Glenn
Which Subaru conversion did you use, the weak link often seems to be the
reduction drive.
Graham
GLENN CROWDER wrote:
> I created an almost exact copy of the Kuchemann/Weber perfect
> diffuser on my Europa to try and keep my 135 hp EA81 cool.
> All cooling on the EA81 is thru the water jacket and none is done by air
> cooling on the 912/914 so the ducting has to be good.
> Both cooling in the air and ground are very good. I can run the
> engine as long as desired at 1800 rpm on the ground without over
> heating even on a 100 F day. In the air, water temps to go 200 F
> after a 2 minute climbout then drop back to 185 for cruise.
> There is a 12" long diffuser section that expands like a bell to
> slow and pressurize the incoming air. After the rad, there is a
> converging duct that accelerates the hot air back to free stream.
> There also is a pull up cowl flap inside the converging section
> that allows most of the incoming air to be shut off under cruise
> conditions, adding 10 mph by cutting the flow and associated
> drag when its not needed. Works great!
>
> Glenn
>
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