reno808

WHAT is MORE IMPORTANT OIL PRESSURE OR OIL TEMP or i am comparing apples and oranges?? What i am trying to do it not to ruin a bearing or damage anything due to oil. I am putting on a 951 S oil cooler along with the current oil cooler.

Larry Herman

Apples and oranges, guy. You need to have sufficient oil pressure 40~60 lbs to insure that a film of oil remains on the bearings, and the temperature has to be in a reasonable range 160~220 degrees F for best lubricating qualities. Outside of any of these parameters, you are asking for problems.

M758

In a 944 engine pressure is more important. This is due to the weak oil flow to the number 2 bearing. However when the oil gets too hot the first thing is that the pressure drops.

I think you are worried about two oil coolers causing reduce oil pressure due to extra fiction. I do not think this is a concern. I believe the stock oil pump creates sufficent pumping pressure & volume to support and additional oil cooler.

Veloce Raptor

Yea, verily

smokey

Rule of thumb for a 951: never let the oil pressure drop below 4 bar at 6,000 rpm. Pressure is all that matters. Oil could never reach a temperature that could damage the bearings due to temperature alone. Different oils will have different viscosity at different temperatures, and Amsoil and Redline seem to be the best.

reno808

i use 20/50.

enthusiast

Your comment on the temperature is not clear. If the oils temperature limit is exceeded, it no longer performs to standards. The oil does not recover when it cools off and has to be replaced to provide proper protection to the bearings and to perfrom its other tasks in the engine.

GhettoRacer

If you only can have one, you'd want pressure of course. but really though, you need to keep both under control.

RedlineMan

Obviously;

Pressure is the most important. Even 10psi is enough to keep it alive as long as this is not at full tilt. Pressure is pressure. More than seeing that you HAVE pressure, the gauge offers you the ability to monitor for CHANGES in pressure. If you're lucky, and have a gradual degredation, you can spot a trend early enough to save a grenade job. Otherwise, it is a complete fluke to look down, see zero staring at you, and get it shut off before it has melted.

In your case, I would want temp too. If you are tracking the car, you are pushing that engine moderately hard if you're running 16psi. I would want temp so that I could see the difference in cooling with the different setups. You could plumb the gauge in for the current setup, then switch it to read the drop after the 2nd cooler is added. There is no way to know how effective it is otherwise.

If I were you, I would get the temps from the current setup first to judge your need. Then, if you feel you need more cooling (over 230*), I would look into 1 modern cooler to replace everything. Cooler technology has come a ways in 20 years, and daisy-chaining coolers sometimes REDUCES the effectiveness because of increased restriction.

reno808

RedlineMan interesting. I have found this web site that can have both in one http://www.spa-uk.co.uk/design/temperaturegauges.asp maybe this should help with the delema

A.Wayne

Oil pressure and oil temp are phased to each other . high oil temps will produce low oil pressure , 10 psi at 150 deg will offer more protection than the same 10 psi at 260 deg. you need to know both in order to protect and evaluate your engine's condition and oil pressure ...

RedlineMan

Yeh... neat...

But you go broke quick buying their stuff!