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Old 04-07-2010, 06:22 PM
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increase oil pressure

I have a 350 cu in Chevy engine. Rebuilt approximately 5 yrs ago with 6500 miles on it. After driving it on the highway (the oil pressure is at 30 lbs) and at a stop sign the oil pressure drops to 5-8 lbs. Is there anyway to increase the oil pressure to run at 15-20 lbs while idling?
I was told a person can change the spring on the oil pump. Is that a solution?
Thanks

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Old 04-07-2010, 06:27 PM
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spring will effect the max preassure, not the min preassure.. a guy near me who did backyard rebuilds for demo derby guys ( junk part rebuilds basicly ). put just a tad bit of stretch in the springs to make up for the sloppy clearances..

you could also try running a heavier oil.. like a 15W40 diesel oil
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Old 04-08-2010, 05:10 AM
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At 30 psi the hiway oil pressure is also on the low side meaning the oil pressure is below any spring rate.
If you haven't done so,use a know accurate mechanical guage to check the oil pressure.Heavier oil might help a bit.
You can pull the pan and check the pump and bearing clearances.Or just drive it .
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Old 04-08-2010, 11:03 AM
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Hi,
After going through the trouble of removing the oil pump, why would you only do the spring? you know you need more pressure & probably more volume to take up the clearances,
either repair the old pump or get a new one. I think if I were faced with this condition, I'd rebuild it, the whole engine.
Rich
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Old 04-08-2010, 11:25 AM
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Quote:
Originally Posted by cares
I have a 350 cu in Chevy engine. Rebuilt approximately 5 yrs ago with 6500 miles on it. After driving it on the highway (the oil pressure is at 30 lbs) and at a stop sign the oil pressure drops to 5-8 lbs. Is there anyway to increase the oil pressure to run at 15-20 lbs while idling?
I was told a person can change the spring on the oil pump. Is that a solution?
Thanks
This isn't a really good sign. But before getting into reading the tea leaves, let me ask as to whether it's always been like this or is it something new?

An on-set of lowering oil pressure indicates:
1) internal bearing wear

2) oil pump wear

3) plugged passages or filter

4) an air leak or plugging on the pump intake side

5) thickening of the oil

6) the pickup becoming misaligned to the bottom of the pan

7) the relief spring failing

8) the relief valve hanging up so the return passage is always exposed

9) an internal oil leak from one of the passage plugs or the distributor is not properly aligned with the oil passage it intersects allowing a leak to form.

Bogie
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Old 04-08-2010, 03:49 PM
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I've been driving a 64 Chevy truck around for years that has that same oil pressure readings, and my truck is still going strong! However "IF" you have to have higher oil pressures, then I'd install a high volume oil pump! ...You see higher oil pressure while your driving, but you'll probably still see the 5 -8 Lb.s at "hot" idle ...and there's nothing wrong with those readings!
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Old 04-08-2010, 04:25 PM
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Well it sounds like you just have a basic stock oil pump and mine used to have 30 psi on the highway and around 10 at idle and it was a basic stock chevy rebuild and that was a new pump. I have since then only used high volume pumps but that is my preference but you shold be fine with it. Mine was like that for two years before I did a rebuild of it.
Eric
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Old 04-09-2010, 10:43 PM
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15-20 psi at idle is way more than needed already


5-8 at idle is normal and all that is needed

yours is high,,, either bad guage or sender unit, or stuck relief valve, or bad filter.
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