Exit109GTI

So can anyone give me a scientific explanation of why N2O might be colder than CO2 when changed from a Liquid into a Gas? I'm looking for an actual scientific explation, maybe a good place to start would be the ideal gas law. This is in refference to using CO2 to spray onto an intercooler rather than the more expensive N2O.

acuraman32cl

i cant find the enthalpy change for the transfer from liquid to gas, but if N20 has a higher change, it will absord more heat in the process. so it is related to the enthalpy change in the change in state. if you dont know what enthalpy is, iam not gonna explain it, take high school chemistry. i think this is the reason.

RandyMax

wait, isn't N2O combustable?? why would you spray combustable gas into your engine compartment??

SiGGy

HUH?

N20 an oxidizer...

You still need a fuel....

BoostedM3

Liquid CO2 is only possible at very high pressures due to its low sublimation energy (solid to gas). Even then, it's a mixture of gaseous and liquid CO2 as it heats up. Find a chemistry book and compare the heat of sublimation for CO2 and heat of vaporization of N2O. Also, you need to know what temperature both reside at. Solid CO2 is -78C, im not sure about N2O.

AK_MOBBER

I think he was referring to those setups that spray cold N2O but usually CO2 into the front of the intercooler. This dramatically reduces temps entering the engine after boost.

LegendC

The key difference in what he is trying to do is "spray ONTO the intercooler" as opposed to "spray INTO the intercooler"

The horsepower benefits of N2O is from the extra oxygen it supplies to the combustion process. The cooling effect is only secondary.

Exit109GTI

I don't agree, normal air is almost exactly made from two parts nitrogen one part oxygen, it's the cooling and thus increase in density on the intake charge that produces the horsepower. Spraying a gas with a low boiling point onto the IC will reduce the intake charge temp in the same way, just not provide nearly as much HP, but you can do it all day without your engine blowing up!

RandyMax

Oh, duh... :o

RUF87

I this the stuff your thinking of using?

http://www.designengineering.com/index.html

Ruf

LegendC

http://www.mistupid.com/chemistry/aircomp.htm

Air is 20% O and 79% N

N20 is 33% O and 66% N

There is 150% more oxygen available when you spray. Combine this with more fuel and you get more power. The tempature is a secondary effect and mostly prevents detonation rather than adding power.

SiGGy

Propane injection is interesting if any folks haven't read about it...

(it essentially rasies the octane of the fuel)

dulux

A reduced temperature is Extremely helpful in producing more hp, not just for preventing detonation. There have been tests in turbo compact (mag) that measured hp change by lowering the engine temp by 30 degrees and found an increase of about 15% in hp.

CLpower

so is that water injection where they use windshield washer fluid

cor

either i'm retarded or you guys are missing the common sense of n2o

SiGGy

nope common sense about N20 says


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Exit109GTI

I believe this is based on mass and not chemical makeup.