(ask) Dry Ice for cooling air intake temperature

[ordengineering]

Guys, i know that we could reduce air temperatur by placing the dry ice in the intake manifold.

But I've seen some peeps using dry ice vapor to cooling their intake air temperature.

So the dry ice vapor was sucked into the intake manifold just like carburizing system.

My question is,

1. Dry ice is containing lot of CO2, would it more hurting performance than the benefit that we got from reducing intake air temperature??

2. And how about the sudden impact about the rapid drop temperature inside the combustion chamber, im affraid when the engine works inside their operating temperature then suddenly its drop rapidly by the extreme cold of the dry ice vapor, the internal engine parts would crack.

Any information about "how to" on this system? i mean about the dry ice vapor that goes inside the combustion chamber.

I plan to use it on my drag race Honda N/A motor, that run 15.5:1 compresion ratio.



I know my english was weird, but i believe you guys know my point


Thanks for the share

Regards



Odie Rachmat

 

[PedroCG]

If you reduce the speed you reduce the heat transfer coefficient (smaller reynolds number), you also reduce losses but by reducing the hidraulie diameter you increase them.
We are just looking at the air side, the other one is as important, if the heat transfer coefficient isn't big enough the wall temperature will be higher...
I also thing this kind of system is just a waste of space/money/time in a N/A engine, in a forced induction aplication (big temperature difference between air and tube walls) the system could have some advantages.