump and have had no problems. It is important to run the best quality and largest filter you can fit.

Bob
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