Thread: i got the Oil Pressure Blues
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10-20-2005 08:17 PM #1
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i got the Oil Pressure Blues
i have a newly rebuilt 350 with vortec heads and recently noticed a drop in power...Maybe...Maybe not.i only say that cause i am not sure if it is just me thinking that as i look at the oil pressure guage reading about 10 at idle and around 25 cruising and only about 30 on the hiway. Should it not be between 35 to 50?
Could it be the oil pressure guage?What are all that could cause low pressure?Got any ideas how to test the guage? Or is there any adjustments or calibrations i need to do to it?
Tia,
Lerch
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10-20-2005 08:22 PM #2
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Re: i got the Oil Pressure Blues
Excessive bearing clearance.Try a different oil pressure gauge,and sending unit.The old rule of thumb was 10 lbs. for every 1,000 r.p.m.s.Originally posted by lerch
i have a newly rebuilt 350 with vortec heads and recently noticed a drop in power...Maybe...Maybe not.i only say that cause i am not sure if it is just me thinking that as i look at the oil pressure guage reading about 10 at idle and around 25 cruising and only about 30 on the hiway. Should it not be between 35 to 50?
Could it be the oil pressure guage?What are all that could cause low pressure?Got any ideas how to test the guage? Or is there any adjustments or calibrations i need to do to it?
Tia,
Lerch
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10-20-2005 08:28 PM #3
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A stock oil pump is set at 35 psi. 10 psi at idle is ok.
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10-21-2005 07:14 AM #4
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If you are using an electrical gauge, you might want to verify the accuracy of the reading by hooking up a mechanical oil pressure gauge. Being a fresh engine, 10 lbs at idle seems a little low. Did you freshen the engine yourself, if yes what were the bearing clearances? Has the oil pressure dropped, or is this what it has always read?
Chris Laarman
Ottawa Engine and Performance
www.ottawaengine.com
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10-21-2005 02:41 PM #5
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.
Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
EG
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10-21-2005 03:27 PM #6
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solids or hydrolic? I know that most sbc's are running at about 30 to 35 lbs
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10-21-2005 04:14 PM #7
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What does running a hyd. or solid cam have to do with oil pressure?Originally posted by pizzi-man
solids or hydrolic? I know that most sbc's are running at about 30 to 35 lbsLast edited by erik erikson; 10-21-2005 at 04:26 PM.
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10-21-2005 09:53 PM #8
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Just go buy some Lucas and watch the gauge rise...lol
Stroker..!
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10-22-2005 10:20 AM #9
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hydrolics won't work with out pressure and they will make noise. Solids make noise all the time and will continue to workwith out oil pressure. If your lifters are hydrolic and quite you should be alright
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10-22-2005 07:05 PM #10
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UMMM,I think he would hear a rod or a main bearing knocking without oil pressure before he would hear a hyd. lifter.Originally posted by pizzi-man
hydrolics won't work with out pressure and they will make noise. Solids make noise all the time and will continue to workwith out oil pressure. If your lifters are hydrolic and quite you should be alright
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10-23-2005 04:30 AM #11
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I agree with that!Originally posted by erik erikson
UMMM,I think he would hear a rod or a main bearing knocking without oil pressure before he would hear a hyd. lifter.
come to think of it, I have never had a non-roller valve train that was totaly quiet. All of the GM small blocks I have ever owned produced a little noise.
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10-23-2005 06:37 AM #12
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Hi Guys,sorry i have been out and not able to read or respond to your suggestions.But let me see here.
1. i have a mechanical gauge. (there is no sending unit to a mechanical,correct?)
2. its a somewhat new rebuild.maybe 4000 miles is all.So no,i don't think its time ALREADY for a rebuild.And No, Lucas is for worn engines.this is Not a worn engine.
3.its got hydraulic lifters. (Very quiet.no noise at all.in fact i have never heard such a smooth running quite engine.)
4. it seems like it was reading a little higher before i put in this new distributor.why would that make a difference?
Thanks for the responses.
----Lerch
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10-23-2005 09:46 AM #13
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no oil pressure and every thing makes noise low oil pressure will still lubricate the lower end but will not properly fill the hydrolic lifters and there for make noise. when the lifters make noise it's time to check the oil and add( tell the little lady that, they wait for the light and still don't understand). when the rods make noise it's time to reach way down in to that pocket and pay big bucks
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10-23-2005 09:52 AM #14
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the dist gose thru the oil gally and plugs it . msd give you Orings to dry this up. but block needs a lead so you do not cut the O ring when you put this in the block but. i do not think this is it . dos the oil look good ?how hot is it ?try changing the oil and filter try a new oil gauges 10 psi at 1000 is good 35 at 3500 is just fine and will run that way for a very long time you do not need 65 psi but when you get on it the oil psi needs to go up
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10-23-2005 11:19 AM #15
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Is it with oil pressure or with low oil pressure?Your story changed.Originally posted by pizzi-man
hydrolics won't work with out pressure and they will make noise. Solids make noise all the time and will continue to workwith out oil pressure. If your lifters are hydrolic and quite you should be alright
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