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Old 08-15-2006, 09:09 PM
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oil presure for 350 small block chevy

hi everyone need to no whats the stock RPM for the engine and oil presure at idol have 350 chevy sb oil presure reads at idol 5 lbs or 10 lbs thats it but when i reve motor up its goes to 60 lbs while driveing it could it be pump?or something els ok ty Rick m

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Old 08-16-2006, 12:03 AM
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You didnt mention what kind of gauge you are using but thats the first thing I would check. Jury rig up a "quality" accurate gauge under the hood where you can observe the pressure at idle and cruising rpm. Most stock sbc idle around 500-600 rpm, good luck...Dave
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Old 08-16-2006, 11:38 AM
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Sounds a little low at an idle, I've heard SBCs should be no lower than about 10 at an idle and will read about 20 psi @ 2000, 30 psi@ 3000, 40 @ 4000 etc, etc. Probably nothing wrong with what you have if it is a higher mileage motor and is not rattling or anything. Is there anything else that might give you suspicions of low oil pressure? Has the gauge just recently begun to show these readings? Any valve train clatter? If it's smooth running and not noisy, I would not worry about it.
L.D.
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Old 08-16-2006, 12:03 PM
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Replace your oil pressure sending unit....they go bad over time. Change it out and then see what your oil pressure reads.
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Old 08-16-2006, 08:17 PM
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Even better, invest in a direct reading guage and you will get the real story. I have known a lot of die hard Chevy guys that say an indication of pressure is ok at idle as long as you get 40 or better at cruise rpm. Electrical sending units are a WAG as for as I am concerned since they are a grounding unit. I never use sealant on the threads and if I did not install the unit, I will remove it, wire brush the threads and clean the threads in the block before puting the sensor back in place.

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Old 08-19-2006, 12:39 PM
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Good info.

I will also point out that SBC are notorious for dumping oil out the lifter bores. More than .0015 clearance is serious problems.

Check out Smoky Yunick's comments. He recommends MINIMUM at least 10 psi per 1000 rpm AT THE END OF THE SYSTEM, not at the pump/filter.


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Old 08-19-2006, 02:59 PM
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oil presure

Quote:
Originally Posted by eldee
Sounds a little low at an idle, I've heard SBCs should be no lower than about 10 at an idle and will read about 20 psi @ 2000, 30 psi@ 3000, 40 @ 4000 etc, etc. Probably nothing wrong with what you have if it is a higher mileage motor and is not rattling or anything. Is there anything else that might give you suspicions of low oil pressure? Has the gauge just recently begun to show these readings? Any valve train clatter? If it's smooth running and not noisy, I would not worry about it.
L.D.
ty gr8 ill go an get tack to see where it is no motor runs gr8 other than fuel trouble i think its the pump when i step on it hard it drains filter any ideals lol ok ty for the help rick m
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