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Chris Z knows what he's talking about... I have his
cowl and inlet/diffusers and plenum on my bird and - depending on which data set
you choose to believe, is around a 15 to 18 mph increase for my airplane.
(Thanks, Chris!)
A byproduct of his cooling/cowl system was a rise
in my oil and cyl temps - and I actually NEEDED that. I was running 180 on
oil and something around 280-300 on cyl. I had way too much cooling air going in
and a very large scoop. It seemed like there was a large surplus of air going
into the airplane with the stock 4 in dia. inlets and the large scoop exit area.
Those got choked down significantly. My quest was for speed and I understood and
accepted the rise in my temps. I actually needed that - even here in PHX on a
hot day.
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