Oil Pressure

[tscaptain]

Yep, they sure do! That's because they have an electric oil pump (supplies pressure as requested by some computer somewhere!) instead of a mechanical one which is simply rev driven. Try driving along at a steady speed and then plant your right foot. The oil pressure increases almost instantly and way ahead of the rev increase. What you see is perfectly normal.

 

[JAH]

ORIGINAL: tscaptain

Yep, they sure do!  That's because they have an electric oil pump (supplies pressure as requested by some computer somewhere!) instead of a mechanical one which is simply rev driven.  Try driving along at a steady speed and then plant your right foot.  The oil pressure increases almost instantly and way ahead of the rev increase.  What you see is perfectly normal.

Thanks for this - I'll stop panicking !!

Jonathan

 

[c2s]

I needed to ask something about the clock display but my 997s is at Porsche bodyshop having a upgrade so cant take a photo.
anyone has a photo os a set of gen1 997s clocks to post up so I can make double sure I get the right info before posting a "maybe" problem

 

[tscaptain]

Here's a turbo dash - exactly the same though as I recall (apart from word "turbo" in the middle and the red line!)

 

[c2s]

Thanks, thats great.
The clock at the far left, that goes to 90-105 and I am not 100% but when it hits 100 the loud fan comes on behind my right raidator, loud..
All this time I though that was temp I have no idea why, really stupid of me, my oil (far right) hits 5 on high revs but normally sits at a nice 3 while driving.
The thing that has been bothered is the left clock what should that be sitting at, it has never went any higher than 105.

thanks for photo.

 

[tscaptain]

Left clock, oil temperature, will vary according to how hard you are driving but the normal range is around 80-110. Never seen it higher than that even on track. BTW, what revs do you need to get the oil pressure to "5" when it's warmed up?

 

[c2s]

when its warmed up and its sitting it at 5 its normally when I am flooring it, but it drops all the time depending on what gear I am in normally 3 revs is around 3.5.
as for the left clock it would never be 80 for me after into a 5 mins drive, its always 90 -105, never went above that.
it just seems funny how thats when the fan comes on or maybe I ws looking for that

 

[STiG911]

Okay, this may be academic, but I had a similar thing with my 2005 C2s last month. I found that the drivers side fan would come on full-force most of the time, with no apparent action from the nearside (no hot air blowing out either)
After checking 'the forums', I found that the passenger side fan can get stuck sometimes as, being near the nearside (duh) of the road, all sorts of detritus can get in through the vents in the arch liner jamming the fan blades.

I spoke to Paragon (car only new to me 4 months) as I was hesitant about doing this myself despite years of fixing all my other cars myself (Generally don't trust garages) but after a chat, decided to tackle the issue.
so, remove the front nearside wheel, use a torx bit to undo 6 screws from the lower arch liner and trailing underside of the front bumper. Remove the arch liner and Holy Pants - all sorts of silt and stones jammed between the fan and the cowling.
Once removed and reassembled. Short drive to warm the lady up, sit for a bit and Hey Presto! No more Jet Fighter fan noise. Both fans working in unison, like they should do.
Happy days.

 

[garyw]

Excellent report on that Stig, glad it was resolved so simply...

garyw

 

[c2s]

hey stigy, awesome post.
I will give this a go on Friday, atm the fan is turbo charged and 100% sound like a jet fighter taking off.
I will keep you posted, thanks for replying.

 

[c2s]

okay, took wheel off, followed directions and bang loads of stones, put it all back and both fans now come on fine, no more turbo mode.
GREAT, tonight I am very very happy!
Thankyou for SOUND instructions.

 

[STiG911]

Just checked back in on this topic - glad my tip worked out! Lesson for all I hope.
Happy motoring folks.

 

[Lancerlot]

Rob,

All that sounds quite normal and shouldn't give undue cause for concern, but take a look at this thread for more info. http://www.porscheclubgbforum.com/tm.asp?m=800271 Blue smoke on start-up seems to vary between individual vehicles but if excessive and you're using a lot of oil, it may indicate engine wear or defect.

Official oil changes are every 2 years, but many of us feel this is overly long for a high performance sports car and therefore change oil and filter each year. 0W-40 or 5W-40 are the recommended viscosities, which with a new filter should give the correct pressure.

Regards,

Clive.

 

[waxman]

Hi rob
As Clive says , sounds normal
For reference my C2S gen 1 was low mileage ( under 24k when i bought at 6 yrs old) and always seemed to run at nearly 5 bar- I took it to my OPC twice as I was concerned as you are and always was told by the technician that high pressure such as this is fine
I do notice my Gen 2 GTS usually runs much lower but it is a different engine type and DFI
Sounds ok

 

[snarf]

As per comments above probably normal, however, when the oil temp is above 90 deg C you should be able to see the oil pressure increase as the engine revs increase from idle to 3000rpm when it will level of at the 3 to 4 reading. I had an intermittently faulty oil pressure sensor that caused a reading of 4 to be seen regardless of how low the engine speed dropped. Convincing the OPC that I had a problem was tricky as they initially claimed that without seeing the problem for themselves they couldn't submit a warranty claim. Their suggestion that I leave the car with them until the fault manifested itself on a test drive didn't appeal to me so with a little persistence they eventually accepted a photograph of the instrument display as evidence.

 

[STiG911]

The 997.2 engine design removed the IMS shaft and (I think) most or all of the camshaft chains, reducing moving parts and internal friction.
Insofar as oil pressure is concerned it will be affected by both standing temperature and age.
Newer oil = higher pressure at standstill. Usually 3.5 bar.
Once the oil is warmed through and a bit older, say 3 to 4 months or so, idle pressure will be about 2.5 bar which is fine. The pressure should rise to 4.5 to 5 under acceleration and stay above 4 even at low speeds. Actually, thinking about it, the 2nd gen engines had an electric oil pump for greater efficiency and spins faster or slower according to demand, so this would account for readings unfamiliar to a 997.1 owner such as yourself.

 

[C2dweller]

This is a common question we get asked from customers who have changed to a 9X7.2 MA1 - it would appear that oil pressure 'displayed' is generally lower, compared to M96/97 engines.

 

[guitarplayer63]

Hi,
Mine sits at around 2bar when idling, but when under load rises. I was on the Autobahn last week several times and it then sits around 4 bar relatively constantly at higher speeds.
HTH

 

[skendrick]

Thanks guys, that's put my mind at rest. []

 

[tscaptain]

As mentioned earlier it"s the "on demand" electric oil pump at work. Try it, put your foot down at relatively low revs and see how the oil pressure jumps up immediately.