Good points, Ed. It occurs to me
that the reason “lazy8s” setup could result in ram pressure is that
the cowling is seeing about the same ram pressure as the induction intake, so
there is little or no flow in or out of the filter.
Al
I agree, Bill, very creative.
However, while it appears to give him a nice increase in MAP due to Ram air,
from what I have been reading about those types of filters, two thoughts come
to mind:
Given that the filter elements offer
little resistance to air flow what keeps
1. The Hot air under the cowl
from being ingested through the sides of the filter even when the ram butter
fly is open - I would expect most of the air to be ram air but not all. I
presume the higher ram pressure would in effect act as a positive pressure area
and keep the hot air out, in which case it brings up the next question.
2. What prevents, The ram
air (since its at higher pressure ) from leaking out through the sides of the
filter when the ram valve is open? Is it just not enough to make any
difference - hard to believe given all that filter area.
----- Original Message -----
Sent: Thursday, May 05,
2005 6:56 PM
Subject: [FlyRotary]
Ramair-airfilters-Revisited
There
has been an interesting thread on ram air and filtering on the RV list. Here is
a link to a clever looking solution:
http://www.lazy8.net/intakesystem.htm
Looks simple and
lightweight, but I am not quite sure where you would mount it on a rotary.
Also, it doesn't have a bend in the path to drop out bugs and big chunks when
the valve is open. This is easily corrected, however.
and a more
traditional approach
http://www.rvproject.com/ramair.html
Again, no
"bug bend".
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