Would like opinion on engine cooling devices.

[Pauls 89Cab]

I am interested in keeping the heat down, especially in the valve train. Are people using the Heat Sheet and finding it useful? I have also seen the Cool Collar for the oil filter and the oil cooler air scoop. Any other devices or opinions on these?
Thanks, Paul

[Obin Robinson]

the best way to cool the engine... water

heh heh, seriously though... is your car getting unusually hot? as odd as it may seem, synthetic oil may keep some of that heat down. have you tried Royal Purple? i have heard that it lowered oil temps (and therefore engine temps) because it is so slippery and efficient.

also, have you checked the oil cooler thermostat?

as far as the Heat Sheet and Cool Collar, that stuff works. i have friends that use it and they all said it made a noticeable difference in their cases.

in any case, good luck!

obin

[wckrause]

I got a copy of the test procedure used to test the effectiveness of the cool collar. It was bench tested with a high speed fan, tested on a corvette, and tested on a air cooled motorcycle. All three showed a reduction in oil temps of about 12%. However, in all three tests, there was an ample supply of ambient temp air over the cooling fins. In my opinion, there is no way to supply this air to a 911 oil filter so I don't believe the cool collar will work for 911's.

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Bill Krause
'79 911SC Euro

[Doug Zielke]

Paul,
This may or may not be an option for you, but I found removing the CAT made a substantial difference in engine temperature. The cat is *very* close to the drivers side valve cover, and radiates a lot of heat into it. The test pipe I installed, has much more air space between it and the valve cover. The engine compartment is now cooler as well, not to mention the rear tire on that side.

Regarding the "Cool Collar" type device. I have one on my H-D m/c. It works because the oil filter on a Harley is in front of the engine, in the airstream. But the surface area of it is rather small compared to a proper oil cooler (radiator).

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Doug
'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
members.home.net/zielke/911SC.htm

[This message has been edited by Doug Zielke (edited 06-07-2001).]

[island911]

Dang, Bill and Doug beat me to those points.
Well then, you have advice from a third engineer. . . .buy a test pipe, rather than cool collar, you'll get better temps, performance and milage . . .but only on the track of course.

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'81 Platinum Metalic SC Coupe

[911pcars]

The folks who brought you HeetSheet have introduced MPC (multi-purpose cooling), a mobile water mist delivery system. Although not necessarily designed for Porsches, this device may have uses for specific cooling situations.

http://www.seinesystems.com

Sherwood Lee
http://members.rennlist.org/911pcars

[Jerry Madderra]

I think some of you engineer types are missing the point about these suplemental, cooling devices, cool collar ,cooler air scoops, heatsheets. none of these alone are going to make any drastic reductions in temperature on the 911. I spent $400.00 to up grade my front oil cooler and got the same amount of reduction as installing a $100.00 air scoop. All of the advances we can make taming the temps are going to be baby steps without spending big bucks and making drastic changes to the car .Everyone does not a pentagon budget nor are they interested in cutting big holes in the front of their cars like that ugly new turbo that looks like a feeding fish. To answer another question, the amount of air going through the 911 engine bay is in the thousands of CFMs at highway speeds which provides plenty of airflow to the cool collar to carry away the heat, also the cool collar is not a raditior that is intended to be cooled by a fan , the cool collar is a heat sink meant to conduct heat and radiate that heat to the surrounding air faster due to its greater surface area. somtimes we look for that magic bullet when in fact its in the details . I am done ,you can all go back to the regular programing--jerry

[island911]

Jerry, are you saying that an engineer is going to come up with the $400 sol’n rather than the better $100 air scoope? If there is one thing engineers are good at it is accomplishing, for $1, what anyone can do by spending $4.
It's the sales guys who will convince you to spend the extra $'s under the guises of performance increase; not the engineer. Some times “sales guys” are politicians, who want toilet seats built in their state at $1000 each; but that has nothing to do with engineering. . .except on the space shuttle where the **** really hits the fan.

Also, to cool your house in the summer, tell me you can achieve this "suplemental cooling" with the “baby step” of leaving open the refrigerator door. After all, there is plenty of cold air produced by your refrigerator! . . .LOL
. . .Entropy is the concept of the day. Learn about entropy, in the context of thermodynamics, and then tell me who's missing the point.

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'81 Platinum Metalic SC Coupe

[This message has been edited by island911 (edited 06-10-2001).]

[kepperly]

THROUGHOUT THIS BOARD I,VE READ ABOUT FELLOW
911 OWNERS *****ING ABOUT HIGH OIL TEMPS WITH
EXPENSIVE SOLUTIONS.WHY HAS,NT ANYONE FIGURED OUT HOW TO TURN ON THE COOLING FAN EARLIER ON THE SERIES OF 3.2 CARREAS EQUIPED WITH THE FACTORY COOLER.WHY NOT REPLACE THE FAN SWITCH (THE ONE LOCATED ON THE COOLER BODY)WITH ONE THAT TURNS ON BEFORE THE OIL STARTS TO GET TOO HOT?
TODAY I FOUND BOSCH,S WEB SITE AND EMAILED THEM A QUESTION TO THAT END, SO FAR NO ANSWER
BUT AT LEAST I,M TRYING TO ACHEIVE THE LEAST
OBTRUSIVE FIX. I E-MAILED THEM THE STOCK PORSCHE PART #930.606.115.00 (THATS OFF THE TOP OF MY HEAD SO IT COULD BE WRONG) AND ASKED THAT THEY RESEARCH THEIR PARTS FOR (ASSUMING THEY MADE IT FOR PORSCHE) AN IDENTICAL TEMP SWICH W/ A LOWER ACTIVATION
TEMP. I,M JUST ONE GUY AND THEY COULD BLOW ME OFF BUT WHAT IF 10,100,1000,10000 911
OWNERS ALL E-MAILED THEM. LETS LET THEM FIX IT W/ A ?$ SENSOR THAT ALL WE HAVE TO DO IS
UNSCREW THE OLD ONE AND SCREW THE NEW ONE IN!!!!!! DON,T THANK ME JUST E-MAIL BOSCH!!

