4 feet of 2.75" dia. SCAT running to a naca scoop on bottom of cowl was
enough to ruin the power on my installation. The difference between this
and my current short ram air scoop was dramatic. The power loss was
due to both pressure loss and heat rise but I don't know which was predominate.
Keep air inlet plumbing clean, short and cool. It really does
matter.
Tracy
Paul
C wrote:
I was thinking of installing two small NACA ducts on the
bottom of my cowling with two hoses coming up to feed air to my TWM
throttlebody. The NACA ducts I purchased from Van's RV (made for cowling
ventilation) already have a male outlet already molded in the assembly, so you
just slide a hose over it and secure with a
clamp
---------------------------------------------
Paul, you
will have to make sure the NACA ducts are mounted on a pressure surface and
not a suction surface or you may be very disappointed in their recovery. How
far do you have to route the air to the T/B plenum. Tracy picked up a lot of
heat when he used SCAT tube for intake ducts and lost power. He was not sure
whether it was pressure loss of heat rise causing the problem. What do you say
Tracy?
I would be very tempted to copy Tracy's periscope and put hard
smooth pipe to the plenum to extract all the power possible.
Bernie,
DAR coming next Tuesday, still waiting my new injector
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