94mm turbo on a stang :D

madsupra88

madsupra88

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Sep 17, 2005
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Turbo. Targa. Life. said:
Worst...analogy...EVAR.

When you lick your finger, the air isn't cooler that's hitting your finger, it's cooling the spit ON your finger. When your finger is dry, you have your body temp (around 97*) going up against the wind. When you lick your finger, you have spit, which has undoubtedly cooled down at least 20* by the time you raise your finger, being cooled by the wind. It's as simple as--hold an ice cube to your finger, it melts. Wet your finger, then hold an ice cube to it--it sticks. It's becuse the water on your finger cools and bonds with your skin.

Someone correct me if I'm way off base here :D
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Okaayy let me explain a little better.

I reasearched this and found this on a forum..

water-to-air intercoolers use two heat exchangers.. one located in the intake track (this one removes heat from the intake air) and the other typically near the front of the car where it recieves cool moving air.. the water used in the intercooler is not from the main engine coolant however it comes from a seperate resevoir just for intercooling.. if the water did come from the engine, which is much hotter than the intake charge would ever get, then it would be an interheater... the advantages of a water-to-air are: 1) water has a much higher heat-transfer coefficient than air it is about 14 to 1 so the ability of the water to carry heat away is much better 2) the lines required for water to be routed to the front of the car can go any route one would please.. pressure drop doesnt matter here.. however it does require a seperate pump.. in cars with less space or funky intake layouts water intercooling is the way to go... with the ability of water to transfer heat better it is possible for water-to-air intercooler to achieve better than 100% efficiency in that the air can be cooled beyond what it was orginally before it was compressed, however this requires the use of ice or some other coolant.. (in turbocharged boats water-to-air is perfect with an abundant source of cool water) .. Drag cars are also ideal especially when ice, or other coolants (perhaps Liquid Nitrogen!) are used.. however ice and liquid nitrogen are consumables, meaning they only last so long and need to be refueled.. could get pricey and a pain in the ass.. many cars have been manufactured from the factory with water-to-air intercoolers(Lotus, Maserati, 198x's Mazda RX-7s Turbos.. ) and they work great for their applications..

Basically, air to air IC is better for street, and air/water IC is more for drag racing
 
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souprat

New Member
Mar 30, 2005
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fairfax VA
Turbo. Targa. Life. said:
Worst...analogy...EVAR.

When you lick your finger, the air isn't cooler that's hitting your finger, it's cooling the spit ON your finger. When your finger is dry, you have your body temp (around 97*) going up against the wind. When you lick your finger, you have spit, which has undoubtedly cooled down at least 20* by the time you raise your finger, being cooled by the wind. It's as simple as--hold an ice cube to your finger, it melts. Wet your finger, then hold an ice cube to it--it sticks. It's becuse the water on your finger cools and bonds with your skin.

Someone correct me if I'm way off base here :D
Click to expand...


i'll be the one to correct you! wind does not, and cannot cool things by simply flowing, if anything it heats things up(fricton). wind is just air, therefore the wind is at the same temp as the air and by just blowing on your wet finger you are not cooling your finger down by the flowing of air over you finger, but by the evaporaion of the spit off your finger.

Wikipidia said:
The thermal motion of a molecule of liquid must be sufficient to overcome the surface tension and evaporate, that is, its kinetic energy must exceed the work function of cohesion at the surface. Evaporation therefore, proceeds more quickly at higher temperature, at higher flow rates between the gaseous and liquid phase and in liquids with lower surface tension (i.e. higher vapor pressure). Since only a small proportion of the molecules are located near the surface and are moving in the proper direction to escape at any given instant, the rate of evaporation is limited. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. This phenomenon is also called evaporative cooling. This is the reason that evaporating sweat cools the human body.
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Maximum Boost by Corky Bell said:
The air/air unit will generally have greater simplicity, greater thermal efficiency at high speeds, greater reliabilaty, lower maintenance, and lower cost. The air/water unit will generally have better thermal efficiency at low speeds, better throtle responce when a mass-flowmeter-equiped EFI system is present, lower boost pressure loss, and less compresor surge.
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Maximum Boost by Corky Bell said:
Although complex, the water based ic enjoys the one teriffic advantage of the far greater (forteenfold) heat transfer coefficient between water and aluminum than air and aluminum.
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air to water ic's are the shit. they can be made small because of the cooling abilatys of water, low pressure drops, and high efficency. and if yoi still dont believe me, then yo might consider that IJ is running a PWR air to water ic. circulating the water with a electric pump to a pair of oil coolers i believe.
 
madsupra88

madsupra88

BoOoOoST
Sep 17, 2005
1,245
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Detroit,MI
souprat said:
i'll be the one to correct you! wind does not, and cannot cool things by simply flowing, if anything it heats things up(fricton). wind is just air, therefore the wind is at the same temp as the air and by just blowing on your wet finger you are not cooling your finger down by the flowing of air over you finger, but by the evaporaion of the spit off your finger.







air to water ic's are the shit. they can be made small because of the cooling abilatys of water, low pressure drops, and high efficency. and if yoi still dont believe me, then yo might consider that IJ is running a PWR air to water ic. circulating the water with a electric pump to a pair of oil coolers i believe.
Click to expand...


And i thank you for the back up :)
 
S

souprat

New Member
Mar 30, 2005
649
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fairfax VA
no problem.

and just alittle correction to my other post. IJ was running a PWR air/water, but switched to an air/air for flow reasons. but that doesnt change anything, air/water still kicks ass.
 
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