Since I struggled with the cooling on my 912-S Tri gear for so very
long I thought I'd throw my thoughts into this subject. I have found
the air cooling of the fins to be inadequate. If you look at the round
inlets in relation to where the top of the engine sits you will find
they are too low and too outside. After trying everything to get mine
to cool on the ground and in the climb I finally got mad and took a
drummel tool to the inlets and opened them up a bit to the top and in
towards the spinner. For now... she looks a little sad but my CHT's
instantly dropped about 10 to 15 degrees. I'm going to work on the
inside of these holes next to provide an expanding 1" wall to eliminate
any turbulence of the incoming air flow.
Believe me I'v tried everything everyone has mentioned here from
closing up all the gaps around the rad to closing the gills. Nothing
did more for taxi and climb cooling than raising these holes. If you
look at all the LSA's with rotax engines the intakes are higher so the
air can get to the top of the engine before it's pulled or pushed down
through the fins. The real solution would be for rotax to start selling
plenums like the Jab's then route the hoses to fit over them.
Regards,
Jeff R.
A258 - N128LJ / Gold Rush 130 hours and enjoying every flight more.
PS. Jeff of Baby blue... If your making a mold that turns out
successfully try and saving it. I would love a better designed cowl.
;0)
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