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Date: Mon, 12 Nov 2007 16:08:56 -0500
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From: Lorn H Olsen <lorn@dynacomm.ws>
Subject: Re: Cowling Air Intake Question

Matt,

I also have a sealed carb box designed for an RV-4. My carb inlet is  
on the bottom. The original design had a spring loaded door on the  
bottom of the box that would open to warm engine air in case the  
inlet was jammed from ice, water or whatever. I did not install this  
spring loaded door. 3 years ago, when I installed the carb air box, I  
also drilled a 1/8" hole in the bottom back end of the box for water  
to escape. As you are, I was always afraid that the water could build  
up in the air box and flood the carburetor. After 3 years of flying,  
sometimes in extremely heavy rain, I am now satisfied that the small  
1/8" whole is enough to stop rain water from causing a problem.

If you wanted to test on the ground, you could use a garden hose.

Lorn


> From: Matt Reeves <mattreeves@yahoo.com>
> Date: November 11, 2007 7:03:45 PM GMT-05:00
>
> This makes me a little more comforted, but if I have a sealed  
> system with nowhere for the rain to escape, it almost seems rain  
> can collect in the carb and I always thought one drop and the  
> engine quits.
>
> Maybe I'm just being a little paranoid but how does the rain get  
> out? Should I drill some holes in the bottom of my fiberglass airbox?
>
> Matt

--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, FB90/92, O-320-D1F, 1,300 hrs, N31161, Y47, SE Michigan