DQ for "icing"?

[james schaechter]

Thanks for revisiting that. I ws told "dry ice" was not legal, but your clarification would lead me to believe otherwise. I will check into it with NHRA. I remember that some guys were really frosting intakes for awhile with the aerosol cans. Worked good too. Thanks. Good discussion for an otherwise boring day. I wish we were ready to race, but then I remember all of the work I need to be doing to the car! Better get back to work on it.

[Freddie]

Dry Ice, Aerosol cans of air, N2O, Any form of cooling your engine/trans, artifitially with any sort of chemical is not only unstable, but deemed illegal by NHRA. I always thought the main reason was the residual gasses left in the engine bay, these gasses would get sucked up in the first couple hundred feet of a run where all the ET is made up. Cold rags, Conventional ice, or a fan, all leave no chemical residue.

I know I used to use a bottle of N2o to cool my converter when we ran comp many years ago.

[Bob]

The rule, as found in the revisions and in the rule book, states that ice is legal. It does not state wet or dry ice, simply ice and icing are legal.

Dry ice is nothing more than frozen CO2. And CO2 is used in everything from fountain drinks to welding. CO2 is inert. When dry ice boils, the frozen CO2 turns back into a gas, but it is still inert. There is no residue left behind. The fact is humans exhale CO2 every day.

The reason spray cans are illegal is because most of them use a propellant that is not inert. And they do leave behind a residue, most generaly a CFC of some kind.

There can be no performance advantage if somehow there was a large build up of CO2 under the hood and it
got drawn into the engine. As stated, it's inert. It would simply take up space that oxygen and fuel would normally take up.