Toymods Car Club Inc: Tech & Conversions => Intercooler on NA

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beena
Occasional Poster

Location:
Melbourne
Registered:
June 2002

Re: Intercooler on NA	Sun, 23 June 2002 15:28

I would follow mrshin's lead... Everyone is very correct saying that a strictly air-to-air cooler cannot cool below ambient. However, if a water spray is used this is quite possible! Through exactly the same mechanism's that cause you to feel cooler on a hot day if you spray water on yourself. This is evaporation. An extension of the water spray idea would be to use a different spray eg Metho. If you've ever put metho on your hand you will notice it evaporates quickly and feels cold - same idea as the water - just works a little better! Or use either with a solid like dry ice or a gas (during dyno runs some people spray nitrous on their intercoolers - although any rapidly expanding gas would work well). Even the idea of a refrigerated system has been toyed with, again there is an article on AutoSpeed somewhere. Norbie's theory, although with good basis, has a fatal flaw (sorry Norbie! ) The problem is where the inlet charge is said to be at 15psi. This means it has positive pressure hence 'forced induction'!!! This car would have to be turbo... The 'boost' on a turbo car is the pressure in the inlet manifold. 15psi is 15psi ABOVE AMBIENT. In a NA car there is actually a vacuum in the inlet manifold causing more air to be 'sucked' in, in a charged car (turbo or super) there is something 'pushing' it in. Some companies have tried to overcome this vacuum through using what is called a "Ram Air' Effect. Essentially this puts an intake at the front of the car (or on the bonnet) which, when the car is at speed, 'forces' the air in at some positive pressure. Usually only enough to bring manifold pressure to zero or slightly positive instead of negative (vacuum). As for frost on the piping? I find it hard to believe. (not doubting you guys saw it, just how it got there...) This would mean that the temp of the air in the pipe was at or below 0! (or was expanding rapidly enough to cool the pipe to zero!) Not really possible as i'm sure you'd agree! I'm just trying to help people understand the basic principles behind all this so they can form their own theories and not be sucked in by marketing and gimicks! And hopefully they can pass the information on so we all know a little more... [Report message to a moderator]

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