Do I have an Oil Pressure issue?
10-17-2006, 06:19 PM
#31
Rennlist Member
2fasfu, there are very few (if any) 5w30's that will meet the HTHS (high temp high shear) specs that are required for these engines...need an HTHS of 3.6 or higher...Redline 5w30 may meet it...You would be better served with a 0 or 5w40 synthetic. Just an FYI....
10-17-2006, 07:58 PM
#32
Originally Posted by bgiere
Thicker oil will indeed give you a higher oil pressure reading but the normalized flow (hot) should not change, just the pressure that is generated from pumping it! Motor protection is dependant on the volume of oil pumped to the surfaces which are cooled and lubricated by that volume, not pressure...if you feel better seeing a higher oil pressure on your gauge, thats OK, just be aware that pressure is no indictation of an oil doing any better at protecting things. Lubrication protection is determined by volume, not pressure.
The plain journal bearings used on the crankshaft, etc. in a normal automobile motor are supported by a surfboard type hydroplaning effect and require oil pumped in under sufficient pressure to keep this happening before the oil blows out the ends of the bearing. Everything here is designed as a system, bearing width, bearing clearance, oil viscosity, and pressure.
Without enough oil pressure feeding the bearing, the journal will collapse through the oil film and you'll have metal-to-metal contact. If this happens under load the engine is lunched rapidly (spun bearing, thrown rod, etc).
Too thick of an oil won't flow freely under the same pressures. And will cause all sorts of other problems in areas that are lubricated by splash and gravity.
Bill
10-17-2006, 08:24 PM
#33
Rennlist Member
wrljet, I will clarify...I was making the assumption that there were no internal problems and that the oil pump and lines were operating correcly...we do need pressure for the reasons you stated. Higher than normal pressure is not needed given an engine that is "in spec" and in some cases it can be detrimental. An engine that has pressure in the "normal" range shouldn't suffer from oil film collapse as long as it is in spec. Would you agree?
10-17-2006, 09:09 PM
#35
Rennlist Member
I do a little too much reading on this issue,but there is an oil guru named Doug Hillary who has a handle on Porsche oil specifics...I read all that I can find from him...He used to be a regular on Bobistheoilguy.com and occasionally posts here on Rennlist...I must credit him with most of my knowledge...the stuff I'm wrong on is usually my own!!
10-18-2006, 05:39 AM
#37
Intermediate
Join Date: May 2004
Location: Manchester UK
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 1999Porsche911
So, are you saying that coolant stays at 180? Not possible. (Bytheway, I grew up where you live). Your car cannot maintain 180F. Even in winter it is hotter than 180F. I suggest that you hook up a scanner and take a look at your actual engine temp, or use the diagnostic display on the climate control panel. Your coolant temp will surprise you when you see it as hot as it actually is. The Porsche gauge is meaningless as far as displaying actual temperature. Once you figure out the correlation to the temperture needle and the actual temperature, it is consistant, however.
Ian
10-18-2006, 10:58 AM
#38
Burning Brakes
Installed a new oil pressure sender, 54$ 996-606-203-00-M100. Oil pressure back to normal! A 19mm 45 degree angle wrench would have made it a very easy to change.
11-03-2006, 10:56 PM
#39
My gauge was pegging between 4.5 and 5 at only 2-3k rpm and the dealer is now replacing the oil pressure gauge....warrantied but I was told it is a $1400 job...I was shocked. The dealer blew me off the first time I mentioned I thought the sending unit or gauge were off......look to see if the gauge is reading even without the car being turned on....mine was.
05-22-2007, 01:43 PM
#41
Banned
Mine sticks at 4.7-5 while driving... idles around 2. Stuck at 5 while warming up driving.
Had a recent PPI done... compression/leakdown pegged the charts all six cylinders.
'02 w/ now 32K miles. 0w/40 Mobil 1.
Had a recent PPI done... compression/leakdown pegged the charts all six cylinders.
'02 w/ now 32K miles. 0w/40 Mobil 1.
05-22-2007, 02:59 PM
#42
Burning Brakes
Check part 23 and 24. I had replaced sping for no oil pressuer. Easy check, piston should slip out easy, could be jamed... not sure if possible. Do some reading on the oil pressure regulator.
http://www.pelicanparts.com/PartsLoo...-00-Frame3.htm
Chris
http://www.pelicanparts.com/PartsLoo...-00-Frame3.htm
Chris
