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Old 08-21-2006, 09:58 AM   #1
kaisersouse
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Default Intake ?s. Keeping the cold air cold and the hot air OUT (wrap/painting)

So I have some of that duct wrap you get for your home's forced hot-air ducts. Aluminum type stuff you wrap around ducts. I was thinking of wrapping my intake pipe in this.

That beign said..I wanted to paint my intake manifold w/ heat resistant paint (black) so I was wondering if I should just use the same paint on the intake tube.

Thoughts on this? I know I wont get +100hp, I'd just feel better knowing I did a little bit to keep the air temp down even if its 1 or 2 degrees.
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Old 08-21-2006, 10:58 AM   #2
Guerice
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I think either will make a difference, but ceramic paint would keep the intake temperature down.
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Old 08-21-2006, 03:06 PM   #3
BURTONRIDR
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I wrapped mine with like 2" duct wrap. I think it would help if you were running a 1/4 mile and stopped each time and cooled it back down. But I took mine apart one day after I drove home from work and the inside of the intake was still hot. So Im not really sure it works or not. I think the problem was that it either needed more than one layer of wrap or I need to put a heat shield between the intake tube and the engine. I dunno just somethings to consider. It is like every 10 degrees lower makes 1hp though.
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Old 08-21-2006, 04:36 PM   #4
piker28
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honestly the air is moving through the intake so fast that it wont really make a difference, might prevent more heat soak but only for so long and then prob keep the hot air in once the thing heats up
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Old 08-22-2006, 04:33 PM   #5
HondaH8er
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The air under the hood circulates out so fast that it really doesn't matter. Once you Leave a stop sign or light, even at low speeds, after about 5-10 seconds, the air under the hood is within about 3 degrees of the air in the fender. But if you are mostly interested in keeping the intake tube itself from heatsoaking, a plastic (ABS, not PVC) tube will do the job.
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Old 08-22-2006, 05:27 PM   #6
BURTONRIDR
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Although the actual air temperature under the hood may stay within the same range as the outside air temp you need to worry more about radiant heat from the engine. The best way to do that is to have a reflective surface on the outside of your intake or build a heat shield between the intake tube and the engine.

It does make much of a difference in any case.... I had an engineer calculate the heat gain of the air passing through a 3" aluminum tube that is 24" long @ 150 cfm (a 2.5l engine at 6500 rpm intakes 250 cfm). If the engine compartment is 110 degrees F and the air traveling into the intake is 96 degrees F. He calculated that nearly all the heat would penetrate the intake tube. Meaning that the intake tube is still going to be atleast 110. With all of these parameters the entering air temp would be 96 degrees F and the exiting air temp would be around 98 degrees F. Not a big difference.... this doesnt take into account however the increase in temp of the intake tube caused by radiant heat from the engine, so you could expect the intake tube to get hotter than 110 degrees. he said that even wrapping the intake tube with R-3 duct wrap wouldnt do much.

One thing I thought of after talking to him was to make a heat shield to place between the intake and the engine to help block the radiant heat......
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Old 08-22-2006, 08:18 PM   #7
HondaH8er
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Get a plastic 04 2.5RS intake manifold if you're that worried about it, otherwise it won't matter, because that thing gets hot, and not from radiant heat, but from where it's connected to the heads, the heat from them gets transfered right to the manifold. Phenolic spacers help a lot, too, but the plastic manifold would be even better.
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Old 08-23-2006, 01:34 AM   #8
bflowrx
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Default cold air

I made my own for my baja and utilized the factory plubing to help bring fresh air back into the intakehttp://<a href="http://www.flickr.co...nk">Intake</a>
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Old 08-23-2006, 02:32 AM   #9
Storm
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We wrapped our intake tube and found it made a small difference on hot days and lots of runs. Not only that, but the wrap covers up the weaponR tube while giving the industrial, full race look and added intimidation factor to the other guys..... :P

Our current manifold is sheet aluminum and silicone couplers on the runners. After runs our manifold stays positively cool to the touch while the motor is quite hot.....Our results show it's making a difference for the better.

YMMV

Jay Storm
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Old 08-23-2006, 08:43 PM   #10
wrx034me
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i made my own heatshield for the intake, i made a seperate piece to shield the tube itself from the radiant heat i hope this pic doesnt turn out too small to see it

heatshield for filter area (2 sheets of .060 alum with a sheet of thermotec sandwiched in) heatshield for tube itself is .032 SS with that alum coated thermotec self adhesive, also have the turbo wrapped

after a long drive i can now pull over and hold my hand on the tube and not get burnt
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Old 08-26-2006, 11:49 AM   #11
Davenow
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Quote:
Originally Posted by kaisersouse

I know I wont get +1hp, .
Honestly, thats closer to the truth on the NA subbys (which bums me out, because I may be buying one for my wife this weekend or soon after)
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