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High Oil pressure?

Re: High Oil pressure?

Postby LGSONE » Dec 06 2012, 11:06pm

After reading this earlier a watched mine. It runs about 65. I put a high flow pump on also so I guess it's doin it's job.

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Re: High Oil pressure?

Postby masterem88 » Dec 07 2012, 12:47am

ive drove alot of these year range 5.3's and all vary very little, most are right around 40 psi idle, 50 psi cruise speed (like 1500-2000 rpm) well obviously not the ones that the sending units are bad on that peg max. thicker viscosity oil will slightly increase oil pressure. thinner will lower slightly, and also engine run time and mileage will SLOWLY decrease oil pressure as bearing tolerances increase ever so slightly (oil pressure obviously comes from pump but also the slight resistance of flow from oil galleries and bearing clearances). same as a fresh motor oil pressure at idle (with an actual mechanical pressure gauge) and then about 1,000 miles later check it and it will be significantly lower. no worries man your good. (NOT RELATED TO 5.3's) but figured i'd let this be known. i was working on a 01 blazer 4.3, and customer complaint was oil pressure light would come on at idle after motor was warm. so put a gauge in place of sending unit to find out sending was bad. but i looked up oil pressure specifications on alldata for that engine and alldata had a spec of 6psi- 50psi at idle. i about crapped when i saw a minimum spec of only 6 psi
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Re: High Oil pressure?

Postby masterem88 » Dec 07 2012, 12:56am

i look up the 5.3 on alldata for oil pressure specs which seems same as the 4.3L and it only shows a minimum which is as follows so you all know:
6 psi at 1,000 rpms
14 psi at 2,000 rpms
28 psi at 4,000 rpms
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