Oil Pressure surprise
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    Official RnS Addict Zody's Avatar
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    Oil Pressure surprise

    Been running my big block for a couple of months now, the oil pressure was what i thought good, starting up form cold the gauge would read 65lbs & when normal temp on tick over was 28-30lbs...decided to change the oil & filter the other day, in which I change the old oil filter from a short type to a long type, very surprised to see the oil pressure on start up is now 85lbs & on tick over at normal temp (180deg) reads 55lbs..

    Still baffled to why this has happened...wrong oil filter or faulty in the first place .....any Idears
    The car is open, the keys are under the dog !

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    Off the Xmas card list kapri's Avatar
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    Couple of possibilities, some filters have built in blow off valves and a higher resistance element will reduce pressure. That could mean your filter is better ,or worse, than the previous one, ie one may be restrictive (or correct) and the other offering less resistance or poorer filtration? What makes are we talking about?

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    Exceeded sell by date Plumpcars's Avatar
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    Are you using Fram?

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    Official RnS Addict Zody's Avatar
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    The old filter was a Fram Ph16 ( short one) & now changed to a power train which is cross referenced for a
    Fram Ph8A (long one)
    The car is open, the keys are under the dog !

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    Exceeded sell by date Plumpcars's Avatar
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    There's plenty of talk on the net about problems with Fram filters in the last few years, one of them being low oil pressure. I went over to K&N and gained pressure on the Hemi.

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    Rods 'n' Sods Junkie
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    fram--the orange box of death

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    Official RnS Addict mygasser's Avatar
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    Quote Originally Posted by Zody View Post
    The old filter was a Fram Ph16 ( short one) & now changed to a power train which is cross referenced for a
    Fram Ph8A (long one)
    is it a ford big block? i ask as a ph8a is a ford filter number.
    need a job done on your project? i may be able to help.

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    Exceeded sell by date Plumpcars's Avatar
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    Some aftermarket Chevy filter mounts use the Ford mounting thread.

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    Official RnS Addict Zody's Avatar
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    Your so right Steve, the engine came with a aftermarket summit oil filter performace
    adapter...3/4" thread type in stead of the stock item... as the filter treads chevy's
    motors were 13/16"

    I'm well pleased with extra oil pressure it's showing, I'm a great beliver of plus oil
    pressure's other than low reading on the gauge..my old 383ci used to start up at 90lbs
    & drop to 60lbs when hot
    Last edited by Zody; 22-05-2011 at 22:40.
    The car is open, the keys are under the dog !

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    Maybe the oil is a different grade, as the oil pressure guage should be measuring pressure at the main bearing gallery, and the pressure should be controlled primarily by the spring rate and pre loading of the pressure releif valve, a change in viscosity will invariably change the pressure reading on the guage as the new thicker oil has a hard time getting around the engine. keeping in mind also, that oil is diluted as petrol gets past the rings and into the sump, oil diluted by petrol doesn't have as much viscosity as new oil.
    best regards
    Rick

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