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Date: Thu, 31 May 2007 17:24:39 -0400
From: Bill Bradburry <bbradburry@allvantage.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Intake CFM air flow
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Thanks, Bob.
Did you enclose it or did you take the air from inside the cowl?  I am 
wanting to put the filter inside the ram air tube from the front of the 
cowl to the throttle body.  Building an enclosure around it makes it get 
pretty large and that makes me need to move it to a location inside the 
cowl that causes a fairly convoluted run of tubing.....sigh...

I am really open to suggestions...

Bill B

Hi Bill,

I used the K&N RR-2803 because it fit my throttle body and allowed air
in thru the sides and center. I don't see anything on K&N's site that
tells me it's area, but it seemed to work OK. I had it pointing
straight to the front. It's 5.875" OD at the base, 5.25" OD at the top,
and 5" high and fits a 2.75" throttle body.

Bob W.

On Thu, 31 May 2007 16:16:32 -0400
Bill Bradburry <bbradburry@allvantage.com> wrote:

 > Does anybody know what the CFM intake air flow is on the rotary? I am
 > thinking about the size of air filter I would need. For instance, what
 > size K&N filter would I use? I would like to provide ram air thru the
 > filter.
 >
 > I was considering the conical type filter, but it looks like the size of
 > it may be a show stopper. I am pretty limited in the space available
 > for a filter and do not want to make too convoluted a path to the
 > throttle body. What is the best guess on the number of square inches of
 > filter required?
 >
 > Any help would be appreciated.
 >
 > Thanks,
 > Bill B