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post #1 of 12 (permalink) Old 03-21-2011, 12:31 PM Thread Starter
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A2W Intercooler

I'm building a F/I system and will be using an A2W intercooler setup. I'm trying to figure out if I will need to pressurize the system water side of the system, which will determine the type of fill cap I use.

Pressurized with a radiator cap:


or not and use this:




Do I determine that based on the type of pump I'm using ( impellar vs. Diaphram)?

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post #2 of 12 (permalink) Old 03-21-2011, 12:33 PM
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imho

impeller, and ~1atm of pressure like a rad cap is set to

-Jason
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post #3 of 12 (permalink) Old 03-21-2011, 12:39 PM Thread Starter
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well i already have an impeller type pump.

I am assuming because it does not generate its own pressure that is why I would need to use a system with a pressure cap on my reservoir, correct?

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post #4 of 12 (permalink) Old 03-21-2011, 12:43 PM
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the pump will generate pressure on its exhaust side, thermal expansion of the water in an enclosed system will also create pressure
but thats not why all, the added pressure prevents the water from boiling at 212(assuming it is water only) boiling is bad as heat is not nearly as easily exhanged through steam as it is thru liquid water

i say impeller because a diaphragm pump pumps in pulses rather than a continuous flow and the rotory motion is readily available on an engine

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post #5 of 12 (permalink) Old 03-21-2011, 12:48 PM Thread Starter
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I know that pressure increases the boiling point buy I cant imagine the water would ever get that hot unless the pump fails.

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post #6 of 12 (permalink) Old 03-21-2011, 12:54 PM
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ever seen a dirtbike boil over? including the little 125s adn 250s?

what engine is it going on?

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post #7 of 12 (permalink) Old 03-21-2011, 12:58 PM Thread Starter
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ive seen my truck radiator boil over but this is for the intercooler, not the engine.

Its going on an rx8. It would have to be a hot day for the intake charge to ever enough over 212 for a period of time that enough heat could be transferred out to get nearly that hot. My radiator is enormous and the total system capacity is probably 1.5 gallon

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post #8 of 12 (permalink) Old 03-21-2011, 01:04 PM
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i missed the part about it only being the intercooler
a turbo can produce a great deal of heat though

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post #9 of 12 (permalink) Old 03-21-2011, 02:24 PM Thread Starter
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yea, i think I'm looking at 275 - 300*F pre-intercooler assuming 20psi, 100*F ambient.

Street driving that should be no big deal.. I'm trying to figure out just how much it will tax the system at, say, Road America for half hour sessions.

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post #10 of 12 (permalink) Old 03-21-2011, 10:45 PM
 
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Why would you go with a water to air on a car that is going to see track time? If you're constantly on boost, the water will heat up and as it does its efficiency will drop. Most A2W inter coolers are only meant to cool for short (5 to 10 seconds) bursts before being allowed to cool for a longer period of time (45 to 90 seconds). I can't think of any modern F/I system that uses A/W, although I have seen of supercharged miatas with them due to simplicity of design.

Air to air is far more efficient unless you are worried about heat soaking in traffic. Is there a space restriction in the RX8? I swear I've seen FMICs on them. If space is the concern, I would go with a water or methanol injection rather than a A2W intercooler.

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post #11 of 12 (permalink) Old 03-21-2011, 10:46 PM Thread Starter
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the engine cooling system is horrifically bad and a FMIC is a HORRIBLE idea on that car.

more later.

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post #12 of 12 (permalink) Old 03-21-2011, 11:01 PM Thread Starter
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just because it sees track time doesn't mean its a track car and wont be a daily driver or in traffic.

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