Fantor

Will do. Thanks guy's....

syzygy

From what I understand you should have APPROXIMATELY one bar of pressure for every thousand RPM when the engine is warm. One bar at idle is normal, two at cruise (3000ish RPM?) is fine and four bar at high revs.

rusnak

Chuck used to have (maybe still does) a nice article about heat and oil viscosity, and how oil breaks down under too much heat. The thicknes of the oil provides a cushion for lack of a better word, for engine bearings and wear surfaces. Under too much heat the oil thins out to the point that the engine parts will begin to wear out. check out Elephant Racing's website to find it.

irobertson

20w50 acts like SAE 20 when cold and SAE 50 when hot.
It is thin enough to flow properly when your motor is cold, yet retains enough viscosity when hot to still provide protection.

SAE 50 will not flow through the engine when cold, and that is a very bad thing.

cheers

Tango635

Will be doing this to my engine. Once the engine is warm, I have about 1/2 bar, and 3.5 bars while cruising at 60 mph. 1/2 bar is much too low!!. My local dealer, Momentum, doesn't stock these, so will have to order.

I notice that the write up in the first post says reduces oil pressure by "almost 50%". I wonder if there is an easy way to confirm this. The hole on the new piece is much smaller, but I guess the added back pressure compensates for some of the area loss.

Fantor

Hey Guys:

I got my oil changed this weekend at German Tech here in Clearwater/Largo FL. These guys seem to know there stuff. The owner Joe has been a master Porsche mechanic for 35 yrs and they have Porches of all types in there work bays and on the lot...:-) Anyways, I had them put 20w50 oil in my 911 and the oil pressure has increased a bit. I have a little over 2 bars at curse and about 1 bar at 1000 rpm idle. According to Peter Z and the German Tech guys this is ok and about average for a 1970 911.

HOWEVER, now after the oil change I seem to have a main oil seal leak when I turn the car off. I never noticed this leak before, and it seems to be leaking about 8-10 drops of oil each time I turn the car off and park it. I have always heard that Porches were notaries for oil leaks, so is this considered a "BAD" leak that needs fixing ASAP or is it normal???

Thanks Again: Fantor

Peter Zimmermann

Is the oil dripping from the crankcase directly to the floor, or is it dripping onto a heat exchanger, and then to the floor?

Fantor

Peter, Crankcase to the floor. My 911 does not have heat exchangers. it has RS style custom Headers.

Fantor

CorsePerVita

I hate to beat on the horse....

I've been researching all over the place and this seems to be the best thread I can find so far with the info. I exclusively use brad penn on my 914. I live in a fairly cold environment in the winter, we'll hit as low as -15 when it gets REALLY cold. And then we'll have warm spurts in the winter where it'll hit 60 sometimes more.

During summer it'll get low 40s and sometimes during the day hit 80s or 90s.

Is 20w50 brad penn a good choice all around for such a climate for my 82' 911 SC??