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isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

I changed the oil a couple of days ago. I have noticed at idle, the pressure is at about 2 bars, then driving at highway speeds with higher RPMs, like 4-5k, the pressure is up to about 7-9 bars. Is this normal? The haynes says at 2k RPMs, pressure should be 3-5 (from memory as I don't have it right here).
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Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Smoothie · Posted: Thu Aug 30, 2007 2:02 am Post subject:

Don't know off the top o' my head what the upper limit should be, but roughly 2 bar per 1k rpm is about right from my own past experience. It's normal and good for the pressure to rise with engine speed.

Tech Specs says approx. 7 bar at 5000 rpm and oil temp 80-100C.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

924RACR · Posted: Thu Aug 30, 2007 2:17 am Post subject:

Yes, though usually (with miles as well as temp) once warm the high pressure will fall to around 5-6bar or so... might want to clean out your oil pressure relief valve just to be sure...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

924RACR · Posted: Thu Aug 30, 2007 5:27 am Post subject:

Yes, it's pretty easy, and no, it won't cause the loss of a lot of oil... unless you do it with the engine running!

_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

The oil pressure relief valve is the "housing relief valve" PET part 046115419? It is just below the bottom of the timing belt? Just loosen the bolt and pull it out?
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Paul · Posted: Thu Aug 30, 2007 9:30 am Post subject:

yep, just don't let the ball bounce.
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White 87 924S "Ghost"
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Owned and repaired 924s since 1977
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isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

I cleaned it, but didn't let any balls bounce. Seemed fine. I guess Smoothie's 2bar/1k RPM is about what the car does.
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew