Cool collar

[ras911]

I just received a cool collar from Pelican.
I had replaced my compressor a couple of years ago and I don't have room to fit the collar over the filter due to the fittings from the A/C. Since I wasnt really convinced about this in the first place , I am wondering if the collar would be semi-effective if I cut it in half and then installed it???




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Bob
1982 911SC Targa
PCA - Founders Region

[wckrause]

It will probably be just as effective.

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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY

[Jack Olsen]

Put another way: it will only be half as ineffective.

(That said, I recently got one. I think it's snake oil for a 911, but if I'm wrong, it doesn't bring much of a weight or a dollar penalty.)

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

[Doug Zielke]

No, No! Don't cut it up!
If you do, how are you going to send it back?

(Hint: It's worthless; spend your money on a proper oil cooler).

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'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
The Blue Bomber's Website

[ras911]

I agree I am somewhat dubious about this thing but I figured for 40 bucks , what the heck. If it really doesn't work as a whole piece and I installed it I couldn't send it back anyway. But,if this was to somehow, miraculously, give me 5 or 10 off,I would be very happy.
So I come back to the question , would it really make a difference in principle, If I go home and get out the hacksaw?
I may be a gineau (sp?) pig here for less than the cost of a fine bottle of wine but none of the benefits!





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Bob
1982 911SC Targa
PCA - Founders Region

[lagoon]

I have installed the same item. It is a little tricky, but you can get it over the a/c hose and on to the filter with a little jockying. It seems to help bring temps dowm about 10 degrees. If you need help installing, let me know. 81'SC

[Formerly Steve Wilkinson]

Good lord, they're selling these things for $40? I got one from J. C. Whitney for $15, used it on my airplane's Lycoming engine and now have it on the Porsche. For $15 and a few ounces, I figure 1/it can't hurt, and 2/it causes people to go, "whuzzat," which is always fun.

Stephan

[Jack Olsen]

There's nothing magic about the cool collar. It effectively increases the outter surface area of the oil filter. If you cut a section off of it, you'll reduce its effectiveness by the portion you trim off. If God were to smile down on us foolish consumers and the thing gave five degrees when fully utilized, then I'd guess removing 20 percent of the collar would mean you get four degrees lower temps instead.

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

[ras911]

That's it. I am going home, taking my kid to the pool and then, once I am fully cooled off myself, sawing my cool collar in half. Let's see what happens.........



[This message has been edited by ras911 (edited 08-07-2001).]

[jasonborkowski]

Ah yes; the Cool Collar, better known as "The Right Arm Killer/Cutter". I have cussed at that thing since the day of installation! Just when you thought it didn't see your arm when you were reaching for that last spark-plug--WHAMMM; it's got it's fins of death sunk into your skin!

HAA!

[island911]

OUCH! . . . but just think of the extra cooling benefit as the blood evaporates off the "cool" collar!

---

'81 Platinum Metalic SC COUPE

[This message has been edited by island911 (edited 08-07-2001).]

[Wayne 962]

For those non-believers (I was one too), this thing really seems to work. Brings down temps about 10 degrees (just about everyone agrees on that who's tried it...)

-Wayne

[rstoll]

Jason, I think you must have ordered the "cruel collar" by mistake.

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Robert Stoll
83 SC
83 944

[island911]

Originally posted by Wayne at Pelican Parts:
For those non-believers (I was one too), this thing really seems to work. Brings down temps about 10 degrees (just about everyone agrees on that who's tried it...)

-Wayne

Are you saying it brings down enginetemps about 10 degrees?

[wckrause]

I think you are seeing a placebo effect.

Even if the cool colar is capable of extracting large amounts of heat from the oil, where does that heat go? The only way heat can get out of the engine bay is back through the engine. So you end up with cooler oil, and hotter engine. I just don't get it. I thought the oil is supposed to cool the engine.

The test documentation that I saw on the cool colar were tests run on a test bench with a high speed fan, on a corvette (water cooled with the oil filter exposed to cooling air), and on a motorcycle (again, exposed to cooling air). The best that thse examples got were a 10 degree drop in oil temps. Has anybody run any kind of well run test on a 911?

If you ask somebody who just spent $40 on something if it works, of course their answer will be "yes, a little".



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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY

[JMPRO]

Bob, you should be able to cut it in half to install it and have little or no decrease in function, although I have never heard of this to be necessary to install it . Perhaps you could look at the tech artical on pelican parts for some ideas on installation
Jerry 78 911 sc

[Wayne 962]

"The only way heat can get out of the engine bay is back through the engine."

Huh? That's pretty rediculous. Anyone who has taken (or even read) anything on thermodynamics knows that the heat radiates to cooler areas. Last time I checked, the air inside my engine compartment wasn't greater than 210 degrees. Although it may feel hot when you open the decklid, the air is actually VERY COLD, when compared to the engine temperatures. Very hot, of course, when compared to optimum operating temperatures of humans, but cold to the engine.

Put it this way, if the cool collar is getting hot, it's radiating heat. If it's radiating heat, it's removing it from the engine oil.

How does that trombone cooler work? By radiating heat? As it happens, the plain metal tube doesn't have much surface area, and doesn't really act like a good radiating agent.

Also, the collar (and the cooler) would work better if it was painted black (like the boxes I used to design for Hughes Space and Comm).

I have some test data on an actual 911SC that I'll post here tomorrow (it's at the shop, and I'm at home now).

-Wayne

[Zendalar]

I am thinking of doing a bit more radical, see my car does not have any kind of heating device (for cabinet). I was thinking of adding couple Peltier elements that would heat the interior of the car and therefore the otherside of the peltier would get cool, like -20 celsius. This is the opposite that I have done with my computer cooling. Here the cooling comes as a side effect.

I am thinking couple 170 watt peltier elements to heat up the air inside the cabinet. All this needs is big heatsinks on both sides of the peltier element, and the heat/cold somehow directed to the cold/hot places.

Of course the peltiers won't cool the engine with 340 watts. There is some 60% efficiency on this, but its definitevely more efficient than collar.


Wayne , if you painted them black, the efficiency would be reduced. Usually the paint inhibits some of the radiance that comes from aluminium. If the collar would be anodized then it would work better. ALthough the effect is minimal.



[This message has been edited by Zendalar (edited 08-07-2001).]

[Clark Griswald]

Bills point is that the heat coming off the cool collar is being sucked through the fan, effectively increasing the temperature of the engine cooling air. He is correct.

This problem does not exist in those test cases on the vette and motorcycle, it is peculiar to the 911 layout. The argument says that the cool collar "robs peter to pay paul" - that is the oil temp is reduced at the expense of increase engine temperature. Since the 911 does not have an engine temerature guage, we don't know the real world effect of the cool collar on engine temperature.

This argument has merit, however I believe that the huge volume of air (about 1500 cfm) moving through the engine mitigates the effect.

The cool collar will dissipate heat energy (this is good) and it will reduce the amount of heat energy dissipated by the engine cooling fins (this is bad), but the heat energy dissipated by the CC will be greater than the reduction in heat dissipated by the engine cooling fins.

Thus we have net cooling effect.


Chuck Moreland '86 Cab - "Sparky", '77 Targa - "Sweet Pea"

[Clark Griswald]

Zendelar,

Where will you get the 340 watts power to run the peltier devices?

Let me guess that you will pull this from your alternator. How much additional heat will the engine produce while turning the alternator to create the extra 340 watts?

You will be increasing your engine temperature.