DarrenW
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| posted on 1/6/06 at 01:22 PM |
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What is a charge cooler?
Am i right in guessing that it is just a radiator that the carb inlet air goes through instead of water so the air gets cooled more than std?
Is there any benefit in having one of these in a n/a engine? ie air thro charge cooler before entering a carb air box?????
Im just interested in the theory having never enjoyed playing about with turbo / supercharger systems.
Whats the difference between a charge cooler and an intercooler?
If there is a benefit, what would be a suitable donor cooler for a 2.0 se7en type vehicle running bike carbs? Obviously locost!!
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andyharding
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| posted on 1/6/06 at 01:26 PM |
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A charge cooler can either be like a radiator where the intake charge is cooled by airflow or a heat exchanger where the intake charge is cooled by
the engine coolant. I think the former is often called an intercooler but not 100%.
Are you a Mac user or a retard?
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andyharding
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| posted on 1/6/06 at 01:27 PM |
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No point adding one to a NA car as the only reason it's needed on a charged car is that the compression and or turbo heat up the charge. On NA
the intake charge is at ambient temp andyway so a charge cooler couldn't cool it any more anyway. Plus it would restrict the intake.
Are you a Mac user or a retard?
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DarrenW
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| posted on 1/6/06 at 01:39 PM |
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Ah i see now.
So the purpose of an intercooler or charge cooler on forced induction system is merely to get the intake temps back down to something like that of a
n/a system? i thought for some reason they may be to cool it even further to get some further advantage.
I get your point ref restricting airflow, i kind of already guessed that but wanted to keep initial post short rather than my usual war and piece.
So taking the theory further, NOS must be used then to further cool the intake charge below ambient to get a denser content. i guess thers no other
practical way to 'supercool' the charge.
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scottc
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| posted on 1/6/06 at 01:47 PM |
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I believe water injection is what you're getting at.
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DarrenW
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| posted on 1/6/06 at 01:56 PM |
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wooohoo - another topic. Ive heard of that - please explain further.
I know of a lad with a rally cross car n/a that had a washer jet directed (i assume) at something on the intake system to (presumably) try and cool it
further.
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scottc
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| posted on 1/6/06 at 01:58 PM |
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I believe it sprays water across the charge to cool it. not 100% though
edit:
http://www.rallycars.com/Cars/WaterInjection.html
[Edited on 1/6/06 by scottc]
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C10CoryM
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| posted on 1/6/06 at 02:07 PM |
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Water injection sprays into the cylinder like a fuel injector to cool and keep from melting pistons etc. You will find it on some drag cars and some
hill climb cars. Hill climb cars need it because of the elevation change. It can also add power if done right by the expanding steam.
NOS is to add more O2 into the system. It will help cool as well, but thats just secondary. The power gain comes from all the extra o2/fuel.
Some intercoolers are in an icebox to cool the charge down as much as possible. Know a guy with a 6sec mustang and his intercooler is about
2x2x2' and full of ice. He has his own ice machine in the shop  .
The transam I play with runs 15psi of boost and has 2 smaller air/air intercoolers that are 120% efficient. They actually cool the charge down below
the air temp entering the supercharger.
"Our watchword evermore shall be: The Maple Leaf Forever!"
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Marcus
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| posted on 1/6/06 at 02:07 PM |
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As far as I remember (not very!)
Water injection is primarily used to prevent pre ignition on high compression engines by increasing the air / fuel density. Hence its use in
turbocharged engines with higher comp ratios. The fact that it also cools the mix is an added benefit.
Marcus
Marcus
Because kits are for girls!!
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irvined
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| posted on 1/6/06 at 02:55 PM |
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Yep,
Had a 1340 turbo'd mini, used water injection to stop the pre-ignition and stop it melting postons
http://irvined.blogspot.com
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SeaBass
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| posted on 1/6/06 at 03:18 PM |
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http://www.vf-engineering.com/index.php?v=/information/info_aftercooling.php
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andyharding
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| posted on 1/6/06 at 03:43 PM |
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Water injection cools the charge so in high boost applications help prevent detonation.
I've also seen a rig that sprayed water over the intercooler to keep the outside wet which results in it chilling below ambient.
Are you a Mac user or a retard?
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scottc
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| posted on 1/6/06 at 03:44 PM |
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Cheers guys (for setting me straight)
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MikeRJ
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| posted on 1/6/06 at 04:39 PM |
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quote:
Originally posted by Marcus
As far as I remember (not very!)
Water injection is primarily used to prevent pre ignition on high compression engines by increasing the air / fuel density. Hence its use in
turbocharged engines with higher comp ratios. The fact that it also cools the mix is an added benefit.
Marcus
Any improvement in charge density can only come about due to cooling. Also bare in mind that the water displaces some charge itself.
It's primary purpose is to reduce charge and peak combustion temperatures.
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tks
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| posted on 1/6/06 at 04:53 PM |
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need less to say
that the water charge in the piston cooling useage is injected after the work stroke..
in fact the hot gasses are escaping the cilinder and then the water is injected to cool down the piston..
offcourse the amount of it is a map ansi
Tks
The above comments are always meant to be from the above persons perspective.
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bimbleuk
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| posted on 1/6/06 at 07:04 PM |
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Water is injected primarily to resist knock by cooling/slowing the combustion process and absorbing heat as it turns to steam. Can be cheaper than
using high octane fuel but this can be off set by the cost of a decent injection system.
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