250 degrees F. "Too damn hot"

[gaijinda]

I was seeing 250 degrees (my oil, not spins)during a DE event at Watkins Glenn. Anderson says this is "too damn hot". As I would see this only on the final few minutes of my run group, do you guys think I could get away with a few more events before I make the proper external oil cooler upgrade next winter. (BTW: have a '73 MFI "T"). Thanks.

[Bill Verburg]

If you use Mobil 1 synthetic oil the oil will be ok. But the older seals will not be. Newer cars have much improved seals which can deal with those temps, for a short while. If it was my car I would get a nice big cooler in it right away and not worry any longer.

[RarlyL8]

I agree with Bill but would add that your cool down period becomes more critical than your peak oil temperature. Properly cooling the car down (to under 200F) before shutting the engine off prevents the dreaded "heat soak" that spikes temperatures even higher than those observed when running.

[Early_S_Man]

Unless you have had a top-end rebuild and are quite certain that your valve guides are not worn, I believe you are tempting fate ... and a dropped exhaust valve head, by running hard at a DE event with those kind of high temps and the extra stress inherently involved. You can probably get away with it, but ...

It was not any particular seal that was improved that alows the use of Mobil 1, but the 'improved' sealing compound used between heads and camshaft housing, etc. beginning in the '80s. A top-end job using Loctite 518 or 574 would improve your engine's ability to retain Mobil 1 considerably! The Loctite 518 instructions include 'prepping' of paper gaskets, so I would recommed that as well for the cylinder base gaskets, and the gaskets at both ends of the chain housings, as well.

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Warren Hall
1973 911S Targa

[emcon5]

Had a strange temp problem the other night. Went through the drive through at 2 fast food places, (got my food, drove across the street and got wife's food) and my car got really hot. Total time at idle was probably 15-20 minutes, and my temps were pushing 240. As soon as I started moving and got some airflow across the oil cooler, they dropped right down to about 190. It has never done this before.

I am guessing this is not normal. Car is an 82 SC coupe, with a Carerra cooler. Outside temp was probably around 70F.

What can cause this?

Tom

[Swank911]

I am curently seeing 210 regularly, even at (legal) highway speeds. In a 73 with a 2.4, is there an external oil cooler, or just the reservoir?

[needlevalve]

Shortly before I realized that my valve guides needed replacing (I am currently doing this), I was reaching pretty high temps. I hit 250 on I91 in Vermont after pushing the car pretty hard. Bear in mind I have no secondary oil cooler, but I speculate that the worn guides decreased heat transfer efficiency and thus raised my overall operating temp. Hopefully the old girl runs a little cooler once I get her back together.

It'll put a scare in ya when you look down and see that 250..."too damn hot"!

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Matt Macpherson
1975 911 S
nvalve@yahoo.com

[Ted Stringer]

Whenever I sit and idle for any amount of time mine creaps up to about 235 - 240. I wouldn't get to fussy about this because it only happens when you are sitting still. If you are still worrying about it add the cooler upgrade with fan. I still need to do this to mine (I have the trombone) and I am adding a switch that will override the thermostat so I can turn the fan to always on.

and yes I can't spell and the edit post function dosen't have the spell check

[This message has been edited by Ted Stringer (edited 06-26-2001).]