Steve, 

What Tracy posted trumps anything I say, as he has the vastly overwhelming experience here.  But thought I would weigh in on the subject anyway, just for some variety.

I have tried running with and without air filters and didn't see any noticeable difference in performance.  So, I left the filter in place as any small FOD could be very costly.  I'm running a K&N conical filter, fed by the left air inlet (approx. 5.5" dia.).  The rubber end that has the K&N logo on it faces into the wind.  There is a cone-shaped housing with a small hole in the bottom to let any trapped water escape although I try to never fly in the rain.  I don't have an alternate air source.  This setup has served me well for 100+ hours.  

Mark

On Thu, Jul 4, 2013 at 8:08 AM, Stephen Izett <steveizett@me.com> wrote:

Thanks Tracy.

Steve

On 04/07/2013, at 8:47 PM, Tracy <rwstracy@gmail.com> wrote:

On Jul 4, 2013, at 6:18, Stephen Izett <steveizett@me.com> wrote:

Hi Guys

I've got to feed air from a under the spinner to the throttle body.
I'm interested in Ram Air but have some questions.

1. What do we do about a bit of rain getting into the system? I gather ice and snow is a huge problem and some designs have bypasses.

Rain good, just like ADI.   Flight into iceing & snow heavy enough to block intake would probably have crashed you long before  the inlet was blocked.  bypass not a bad idea but lived without one for 2000 + hours.

2. I take it that filtering is essential. How does water effect filter material? What filter material is best.

On a car, a must.  On an airplane, just be careful where you put inlet ( keep it high) and don't taxi behind someone on a dry dusty taxiway.   Never had an air filter.

3. Is there a valve available to purchase to switch between filtered and non filtered ram air?

Cheers

Steve Izett




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