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Author
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Topic: Dry Ice intake??
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H8CHEVY
Gearhead Posts: 107
From: Southern Cali
Registered: Jun 2000
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posted 08-18-2001 05:21 PM
   
Has anyone ever tried to build a dry ice intake?? I was told by an older gentlemen at the track this weekend if you build a box aircleaner, and some how put dry ice in it, you can improve your 1/4mi runs by a few tenths of a second... is this true? any input??
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jkilroy
Gearhead Posts: 1206
From: Austin, TX
Registered: Dec 99
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posted 08-18-2001 06:52 PM
That is an interesting idea. However there are some things to consider. Dry ice does not melt, it converts directly into a gas, which I believe is carbon dioxide. This gas would have to replace some of the usual air in the combustion process, and while it would be cold, it doesn't burn. However, the slightly rich condition might go well with the colder air.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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bluetech
Journeyman Posts: 61
From: Far and Away
Registered: Feb 2001
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posted 08-19-2001 03:40 AM
I was also thinking about that for some time now. Haven't tried it yet because my engine is not yet finished. But I am optimistic that it will help cool the mixture w/c will improve performance.
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68F100
Gearhead Posts: 957
From: Fort Madison, Iowa
Registered: Oct 99
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posted 08-19-2001 04:00 AM
I would think that the CO2 given off by the dry ice would be detrimental. If you are sucking in all that CO2, it would not be taking in as much pure oxygen, right? Or am I just guessing here? Or will an engine be able to "breathe" the O2 from the CO2, unlike humans, who breathe in O2 and exhale CO2? And if an engine can breath CO2, you could just rig up a bunch of those CO2 cartridges for airguns like nitrous. Ok, now I'm just being silly.
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DutchD58
Journeyman Posts: 79
From: West Milton, OH
Registered: Jul 2000
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posted 08-19-2001 08:51 AM
Maybe if the airbox was double walled with the dry ice inside the cavity so it could cool the inner walls without being in direct contact with the incoming air? Pop a few holes in the outer walls so the dissipating CO2 had someplace to go. Sorta along the same principle as a fuel line "Kool Kan". Just my $.02. Kevin
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SteveLaRiviere
Administrator Posts: 15706
From: Saco, Maine MCA # 47773
Registered: May 99
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posted 08-19-2001 09:30 AM
I doubt he's talking about injesting it. I think he's talking about the cool can principle.------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!
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H8CHEVY
Gearhead Posts: 107
From: Southern Cali
Registered: Jun 2000
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posted 08-19-2001 03:12 PM
so I take it that the easy route would be just to put a kool kan on my fuel line and call it a wrap...
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Ryan Wilke
Gearhead Posts: 387
From: Stanton, MI
Registered: Oct 2000
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posted 08-21-2001 08:03 PM
H8:
Dry ice is the solid form of Carbon Dioxide (CO2). CO2 will NOT burn. Class B fire extinguishers are filled with CO2 and are used to put oil & grease fires OUT! (at -108F, it will also cool a 6-pak down quick)! I agree, by using a insulated carb gasket/spacer, a heat exchanger (kool-can) designed with a coil to circulate fuel thru an ice-filled water bath and then insulate the fuel delivery line to the carb will do wonders to cool the incoming air/fuel charge. It also makes jet changing easier since the carb is always nice and cool! Lastly, use a fully-functionable air scoop - sealed to the hood, preventing engine compartment air from mixing in with the cool outside air. The kool-can and the fresh air scoop will give you your best bang for your buck! If you make sure that you always have ice water in your kool-can, your fuel temp will be consistant, then only variable will be the quality of the incoming air (temperature, humidity & barametric pressure). Good Luck! Ryan  ------------------
The '3-Pedal Attitude' Kid
in a '69 FB w/ 306 now, but
the 460+ is coming... :D
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H8CHEVY
Gearhead Posts: 107
From: Southern Cali
Registered: Jun 2000
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posted 08-22-2001 04:54 PM
Ryan, hey thanks for the info.. I was told that the dry ice would chill the incoming air... just a thought.. thanks for the imput.. gonna try that kool kan idea. now only if I can find a can around here....
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