Sep 6, 2008 2:00:03 AM
- Stephenkng
- Pilot
-
- Loc: S.F., CA , United States
- Posts: 356, Gallery
- Registered on: Oct 5, 2005
Crown
Board: Porsche - 911 - 997
Language: English
Region: Worldwide
Close
CloseForum - Thread
Sep 6, 2008 3:43:43 AM
- Grant
- Rennteam VIP
-
- Loc: Denver, CO , United States
- Posts: 12588, Gallery
- Registered on: Aug 21, 2002
- Reply to: Stephenkng
Re: Oil pressure @ 4 - 4.5 bar when engine @ operation
That is a normal oil pressure for medium to high engine speeds. I assume by "on and off" you mean when the motor is idling it is low and when the motor is running harder the pressure is higher?
The old rule of thumb is that the oil pressure is approximately 1 to 1.5 Bar per 1,000 rpm and does not exceed 4.5 to 5 Bar at any engine speed. The oil pump is mechanically driven and its speed is proportional to engine speed (revs). Pressure increases with revs.
Also, pressure is higher when the oil is cold, since the viscosity is much higher then.
The old rule of thumb is that the oil pressure is approximately 1 to 1.5 Bar per 1,000 rpm and does not exceed 4.5 to 5 Bar at any engine speed. The oil pump is mechanically driven and its speed is proportional to engine speed (revs). Pressure increases with revs.
Also, pressure is higher when the oil is cold, since the viscosity is much higher then.
Sep 6, 2008 3:51:52 AM
- Stephenkng
- Pilot
-
- Loc: S.F., CA , United States
- Posts: 356, Gallery
- Registered on: Oct 5, 2005
- Reply to: Grant
Re: Oil pressure @ 4 - 4.5 bar when engine @ operation
Actually, it was at 4 - 4.5 bar at idle when it is at full operation temp. When I said on and off, I mean some time it does that and other time it is what I call normal that is at 1.5 bar at idle. I have the car since new and it is at 21k now. The pressure is alway at noramal as you describe until recently acting strange.
Sep 6, 2008 5:10:14 AM
- Grant
- Rennteam VIP
-
- Loc: Denver, CO , United States
- Posts: 12588, Gallery
- Registered on: Aug 21, 2002
- Reply to: Stephenkng
Re: Oil pressure @ 4 - 4.5 bar when engine @ operation
Quote:
Stephenkng said:
Actually, it was at 4 - 4.5 bar at idle when it is at full operation temp. When I said on and off, I mean some time it does that and other time it is what I call normal that is at 1.5 bar at idle. I have the car since new and it is at 21k now. The pressure is alway at noramal as you describe until recently acting strange.
Oh, then it sounds like you most likely have a malfunctioning oil pressure sender or a loose ground somewhere.
Sep 6, 2008 6:26:02 PM
- Stephenkng
- Pilot
-
- Loc: S.F., CA , United States
- Posts: 356, Gallery
- Registered on: Oct 5, 2005
- Reply to: Grant
Re: Oil pressure @ 4 - 4.5 bar when engine @ operation
Quote:
Grant said:Quote:
Stephenkng said:
Actually, it was at 4 - 4.5 bar at idle when it is at full operation temp. When I said on and off, I mean some time it does that and other time it is what I call normal that is at 1.5 bar at idle. I have the car since new and it is at 21k now. The pressure is alway at noramal as you describe until recently acting strange.
Oh, then it sounds like you most likely have a malfunctioning oil pressure sender or a loose ground somewhere.
I am thinking the same thing. I will talk to my service adviser when I take mine in for the annual oil service toward the year of the year.
Sep 7, 2008 12:53:43 AM
- Stephenkng
- Pilot
-
- Loc: S.F., CA , United States
- Posts: 356, Gallery
- Registered on: Oct 5, 2005
- Reply to: Stephenkng
Sep 7, 2008 1:50:45 AM
- MMD
- Rennteam VIP
-
- Loc: usa
- Posts: 9652, Gallery
- Registered on: Dec 16, 2004
- Reply to: Stephenkng
Re: Oil pressure @ 4 - 4.5 bar when engine @ opera
Quote:
Stephenkng said:
Is it only me got this "problem". Can anyone share with their experience if any. Thanks.
