GregInBoulder

I recently added both the oil filter collar and small front air scoop (replaces right side marker light) to my '83 SC Cab. Most of my recreational driving is at altitude, between 5,000 and 10,000 ft. Although it's been very hot in the last week, ambient temp around 90 degrees, I didn't see a significant difference. Temp gauge will still climb to 250 degrees on a hard, extended climb. When it reaches that point I generally back off. Bill's comment was the first I had seen noting acceptable high temp rage. I also noticed another cooler under the from nose of the car. Might be a stupid question but does anyone know what it's for? Additional AC cooling perhaps?

87slant-nose-cabriolet

GreginBoulder,
you are going higher in altitude, which
has less dense air and less cooling effect.
you didn,t mention are you running a sysnthetic oil. start cheap then work up in dollars.
Keith

Bill Gregory

The other cooler under the front is, as you guessed, for air conditioning. If you open your front trunk and look at the right hand front next to the battery, you'll see the fan that blows air over it.

If you find temps regularly running up to the 250 degree range, as Keith suggested, I'd be running a synthetic, like Mobil 1 15w50.

ked

For the "2 Bill's" (Gregory & Verburg), and anyone else who might know... What is the airflow rate (cfm or ...) of the front Aux. AC Condensor Fan in a Carrera? The unit seems pretty hokey to me, and at $250, I think I might fabricate something from available 12V fans that will work at least as well, longer, & cheaper. Thanks in Adv...

GregInBoulder

O.K. I just got back from a 400 mile run to Steamboat. I'm running Castrol Syntec 5W-50. Once again I seem to top out at 250 degrees on the hard climbs (the downhills are great (there is no substitute). I'm not running the AC. I'm wondering now if the mixture is to rich, the last tune I had was at 5,000 feet and the passes are between 9K and 12K. Another guess is the oil thermostat might not be opening all the way?

rsneunelf

Hey,

OK, our 911 has a 4 tube finned cooler (made by terbatrol). I have a hole cut into the front right headlight bucket with a screen over it. I also run Mobile 1 oil in the car. By placing the hole in the headlight, the car became substantially cooler. The engine is a 2.7RS spec engine in a 1965 911 chassis. The cool collar arrived today and I think it can only help. I agree that it is basically a heat sink. The tests with the cooler all indicated that large amounts of air needed to be circulated across the cool collar to make it work best. I have a couple of plans to help with that. The first plan is to do nothing and see what happens. The second plan is to move air across the collar by placing a tube from under the car to move the air across the collar. The last plan is to use a 12 volt fan to pull air across the collar. I will let you know how it goes.

Thanks for all the help.

Andy

Dial 911

GreginBoulder,
After a spirited run, reach under the fender and put your hand on the loop cooler. If you burn yourself, the thermostat is probably open.

rsneunelf

Hey Greg,

I ran it really hard and the car would not go over 210. The oil cooler was hot, but not as hot as it used to be. The "hole in the bucket" worked pretty well. I know this is not a practical technique for most Porsches. Our's is a race car, barely street legal.

Sorry to hear that your 911 is getting so hot. A good hard run in our mountains can really heat them up, and we had that long run of >90 degree days. Have you tried that little scoop that goes on your front right signal? It redirects air onto your oil cooler. They say that you do not have to cut or drill the car, but I am not sure about that. I think that Pelican sells it.

Hope this helps.

Andy