964 oil pressure?
05-29-2003, 01:58 AM
#1
Instructor
Thread Starter
964 oil pressure?
What should the proper oil pressure be at various points for a '89 C4? I'm between 2 and 3 bar at idle, and then pretty much anything over 2000rpms and I"m pegged at or above 5 bar. Is this normal? Thanks.
05-29-2003, 03:10 AM
#2
Hi,
Oil pressure at idle varies a lot between cars. Some people see the same as you - some (like me) are only just over 1 when the engine is warm. Everyone seems to get 4.5-5 by about 3K rpm.
The only figure Porsche quote in the handbook is that it should be above 3.5 when the engine is at 5K rpm.
I'd say your oil pressure looks fine.
Oil pressure at idle varies a lot between cars. Some people see the same as you - some (like me) are only just over 1 when the engine is warm. Everyone seems to get 4.5-5 by about 3K rpm.
The only figure Porsche quote in the handbook is that it should be above 3.5 when the engine is at 5K rpm.
I'd say your oil pressure looks fine.
05-29-2003, 03:37 AM
#3
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Just in case be very careful when adding oil, the engine must be running it´s not like in normal cars and overfilling is absolutely no good.
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ALEX
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ALEX
05-29-2003, 04:59 AM
#4
Rennlist Member
Alex,
That's a very usefull addition to this thread - I gues it doesn't matter how often it is said.
One thing though; what are the consequences of overfilling?
That's a very usefull addition to this thread - I gues it doesn't matter how often it is said.
One thing though; what are the consequences of overfilling?
05-29-2003, 05:39 AM
#5
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I know one possible answer to this...
I had an immobiliser problem on my C4 a few years back. The RAC man who came to fix it told me about the first time he dealt with one. He didn't know that to read the dipstick the engine must be running at temperature so he kept adding litre after litre of fresh oil. A few miles down the road the engine blew up.
At least the owner got a brand new engine courtesy of the RAC...
I had an immobiliser problem on my C4 a few years back. The RAC man who came to fix it told me about the first time he dealt with one. He didn't know that to read the dipstick the engine must be running at temperature so he kept adding litre after litre of fresh oil. A few miles down the road the engine blew up.
At least the owner got a brand new engine courtesy of the RAC...
05-29-2003, 07:01 AM
#6
Drifting
Georgie,
Oil pressure is "the important"issue for a engine.
Mine is between 1.3 and 5.
In hot condition [oil temp gauge on 10 o'clock] and in idle 1.3. Lower does it not go.
Under the same conditions and at 3000 rpm is 5 Bar.
In "warm up'condidtion [gauge on 7 o'clock] it is in idle 2.5/3.0 and 5.o at 3000 rpm.
Oil use Mobil 1 0W40.
Greetings,
Arjan B.
964 C2C 1992 Black
Oil pressure is "the important"issue for a engine.
Mine is between 1.3 and 5.
In hot condition [oil temp gauge on 10 o'clock] and in idle 1.3. Lower does it not go.
Under the same conditions and at 3000 rpm is 5 Bar.
In "warm up'condidtion [gauge on 7 o'clock] it is in idle 2.5/3.0 and 5.o at 3000 rpm.
Oil use Mobil 1 0W40.
Greetings,
Arjan B.
964 C2C 1992 Black
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05-29-2003, 08:33 AM
#8
Just to add, once you have measured the oil level in the car it is of course not absolutely necessary to keep the engine running whilst actually filling up with oil. If you know you need only a little bit of oil in there, then you can of course switch off the engine and just pour in the small amount you need. The reason I mention this is that I have heard of people who have got clothing caught in the running engine fan - can't be much fun! I don't make a habit of either method, but sometimes when I need 200ml of oil and I am filling and my hand is about 6 inches away from the fan turning at approx 880rpm, I think perhaps the engine should have been switched off.....
05-29-2003, 08:58 AM
#9
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For years I did my own oil changes and still do but, this spring I had my wrench do the change while it was in for service. I was impressed and awed by the fact that he was able to fill it so that the gauge was exactly mid way way up, just the way its supposed to be. I alway managed to get the thing pegged, not overfilled but right to the top. Gawd I love that shop.
05-29-2003, 04:27 PM
#10
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</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">I'm between 2 and 3 bar at idle, and then pretty much anything over 2000rpms and I"m pegged at or above 5 bar. Is this normal?</font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">I sure hope so, since my '90 C2 behaves in the exact same way. And just to state what has been stated before, reading the dip stick in a 911 is NOT an easy exercise.
If the oil is clean, I defy you to tell exactly where it is between the low and high marks. I am thiking of developing some goo to put in the crankcase just to dirty the oil so the bleeding dip stick can be read!
....or not.
BGL
If the oil is clean, I defy you to tell exactly where it is between the low and high marks. I am thiking of developing some goo to put in the crankcase just to dirty the oil so the bleeding dip stick can be read!
....or not.
BGL
05-29-2003, 05:16 PM
#11
Rennlist Member
BGL,
hold the dipstick and then rotate it until the oil on it starts to reflect light/glisten. The dipstick itself is less reflective than the fluid surface, and the contrast will be clear. In other words, rotate from a straight-on/perpendicular view of the fluid/dipstick surface,
e.g. from -> | to -> / (or almost -> _ ?
)
Always works for me. Sort of like reading a mercury thermometer.
Does this make sense?
-Dave
hold the dipstick and then rotate it until the oil on it starts to reflect light/glisten. The dipstick itself is less reflective than the fluid surface, and the contrast will be clear. In other words, rotate from a straight-on/perpendicular view of the fluid/dipstick surface,
e.g. from -> | to -> / (or almost -> _ ?
) Always works for me. Sort of like reading a mercury thermometer.
Does this make sense?
-Dave
05-29-2003, 06:23 PM
#12
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Dave,
Your suggestion does make sense. It just seems to me that the oil is always smeared on the stick, such that it is very, very hard to tell what the real level is.
I suppose I need more practice. I have taken to using the gauge, although I know that can be tricky as well.
BGL
Your suggestion does make sense. It just seems to me that the oil is always smeared on the stick, such that it is very, very hard to tell what the real level is.
I suppose I need more practice. I have taken to using the gauge, although I know that can be tricky as well.
BGL
