Yea see thats the problem I thought was going to happend but when i saw a the car the guy told me they never race in the rain but they have it so its removeable and set a regular air filter and a cap that closes the gap.
Sound good?
The air flow flows into the chamber at a high pressure so it kinda gives it a boost of air.
Cowl hood works the same way. The cowl vent in your car presently feeds air into the cabin when you use the heater, which is not a factor in race cars.
Why wouldn't it work in the rain? When you drive in the rain now and have the vents open, the floor doesn't get wet now does it? (Or it shouldn't )
All you'd need to do is make the base that fits up against the cowl, don't make the floor of the duct even with the floor of the cowl and any water that enters the cowl vents will go out the drains as normal. I'd make a piece that attaches to the cowl permanently that would stick out past the braces and have an angle cut to it with a flange for some foam weather strip. Then make the base with a flange that fits up against the foam. This makes the base easy for removal, if you do it right, you should still be able to remove the valve covers with the cowl piece in place, the carb stud will hold the base in place.
I was just thinking about a cowl induction set up like this...I have yet to see anyone who has done it yet. Its also just a great way to get cold air into the engine instead of sucking in all that hot air.
While a lot of guys don't do that particular method, a cowl induction hood utilizes the same air that that would use.
With the opening at the back of the hood, it's VERY common to see guys building sheetmetal enclosures that seal the hood to the carburetor and then have an opening out back to take in the fresh air. Water is over rated. Don't worry about it