High Oil Pressure - TCCoA Forums
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post #1 of 5 (permalink) Old 03-06-2016, 10:34 AM Thread Starter
V22
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High Oil Pressure

Hello everyone,
I've noticed ever since I did my last oil change, my oil pressure has been higher then usual. I've heard that it's just a dummy gauge, but it's never gone past the middle. Now the arrow is on the "m" in norm, once I get up to highway speeds (60-65), when before it was on the "o" or "r".

I didn't overfill it, and there's no burning or loss of oil. Oil filter is OEM and secure. The oil reads on the word full. I guess it should be below it, to the edge of the crosshatch?

Just curious as to what's normal and what's a cause for concern.

Thanks!

1996 Mercury Cougar XR7 4.6L , Vermillion
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post #2 of 5 (permalink) Old 03-06-2016, 11:34 AM
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It is a dummy gauge, the sender is literally an on off switch. Any fluctuation on the gauge end can be chalked up to voltage and connections.

-Matt
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post #3 of 5 (permalink) Old 03-06-2016, 06:40 PM
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Here is link to a oil pressure gauge mod to make the factory gauge fluctuate like a real oil pressure gauge.

http://forums.tccoa.com/37-work-prog...auge-pics.html


I have often thought about making this modification. Instead I would/will run a real-time aftermarket oil pressure gauge, and locate it on an "A" pillar pod cluster along with a fuel pressure, and coolant temp' gauges. A manifold vacuum gauge would be nice too.

Interesting to note too is that many modern vehicles have a fuel pump shut off switch incorporated with the engine oil pressure sending unit that will shut the fuel pump off in the event of low oil pressure.

Also, slight differences in the amount of oil in the crankcase will not cause changes in oil pressure. Unless the oil is stupidly low, or way overfilled causing the crank to hit the overfilled amount in the sump, causing air bubbles to form (froth), and hence causing oil starvation or cavitation.

Oil pressure is created when the oil pump flows a volume of oil into the confined spaces within the engine. These confined space(s) are (for the most part) the oil galleys, and the space between the main bearing, and connecting rod bearing fillets.

All things being equal, oil pressure fluctuations are caused by the temperature of the oil changing its viscosity.

See Pascal's Law for in depth knowledge.

https://en.wikipedia.org/wiki/Pascal%27s_law

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post #4 of 5 (permalink) Old 03-06-2016, 07:14 PM
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Not to delve off topic but the fuel kill switch is odd thought. I'm not aware of that "advance" and my initial reaction was: hmm, that would be simple to wire up. Then I immediately thought about the ferver the GM ignition switch fault generated, which this scenario would be identical to - Oil pressure plummets(which many of us have experienced as a stupid connection fault), engine shuts off, no more power steering(though probably a non issue with electric) no more vacuum, so you're running on the reserve where a few pedal depressions can deplete. Just seems like lawsuit bait, even if an engine is prone to oil consumption and this is used as a fail safe to prevent full lockup and some potentially costly warranty work, any lawyer and certainly the media would see exactly that as the motivation for what is essentially an unnecessary device - putting monetary cost over life. Where's Ralph Nader?
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-Matt
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post #5 of 5 (permalink) Old 03-06-2016, 11:11 PM
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That's a good point Matt about safety concerns.

And, ah, poor use of the word "modern" on my part. General Motors has been using such cut off switches for decades. Must have something to do with cost analysis of human life.

I'm also considering a vehicle in use with no, or critically low oil pressure, is going to stop running even without a cut off switch...

Perhaps the cut off switch would actually save lives since it keeps a potentially dangerous vehicle from being driven...

Whatever the case may be I know I ran one on my race cars.

1995 Thunderbird LX 4.6l 97 Headlamps/Hood All Red Tails Muffler/Resonator Delete
2004 Tahoe 5.3 4x4
2008 Acadia Limited AWD

...still looking for a clean, low mileage, rust free 96/97 Thunderbird 4.6

Last edited by rushtonracing; 03-06-2016 at 11:13 PM. Reason: Typo
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