Polishing the UIM bad for heat dissipation?
#51
Yea you did...they're prob being shady yet accurate by claiming a "spaceage" material, ie plastic It's right up there w/ itemization
As for the TB that Garfinkle polished, yea that bad boy is on my car. But I took off the FIC and bypassed the coolant flowing thru the TB. I never polished my UIM tho. It was on the list, but toward the bottom.
BTW, did I ever give you my old TB and pay you for Garfinkle's polishing??
As for the TB that Garfinkle polished, yea that bad boy is on my car. But I took off the FIC and bypassed the coolant flowing thru the TB. I never polished my UIM tho. It was on the list, but toward the bottom.
BTW, did I ever give you my old TB and pay you for Garfinkle's polishing??
#54
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Originally Posted by herblenny
I just looked at that gasket.. Man.. AWESOME stuff!!! UPTO 5% HP!!! so, if I'm making 300+ I might get 15 horsepower by going with the gasket.. Come on!! What is this "spaceage" material??? Plastic at one point was consider "spaceage material".. And supposed to give "much cooler intake/denser intake charge". It might be cooler, but not sure about "much" cooler.. and also I don't know about noticable HP gain..
"laminated phenolic composite with a thermal conductivity of 0.29 W/m*K. Aluminum on the other hand has a thermal conductivity of 150 W/m*K"
"can withstand temperatures up to nearly 300°F, and has a thermal expansion coefficient very similar to aluminum to increase sealing capabilities"
im not sure about how the would stand up to the heat where they located on are cars i have a infared thermomater but my car is torn apart right know so i cant get temps of the LIM,UIM maybe next week
Last edited by krackerx7; 04-07-05 at 09:55 PM.
#55
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Originally Posted by jimlab
Ramy, why do I get the feeling that you're going to reach 10,000 posts and still not really know anything substantial about your car?
#56
Q=h*A*dT
That's what they keep grinding into our heads here at school. heat transfer is Q, h is the heat transfer coefficient (can be found in a thermodynamics book), A is the area and dT is the difference in temperature between the two things.. in your case air and aluminum. How much difference does it make? I'll let you know after I finish all my 412 reports.. the NAMD I have to do for senior design and the presentations I need to put together.
Can't wait for summer.
That's what they keep grinding into our heads here at school. heat transfer is Q, h is the heat transfer coefficient (can be found in a thermodynamics book), A is the area and dT is the difference in temperature between the two things.. in your case air and aluminum. How much difference does it make? I'll let you know after I finish all my 412 reports.. the NAMD I have to do for senior design and the presentations I need to put together.
Can't wait for summer.
#57
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After taking physics in Engineering for a while, here is what I think:
There is a concept as they call Black body radiation, meaning that any object that is warmed up begins to lose energy through radiation; the wave length and intensity of the radiation depends on the type of material. The point is that the UIM does not generate heat but itself from inside since its hooked up to IC, but it gets attacked by the heat radiation of all the other components under the hood. A polished UIM is capable of reflecting a BIG portion of radiation Vs. the stock that would absorb instead.
And regarding the surface area, yes it’s negligible.
I'm getting it Polished, end of story.....
-ray
There is a concept as they call Black body radiation, meaning that any object that is warmed up begins to lose energy through radiation; the wave length and intensity of the radiation depends on the type of material. The point is that the UIM does not generate heat but itself from inside since its hooked up to IC, but it gets attacked by the heat radiation of all the other components under the hood. A polished UIM is capable of reflecting a BIG portion of radiation Vs. the stock that would absorb instead.
And regarding the surface area, yes it’s negligible.
I'm getting it Polished, end of story.....
-ray
#58
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Originally Posted by FDNewbie
I'm reviving Tyler's comment from another thread (https://www.rx7club.com/3rd-generation-specific-1993-2002-16/need-some-ideas-engine-bay-dress-up-202358/) because yesterday I was talking w/ an FD old timer (used to mess around w/ FDs back in the old days...like 1998, time of the PFS Gold Computer..etc... and he saw how I had everything polished minus the UIM, and told me "Smart thing for you not to polish the UIM." When I asked him why (because I actually planned on doing it) he said "See all the little bumps on it, how the surface is so coarse? That peice is cast iron and left like that to increase surface area, allowing for greater heat dissipation. When you polish the UIM, you get rid of all the grainy surface bumps, smoothing it out, effectively decreasing your surface area for heat dissipation. What you want to do is powedercoat it a thin light coat, maybe even a chrome powdercoat, then they can put a a thin color latex on it, so it still has the chrome appearance, but in a different color, plus the latex paint will protect the chrome from oxidizing. That way it's still bling while maintaining the increased surface area for heat dissipation."
Anyone have any comments on this?
Anyone have any comments on this?
Originally Posted by FDNewbie
he said "See all the little bumps on it, how the surface is so coarse? That peice is cast iron and left like that to increase surface area, allowing for greater heat dissipation.
I've had a Jet hot coated UIM for sale for 6 months and have finally traded it for a stock on so I can have it polished. Aluminum transferrs heat really well (used in most all electronic's just for that pourpose, and the only way to really improve or make the UIM more efective would be to add fins and provide some source of air movement over it, other wise polished or stock (miniscule issue).
Someone who takes the time to keep the engine bay clean and prove the air flow for lower under the hood temperatures
#59
Respecognize!
really, for what its worth and after a megaton of calculations. there would be more "performace" if you want to call it that from duck taping a damn ice cube to the UIM than there would be from leaving it "as cast".
#60
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If anyone want's there stuff polished contact me ! ! ! ! ! LOL you'll notice the heat blanket on the turbo's in the last picture that made one hell of a difference in under hood temps and turbo area.
#62
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Originally Posted by FDNewbie
Man...talk about an old thread! This is from last February! haha.
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