I'm still not sure from the above posts.
When you are doing 60-70-80 mph is your oil pressure needle pegged (at 5+)?
If so my bet is you'ver got nothing to worry about.
How about this?
Does your P-car dealer/service sell/service other mfgr's cars? Maybe some chimp-brained assistant service guy thought non-Mobil1 oil used in other cars would be just fine for yours.
Get them to do an oil change (or do it yourself) with known Mobil1 and see if there's a difference.
Tomorrow's Sunday: give yourself a simple oil change. See if problem is solved. You can get crush washers for the oil plug where you buy the oil. BTW, probably no need for you to change filter at this point (unless you have one in your garage).
Sep 7, 2008 2:14:16 AM
- Stephenkng
- Pilot
-
- Loc: S.F., CA , United States
- Posts: 356, Gallery
- Registered on: Oct 5, 2005
- Reply to: MMD
Re: Oil pressure @ 4 - 4.5 bar when engine @ opera
MMD. Thanks for your advise. However, I don't think is the oil. I got my 20K service in Jan this year that is 9 mos ago. The oil pressure always been "normal" since new until recently (last 2 - 3 weeks). 80% of the time I have "normal" oil pressure and for whatever reason, on "selected" day, I have this "high" oil pressure issue. I think I maybe sansor or oil pump issue. I don't know and that is the reason I post the question here. I hope I can get some advise before I talk to the service advisor.
Sep 7, 2008 3:47:06 AM
- Grant
- Rennteam VIP
-
- Loc: Denver, CO , United States
- Posts: 12588, Gallery
- Registered on: Aug 21, 2002
- Reply to: Stephenkng
Re: Oil pressure @ 4 - 4.5 bar when engine @ opera
Quote:
Stephenkng said:
MMD. Thanks for your advise. However, I don't think is the oil. I got my 20K service in Jan this year that is 9 mos ago. The oil pressure always been "normal" since new until recently (last 2 - 3 weeks). 80% of the time I have "normal" oil pressure and for whatever reason, on "selected" day, I have this "high" oil pressure issue. I think I maybe sansor or oil pump issue. I don't know and that is the reason I post the question here. I hope I can get some advise before I talk to the service advisor.
It's almost certainly not the oil pump. It's the sender, wiring, or gauge (in order of probability).
Sep 7, 2008 4:27:23 AM
- Stephenkng
- Pilot
-
- Loc: S.F., CA , United States
- Posts: 356, Gallery
- Registered on: Oct 5, 2005
- Reply to: Grant
Sep 7, 2008 12:51:21 PM
- pnoble
- Co-Pilot
-
- Loc: Short Hills, NJ , United States
- Posts: 231, Gallery
- Registered on: Sep 18, 2004
- Reply to: Stephenkng
Re: Oil pressure @ 4 - 4.5 bar when engine @ opera
My oil pressure gauge on a 2005 C2S has been pegged at 5 at all times since I got the car. I actually asked my dealer about it initially, since I assumed a pressure gauge on a car, like a temperature gauge, would be scaled to show some middle value under normal use. I was told pegged at 5 was normal.
49,500 miles later it is still maxed out at all times. I shift typically between 3-4,000 RPM and rarely go above 5,000 RPM.
Upon ignition and with the engine at idle, the needle rises to 5 in under 5 seconds and stays there until I turn the engine off.
49,500 miles later it is still maxed out at all times. I shift typically between 3-4,000 RPM and rarely go above 5,000 RPM.
Upon ignition and with the engine at idle, the needle rises to 5 in under 5 seconds and stays there until I turn the engine off.
Sep 7, 2008 7:11:44 PM
- Stephenkng
- Pilot
-
- Loc: S.F., CA , United States
- Posts: 356, Gallery
- Registered on: Oct 5, 2005
- Reply to: MMD
Forum
About Rennteam | Help | Terms of use | Privacy Policy | Support | Contact | Imprint | Archive
Powered by
Community
and
