If you are driving a Pre 1983 Porsche 911 with the stock oil trombone cooler, where the local summer temperature might exceed 80 – 85 degrees in the summer, you will find yourself with oil temperature readings hovering at a blistering 250 to 270 degrees F. Even if you are not in a warm climate area, simple idling, such as in a traffic jam will have oil temps climb beyond belief. So owners that have cars on the track also know very well the issues of extreme oil temperatures for your ending. The Pre 1983 Porsche 911 ideal temperature is best at around 230 degrees F as cooler car temperature won’t cause oil viscosity breakdown and thus engine parts do not wear down as fast. Could it be that you are wondering about getting your Porsche 911 an Oil Cooler Upgrade?
The fact is that for warm days and /or hard driving, your stock trombone cooler is not enough to keep your car cool. Therefore the following line of action needs to be removing the entire older stock trombone line and replacing it with brand new lines, thermostat and oil cooler. The task isn’t particularly difficult, you just need to know some plumbing and under the passenger side wheel well fabrication skills to pull it off.
You must remember, that having the oil cooler alone is not going to keep your oil temperature at lower levels. We all know that when driving, oil gets hot and there isn’t anything you are going to be able to do about it other than shutting off the car and letting it sit to cool down. However, if you happen to be using the BAT / MOCAL radiator 44 fin vs. 6 – 24 copper tube solution, cold air drawing in rushes the flooded hot oil, with fresh cold air. The cold air brings down the boiling oil temp and returns it back to the oil tank. This trick, along with fittings and thermostat will better arm your car against that heated oil which causes viscosity breakdown.
A common and proven solution includes replacing a right side horn grill with a plastic air scoop that allows air to flow in from the outside flushing the radiator as the car is moving. Often, an electric fan combined with the radiator might be used to further blow cool air quickly rushing oil temperature to a more manageable levels of extreme hard driving. These two solutions working together act well to keep the oil cool.
For the later model of Porsche (1983), oil cooling was a known issue. They provided an “indentation” between the right bumper and valance for air scooping. This lip indentation only appears on the one side.
For racing, where maybe an headlight is not used, it is common to removal of the right headlight and replacing it with a large funnel scoop could also be a source for getting colder air to an oil cooler. Often the wing well will have a grill over what used to be the headlight. Having such an upgrade often makes a great solution in completing the car.
Other creative ways to reduce oil temperature is having finned hard line to and from the oil tank. The concept behind the fins, is that more surface area touches the pipes and therefore adds to drawing the heat away before and after it goes to the oil cooler. Secondary larger finned pipes have been seen and used to further add to pulling more heat out away from the oil lines.
Keep in mind that having such lines will require you to use just about the number of quarts required for a 911. But you need to check it. Also know two that when changing oil out, you need to make sure all for this draining of the oil lines. Never the less always avoid overfill the oil tank. Reducing or preventing oil from getting red hot is always the main goal.