924Board.org

[Beer924]

Ik zag dat de oliedrukmeter van mijn 924 2.0 opeens wel erg veel aangaf. Bij koude motor bij stationair toerental 6 bar. Als je iets gas bijgeeft loopt het op naar 8 bar. Bij warme motor stationair 4 bar. Bij verhogen van toerental ruim 6 bar. IK dacht dat het misschien de sensor was. Die heb ik vervangen. Geen verschil. IK heb een extra massadraad naar de meter getrokken maar dat geeft ook geen verschil. Weet iemand wat er aan de hand kan zijn?

[924RACR]

(Assuming the Google translate is to be trusted, you mention suddenly your oil pressure is reading above normal in all situations...)

The way the oil pressure gauge works is that the higher the resistance to ground, the lower the pressure reading. If you ground the sensor wire at the sensor, the gauge should go to max.

So if you're reading a higher than appropriate reading, this would seem to indicate less resistance than expected... yet it's strange that as such, the reading still corresponds to engine running, not just a fixed value.

I wonder if it's maybe getting too high a feed voltage, then? Is there a chance your voltage regulator has failed and is putting out too much voltage?

This is a strange problem, I've never heard of anyone experiencing that before...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[RVA]

My oil pressure is about the same, i am using quite thick oil 10w60.

[safe]

5 bar should be the maximum, 8 is very high!
If it goes higher the oil pressure relief valve in the oil pump is stuck. Its accessible from the outside, on the lower left side of the oil pump (located on the very front of the engine behind the crank pulley).

It could also be the pressure sender or gauge that's incorrect, probably what I would check first is if the gauge is actually right...
_________________
/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe

[RVA]

8 bar is indeed quite high, but for some reason it is quite normal on a 924. Loads of forum posts throughout the years about oil pressure, and some people even reporting up to 9 bars with a cold engine.

Could also be that on most cars the oil pressure gauge reading is just not correct/accurate? if its actually 9 bars you would probably blow out the seals, but thats not really a common problem on 924's

If you want to know for sure that its all good test it with a mechanical gauge, but its probably fine