[emcon5]

Well, actually that has already been done.
If you go to the Pelican parts catalog for SC and Carerras, then to "Oil circulation", then to the section on "External Oil Coolers", you will find a heading entitled "External Oil Cooler Thermoswitches"

You will find 91º and 99º thermoswitches, compared to the 110º stock one.

Or you could just click here:
http://www.pelicanparts.com/catalog/shopcart/911M/POR_911M_oilsys_pg3.htm

Tom


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82 911SC Coupe

[83 sc euro cab]

The oil travels through the oil lines so why not put smaller and longer cool collars over those?

maybe have 5 or 6 small cool collars over the oil lines.

[Wayne 962]

This is a very interesting thread, as we have manufacturers of these products in-cognito in this thread (I'll let you figure it out).

Anyways, I'm not out to sell you an egg, just give you the dirt. Here it is:

- Carrera Oil Cooler ($1200 w/fan) With the fan it's better than the brass oil cooler. Without the fan, maybe not, maybe about the same. The brass cooler is NOT the trombone cooler, but a European cooler not found too commonly in the states.

- Cool Collar. Common sense would say that this wouldn't work too well, but I have seen proven test results that it does. Also my customers have also tested it themselves (not believing that it actually works), and have found that it does. We should offer money-back guarantee on this, as it does live up to it's claims. (I believe that it can lower temps by 10 degrees or so on average)

- Oil Cooler Scoop. Another good one. This is also proven to work by our customers who use them. It's common sense - get more air to the cooler = better cooling. Changes in temps seem to vary from car to car, but it would be about 10-20 degrees.

- Synthetic oil. I can't see too much how this would improve the temps of the car. Thinner viscosity = better cooling at the surfaces? I'm not sure. I haven't heard too many people using the synthetic as a 'cooling' solution.

- The Heat sheet makes sense. Supposedly there can be an 80 degree differential with the sheet installed (difference in temps between the heat exchangers and the lower valve covers). I have not tested this product, but it certainly seems to make good sense to me.

- 11 Blade fan (if you don't have one already) for the 1974-77 cars
- Cooling Tin Modification (for the early engines). This actually reduces temps by a lot.

I don't think that removing a properly functioning CAT would help to reduce your temperates by any significant degree.

Just my take on this...

-Wayne

[feelyx]

I would like to find an external thermostat the opens at 160 instead of 200. Does anyone know where to find the parts?

Tim in Sac

[kepperly]

wayne,
emcon5 relied to my post bye listing your
advertisment for the lower temp swich i,ve been looking for. i followed the tread to
your part #s 61-31-1-364-273 and 61-31-364-27291 at a very resonable price of $18.50.
the only problem i see is the original had 1
contact terminal and the lower temp units have two! what if any wiring modification has to be made? or does one just connect the
lead to only one terminal.
thanks keith

[emcon5]

Originally posted by feelyx:
I would like to find an external thermostat the opens at 160 instead of 200.

As the engine operating temp is 194º, wouldn't this be a bad idea?

Tom



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82 911SC Coupe

[Jack Olsen]

As I understand it, synthetic oil won't cool the car (how could it?) but it can hold up at higher temperatures, which can be reassuring if you're on the edge of too hot anyway.

Cool collar seems to be snake oil, but at $40, it seems like cheap snake oil, relative to most Porsche parts costs. Anyone got a good source for the kind thermal grease that helps computer heat sinks to more efficiently draw heat from computer CPUs?

------------------
Jack Olsen
My Rennlist home page • My Pelican Gallery page • My Porsche Owners Gallery page

[This message has been edited by JackOlsen (edited 07-24-2001).]

[emcon5]

Not sure about a good source, but these guys make the thermal paste stuff.

http://www.arcticsilver.com/

[lsolon]

Here's a cheap one. Install heat sheet. Go to thermo-tec's website, buy there aluminized heat barrier with adhesive backing. Adhere it to the heat sheet. The barrier reflects heat up to 2000 degrees. While your at it buy their header wrap and wrap the heat exchangers. I have seen this on some porsche race cars but, of course they wrapped their headers. All this will cost around $100. Should help some.

[Jack Olsen]

I got the thermal silver grease from:

http://www.hardcorecooling.com/

I got the cheaper stuff in the 20g tube. I'm going to give the cool collar all the help it can get.

Maybe there's a way to duct air from a side duct like the Boxsters and Turbos.

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Jack Olsen
My Rennlist home page • My Pelican Gallery page • My Porsche Owners Gallery page

[emcon5]

Originally posted by JackOlsen:
Maybe there's a way to duct air from a side duct like the Boxsters and Turbos.

Well, I suppose you could use some sort of oil filter relocating kit and move the filter to the right rear wheel well. There has to be some air flow there from the tire spinning.

I don't know if anyone makes them for 911's, but something like this would probably work.

http://www.perma-cool.com/Catalog/Cat_page27.html

They even sell a double filter setup, so you can use 2 filters with cool collars.

Tom

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82 911SC Coupe