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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