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Old 12-16-2002, 00:10   #1 (permalink)
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Oil Pressure

Just needing an idea of how to read the Oil Pressure gauge?

My Ea Spac Cluster has one that reads "Left is 0 and Right is 7"

Where should it sit?

What does it mean?

When my engine is fully warmed up and being for a cruise around 80km for a while and i slow down the oil pressure drops towards the left hand side upon picking up revs it goes back towards the middle?? Is this normal.

Thanks
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Old 12-16-2002, 02:55   #2 (permalink)
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the greater the revs means the oil pump will be pumping more oil thus more oil pressure.
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Old 12-16-2002, 14:52   #3 (permalink)
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What you've described sounds normal. Depending on the age of the car, the condition of the oil pump and the type of oil you use it will vary a lot. My short term cure for low oil pressure was to switch from 15w-40 to Pentrite HPR30 which is 20w-60. This helped pressure right across the rev range by bringing the pressure up two bars on the gauge. As it happens now at cruise, it sits at 2 and a half bars (you can guess what it was before...).

Another way to increase oil pressure is to fit a AU pressure spring. This will typically bring the oil pressure to 2/3 on the guage over the entire operating range.
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Old 12-16-2002, 16:03   #4 (permalink)
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this pressure spring is on the oil pump, right?
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Old 12-16-2002, 16:32   #5 (permalink)
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This is all helping heaps as i know little about the oil sytem pressure etc so thanks so far.

In what case would the gauge read all the way over to the right hand side?

And after i have being crusing and a hot day with air con on once i come back down to an idle rev 650rpm i noticed the oil pressure gauge was just touching a bit of the red on the left hand side between 0 - 1, but the minute i touch the gas pedal slighty it picks up like i said, then drops off when i take foot off gas.

What should i do should i be worried? Its new oil.

Can the gauge give you an indication if oil is low?
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Old 12-17-2002, 09:36   #6 (permalink)
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What sort of oil are you using? On a hot day with air-con on the oil will thin when it gets really hot, thin oil = low oil pressure. Depending on the state of your engine, you should run a multi-grade 20w-something, certainly not 10w (in summer at least).

I too use Penrite 20w-60 and have seen a good improvement in oil pressure. Just remember - thin oil for winter, thick oil for summer.

Quote:
In what case would the gauge read all the way over to the right hand side?
Usually when motor cold at start-up.

Quote:
Can the gauge give you an indication if oil is low?
Never rely on a gauge for this, oil levels should be checked visually. Gauges are indicators and are rarely accurate. If the oil pressure drops suddenly usually a warning light will come on, the gauge will show no pressure. Stop the car immediately, if not sooner.
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Old 12-17-2002, 12:41   #7 (permalink)
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Not too sure how high these things should go. Cogo is right though, the greater the revs, the higher the oil pressure. There should be a relief valve, which is designed to divert some oil back to the sump at high revs - this might be after the sender unit though (not too sure), and so I imagine that the pressure could go right uop momentarily before the valve has let off the excess. Normally failure of this valve will lead to a lack of oil pressure.

Then, I'm not a mechanic either ;o)

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Old 12-28-2002, 14:02   #8 (permalink)
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no there is no release valve and if your oil presure guage manages to get all the way to 7 you must have something like 10 litres of oil in your sump. The normal pressure you should see on that guage is around 3 marks at maximum when putting pressure on the motor. and when the air con is on it can go down to sit right next to the red mark. If it falls to the red mark when your driving (above 1000rpm) turn off the car that second and pop it out of gear. Stop the car and don't drive it till you fix it.
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