Cool Collar, 12% reduction in oil temperature Options

[thomasotten]

What do you think? Gimmick? I find the 12% figure a little hard to believe. Maybe they were just measuring inlet/outlet temperature of the filter, not OVERALL oil temperature.

(IMG:http://content.madirect.com/img300/fr2423.jpg)

From the Tweeks website:

Tests have revealed a 12% reduction in oil temperature thanks to the Cool Collar, a finned aluminum cooler that increases the surface area by four times, allowing it to radiate heat faster and more efficiently. Unit fits all air and water-cooled Porsche oil filters with a simple slip-on, clamp down installation.

[Elliot_Cannon]

Hi,
I've met the guy who invented this device. He has a few other things on the market that work pretty well. I used one of these things on my 911 and I think the 12% figure is a bit optomistic. I would guess maybe a couple of degrees at most. It may be worth it though when used in conjuction with other cooling equipment.
Cheers, Elliot

[Andyrew]

Maybe 12% at the oil filter....

[tat2dphreak]

12%?! he dreaming... 1-2% I think is what he should mean... a couple degrees at the filter sounds reasonable... dunno if it is worth it

[URY914]

My BS meter is going off.

Paul

[lapuwali]

Just thinking theoretically, I might believe the 12% number IF the case of the filter were also aluminum AND some sort of thermally conducting grease were used between the filter casing and the heat sink. The oil doesn't go through the filter all that fast, so there may be enough time to lose heat to the filter case and heat sink to make a substantial difference.

If the filter case were steel, forget it. You'd never get enough heat transfer. I think many, if not most, oil filters use steel cases, so the chances this would work don't look good. I'm not a metallurgist or a thermodynamics expert, however.

The basic idea has some merit. With a finned Al filter case, esp. if there were fins INSIDE as well as outside, could provide a healthy amount of cooling.

For quite a few years, and perhaps still, a number of high-performance bikes had an oil cooler than was built into the spin-on filter mount, which circulated engine coolant around the oil passages. This appeared to work well enough to justify its inclusion on a good number of bikes. Not a lot of surface area there for heat transfer, and the coolant would have been at 180-190dF itself.

[thomasotten]

To get 12%, the most likely blew a fan over the oil filter to get forced convection going, rather than convection due to normal turbulance.

[Joe Bob]

The tail dragger board was all over this a year or two ago....snake oil at best.

[tod914]

Hmmm. I have something like for my cookingware for backpacking. Only difference, it's designed to keep the heat in (IMG:style_emoticons/default/biggrin.gif)

[ruddyboys]

It looks at least 12% cooler then the stock filter. (IMG:style_emoticons/default/jester.gif)

[URY914]

Looks count.

Just ask the Ricers.

Paul

[airsix]

I think I get it. He probably measured the temp on both sides of a regular filter. Let's say (for example only - these are not real figures!) the temps were 215 going in and 212 coming out. A 3 degree change. He then measured the temp on both sides again with the heat sink in place. Let's say it was 215 going in and 211.64 coming out. The temp differential of 3 degrees increased by 12% or 0.34 degrees. There you have it a "12% increase in cooling".

Now this is purely speculation and I could be wrong. But I could be right.

-Ben M.

[dmenche914]

12% cooler oil temp??? As a degreed engineer, BULLSHIT!

dave

[bondo]

I think I get it. He probably measured the temp on both sides of a regular filter. Let's say (for example only - these are not real figures!) the temps were 215 going in and 212 coming out. A 3 degree change. He then measured the temp on both sides again with the heat sink in place. Let's say it was 215 going in and 211.64 coming out. The temp differential of 3 degrees increased by 12% or 0.34 degrees. There you have it a "12% increase in cooling".

Now this is purely speculation and I could be wrong. But I could be right.

-Ben M.

I think that's a likely 12% scenario.. I'm curious, would that percent be different if the temps were converted to celcius? Or kelvin? Seems like you could make up a temperature scale to get any percentage you wanted, as long as there was SOME change.

[bondo]

Ooop, nevermind I get it.. You couldn't play that trick if you look at in/out temp differential.... but if you only look at the output temps, percentages could vary based on the units... that would be very bad science (IMG:style_emoticons/default/smile.gif)

[gregrobbins]

Just came across this item and always interested in cooler oil. So did a little searching: Here is what the maker is saying on their web site.

link

Air Cooled Engine (Road Test)

The test vehicle used was a 1978, 911SC Porsche, equipped with a carrera style oil cooler. The car was driven 65 MPH on an 85 degree day for approximately 35 miles. The car was then stopped and an I.R. thermometer was used to check the temperatures at various points along the oil lines, tank and cooler. Also, the reading on the dash oil temperature gauge was noted. An average temperature of 220 degrees was logged.

A Cool Collar Oil Cooler was then installed on the oil filter, and testing resumed over the same course and speed. At the end of the 35 miles, the car was stopped and all the same measurements were repeated. The temperature readings showed an average of 208 degrees, a reduction of 12 degrees.

Summary: Our calculations show a 9% temperature drop above ambient.

AND

Test Results: Laboratory Test

Castrol GTX 10W30 motor oil was heated to a temperature of 220ºF, and pumped simultaneously through two identical oil filters. One oil filter had a Cool Collar attached, the other filter did not. A fan was used to direct seventy degree F. ambient air over both oil filters at a velocity of fifty miles per hour. The oil exiting the filter having the Cool Collar installed indicated a "heat removal" of two degrees per minute. Whereas the oil temperature exiting the filter without the Cool Collar showed no change. (Typically and automotive engine passes all the oil through the filter more than once per minute).

Summary: With a constant heat source applied to the oil, the temperature dropped to 202ºF. (from 220ºF.) within five minutes. This translates to a 12% temperature decrease of the heat added to ambient temperature.

OK experts, is this real or snake oil. Cost is about $25 and even a few degrees lower oil temp is worth the investment in my mind.

They are playing with the math. 12 degrees is only 5.45% of 220. Still, lower temps are better.

[phantom914]

QUOTE (gregrobbins @ Oct 8 2005, 02:43 PM)

............ Summary: With a constant heat source applied to the oil, the temperature dropped to 202ºF. (from 220ºF.) within five minutes. This translates to a 12% temperature decrease of the heat added to ambient temperature. .......................... They are playing with the math. 12 degrees is only 5.45% of 220. Still, lower temps are better.

They are trying to say that without the collar, the oil is 150 degrees above ambient(220-70) and with the collar, the oil is 132 degrees above ambient (202-70) or 18 degrees less. 18 degrees is 12% of 150.


The lab test is not too real world in the sense that you will not have 50mph, 70degree air blowing across your filter. Also, the rate that their test setup put heat into the oil may not be the same as the rate that your engine puts heat into the oil. Actually, I would bet on it.



They don't seem to understand the difference between heat and temperature either.


Andrew

[davep]

50 MPH is 4400 Feet per minute. That is an extremely high speed for a fan to deliver, a few hundred feet per minute is good. You would get neither the velocity nor that ambient temperature air in a normal 911 engine compartment. Besides, the direction of the air over the fins is critical. Just not going to happen.

[bd1308]

not only that, but the oil filter isnt even in a direct air stream...if anything its getting air from the engine fan.....


not gonna happen......

b

[914GT]

I think the oil filter cooler works best in conjunction with the magnetic fuel cell. (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif)