FWIW my 1998 Jeep Grand Cherokee with 200k miles always runs at 210F.

What is the temp on water cooled 911s?

Happy driver, today it was 95 + and humidity very high. Drove though 4 cities mid day with AC on and never got above 205. Lots of stop and go and sitting at stop lights. Running real good.

My 84 3.2 runs on the hottest days at the line below the red at about the 10:00 position. I just dont know how hot that is. Usually it is at the 8:00 postition. Wish I knew what those temps are.

90 and 120 C

I am most impressed that you were able to comfortably use the AC in mid day for the duration of 4 cities!!!

You have a SC or Carrera?

210

In my car there is a noticable performance increase when I go from 200ish to 210.

FWIW most thermostats are calibrated to 195 degrees F.

86 carrera with the original AC system running freeze 12. Yes I notice a bit of performance increase once I hit 190 also. Seems like it runs the best between 190 and 210. It was worth the effort to install a cooling fan on the front oil cooler. I used the elephant kit that allows you to adjust the on temp for the fan. The fan that is sold with the kit would not fit even with severe mods unless I eliminated the fender bracket and that wasn't happening. Had an extra spal fan from adding fan to rear AC condensor (I was going to add 2 of them but one worked out fine) and that fan fit perfect with a slight mod to the horn bracket. Can't return the elephant fan as I tried to modify it to fit the cooler without luck.

Running the front fan is not going to help if there is no oil flowing there below 200C. I notice my front oil lines get hot when my needle is about halfway, so that's ~220C. Is this the factory spec for opening the thermostat for the front cooler (not the engine one)?

Hardly anyone has answered the question.
There's a chart somewhere on this site showing engine wear as a function of oil temperature. It shows rather clearly a substantial increase in engine wear above about 200° F, and a dramatic increase after about 240°. So I'd like to stay around 200.

I'm not familiar with this chart, but would be interested to see it, as well.

Doyle

From Elephant Racing's site. Looks like up to 210 is all the same.

ELEPHANT RACING Tech Topic, Oil Temperature and Engine Life

http://forums.pelicanparts.com/uploa...1281474037.jpg

You found it. Yes, my earlier comment was a bit too pessimistic; you're fine to about 210°, then you begin to pay.

That chart is obviously dependent on what oil you are using, and how often you change it.

Better oil and more frequent changes will help, but i think the basic premis stands - engines do not last as long with hotter oil.

I've been seeing 250 and it is moving me to a front cooler pronto. What really scares the s*#t out of me is the indicated 30 psi at 3500 rpm.

Just got the car.
chris

Rule of thumb is 10psi per 1000 rpm so 30psi at 3500 isn't bad at all; certainly no cause for great concern. 250° is worrisome.

I treat 10psi per 1000rpm as a lower limit. 1 Bar is better. I would rather see 35psi at 3500 rpm.

I think we all would. But my 73T ran beautifully for ten years with pressures around 9psi per 1000. It did over 50 track weekends during that time and was running fine when I tore it down.

180 oil temp is ideal in the air cooled 911. 200 nothing to worry about. 220 made me nervous. Stock 911S never went past 220...that was across the Bonneville salt flats in July, running high speed.

Guys if 210-230 was fine for endurance racing I am sure our grocery getters can take it too. I look at things like oil break down temps etc.. and we are nowhere near it at these temps....

180 is VERY cold for an aircooled engine. Look at all the stock clearances built in..that is there for a reason and 180 is not it...