Oil Pressure - Team Camaro Tech
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post #1 of 12 (permalink) Old Feb 10th, 01, 10:43 PM Thread Starter
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Joe
 
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Th oil pressure in my 396 runs about 80-85 psig when warm (starts out at ~100 cold). Idle pressure is~ 50 psig. I have a SW mechanical oil pressure gauge that seems to respond OK.
This pressure seeems high even for a modified engine.
Am I missing something?
Thanks, as always.
Joe

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69 SS396 Clone, B&M TH400, 3.55 12 Bolt Posi, Blue w/White Z28 Stripes, Chrome Rally Wheels
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post #2 of 12 (permalink) Old Feb 11th, 01, 05:36 AM
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With a hi volume hi pressure pump mine idles at 80+ until warm then between 35-40.
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post #3 of 12 (permalink) Old Feb 11th, 01, 02:40 PM
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My mildly built 396 starts out with around 80 psi, then slowly drops to about 60 when warm. Your's may be a little high, but could very easily be an optimistic guage.....

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John D. Smith
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post #4 of 12 (permalink) Old Feb 11th, 01, 04:44 PM
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<BLOCKQUOTE>quote:</font><HR>You are using a high pressure high volume oil pump like a 77hv Mellings. You really shouldn't do that in a street car. The 100psi when the car is cold can break open an oil filter and you may find alot of valve guide leakage because of excessive oil in the top of the motor. If you have the stock 4 quart oil pan there is a possibility of running the pan dry.

[/b]<HR></BLOCKQUOTE>



[This message has been edited by oger (edited 02-11-2001).]
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post #5 of 12 (permalink) Old Feb 11th, 01, 05:16 PM
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It also puts a strain on the distributor gear and pin and it uses up HP.

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'69 RS/SS396 pro street
427/4spd/9"
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post #6 of 12 (permalink) Old Feb 12th, 01, 01:03 PM Thread Starter
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Joe
 
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I do have a lot of leakage past the valve seals.
When I pull the engine (eventually), I'll probably change it.
Can you change the pump w/o pulling the engine?
Thanks
Joe

------------------
69 SS396 Clone, B&M TH400, 3.55 12 Bolt Posi, Blue w/White Z28 Stripes, Chrome Rally Wheels
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post #7 of 12 (permalink) Old Feb 12th, 01, 06:18 PM
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Yes, but it aint easy. I've done it one time.

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'69 RS/SS396 pro street
427/4spd/9"
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post #8 of 12 (permalink) Old Feb 13th, 01, 12:18 AM Thread Starter
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Joe
 
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I think I'll verify the gauge reading before I do anything.
Joe

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69 SS396 Clone, B&M TH400, 3.55 12 Bolt Posi, Blue w/White Z28 Stripes, Chrome Rally Wheels
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post #9 of 12 (permalink) Old Feb 13th, 01, 03:41 AM
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Jeff
 
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What weight oil are you running? That seems high to me....how old is the guage?
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post #10 of 12 (permalink) Old Feb 14th, 01, 12:00 AM Thread Starter
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I'm using Mobil 1 10/30. Don't know how old the gauge is but I plan on verifying it.
Joe

------------------
69 SS396 Clone, B&M TH400, 3.55 12 Bolt Posi, Blue w/White Z28 Stripes, Chrome Rally Wheels
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post #11 of 12 (permalink) Old Feb 15th, 01, 12:01 PM
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Joe, I had a situation where an in-dash gauge read zero oil pressure on a freshly rebuilt engine (high pucker factor). I wanted to verify the gauge before doing anything dramatic. Most hand held gauges were fairly costly, but NAPA had a gauge designed to mount under dash for about $20-25. I hooked it up and it worked great. Hopefully, this will save you some money if you don't have access to another gauge. BTW, the engine was great, the oil pressure sender was dead.
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post #12 of 12 (permalink) Old Feb 16th, 01, 12:41 AM Thread Starter
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Joe
 
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Cool

This is a mechanical gauge with just a fitting on the block and tubing to the gauge. I have a new industrial gauge that I'm planning to hook up to the tubing to verify the one in the car.
The one in the car seems to respond well, tho'.
Seems like a lot of pressure!
Thanks
Joe

------------------
69 SS396 Clone, B&M TH400, 3.55 12 Bolt Posi, Blue w/White Z28 Stripes, Chrome Rally Wheels
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