based on this from the SCCA Stock rules -2007:


13.10 ENGINE AND DRIVE TRAIN
A. The engine air filter element may be removed or replaced. A
replacement element which is taller than standard may not be
used to hold the air cleaner cover open. No other components of
the air induction system may be removed, replaced or modified.

Do you think it would be legal to dump a bag of ice into the airbox?

I have tried this on very hot days and there is a difference.

Here is the idea behind it:

K&N air filter in place
bag of ice dumped in stock air box and closed

ALL air coming in the motor must pass through ice cooling the air significantly
minor water vapor that passes through K&N acts as water injection (minor but harmless effect)
Ice that melts in box does so at a rate that does not overwhelm the factory supplied air box drains
In the end, ice melts, K&N dries out.

comments?
thoughts?

 

Tried it on the dyno? That's the only place you'll get any real info.

Wouldn't be legal anyway, you're going to drip water everywhere, including on the course. That's if it actually cools the air and melts at all, which it probably won't do much of - in which case, it'll just be an extra 5-10 pounds right where you don't want or need it (on the nose of the car), restricting your intake.

The really anal types put bags of ice on their intake manifolds between runs to keep it cool. You'll usually only see that done in Topeka.

I checked in to this thread as I use ice to cool the intake in my SCCA autocross car, it'll melt about 10 pounds of ice in one run, but it's not Stock class any more...

 

How about using dryice? (the extra CO2 negligible? or use around the intake pipe)

 

I looked and cannot find anywhere that says dripping water on the course is illegal (unpopular I'm sure ) It would be no more water than if you ran your AC in grid or on the course.

I can't imagine that the ice would restrict the intake. It is a huge box with a relatively small opening.

The box holds 3-4 pounds of ice. Just take 2 lbs of air out of each front tire.

Ice on the manifold does not significantly cool large masses of moving air (about 10.6 cu ft per second at 9000rpm) - it does cool the intake air temp sensor making the computer pull less timing. This means no hp gain at all, just no hp loss from pulled timing.

On the other hand, you do pick up 1 hp for every 11 or so degrees of lower air temp.

So if the air is cooled 30 degrees for 3lbs of ice, thats 3hp for 50cents.

To get the benefit, the AIT sensors should be fooled also.

 

[QUOTE=tpc0531,May 18 2007, 08:26 AM]I looked and cannot find anywhere that says dripping water on the course is illegal (unpopular I'm sure )

 

that's what I'm here for

 

7) No excessive fuel, oil, water or brake fluid leaks should be
observed when the engine is running. For all Prepared and
Modified category vehicles, engine crankcase and radiator
overflow/breather lines must terminate in containers of at least
one quart capacity. These containers cannot be vented into
the driver/passenger compartment. All Prepared and Modified
category vehicles must be equipped with an engine oil vent
tank, and an engine coolant vent tank if coolant is used. Vent
tanks are not required with systems which are completely
closed, i.e. have no venting to the atmosphere. All oil lines
passing through the driver/passenger compartment shall be
made of metal braided hose with AN Series threaded couplings;
or entirely covered and protected with a metal cover
(this does not apply to the small oil lines used for mechanical
oiling system gauges).



I don't think we are talking about an excessive amount of water here. Unless, of course you do this and win your class at nationals by .001sec. Then it would be considered "an enormous amount of water approaching biblical proportions"

 

why not just put 2 lbs of helium in?

 

could always put ice into bag(s) seems to me however that the effect would be minimal at best. I would try first rerouting the coolant line that circulates the TB. This obviously heats up the TB alot. I may try it just to see.

 

Dryice colder, lighter, no drip