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thomasotten |
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#1
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,550 Joined: 16-November 03 From: San Antonio, Texas Member No.: 1,349 ![]() |
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. |
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lapuwali |
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#2
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Not another one! ![]() ![]() ![]() ![]() Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 ![]() ![]() |
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. |
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