Ben Baltrusaitis wrote:

Paul,
I remember you talking about an alternate air source for the ram air system. I came across this system and it seems really simple to fabricate:

http://www.sdsefi.com/rv4.htm

Scroll about half way down to see it. I also attached a picture.
Ben

This looks like it provides air if the ram air intake gets iced
over. Not the same as a valve that can be selected for dirt or
dusty  runways or ram air at high altitude cruise.

"After considerable planning and an evaluation of available space, I constructed an octangonal plenum box from aluminum to surround the
K&N air filter. I also machined an adapter to step down the 3 inch air filter neck down to the 2.5 inch SCAT hose diameter which will feed the
turbocharger. Twin brass reed valves are incorporated into the plenum for an automatic alternate hot air source in the event that the main feed
ices over. Cold air will be ducted from the left radiator plenum via 2.5 inch SCAT hose. The airbox plenum will be mounted to the lower left
engine mount tubes."


Paul Lamar
 
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