Hot Air

[Skippydiesel]

My Legacy/Rotax 912ULS, fitted with custom/home made cowling, has a hot air in the vicinity of the carburettor air inlets.

The under cowl temperature, 50 mm in from the top of the firewall, is roughly 20 degrees centigrade above ambient. I would like it to be no more than + 10C or lower.

I am considering two small (70x70mm?) exit air vents Located;

near the rear edge of the top cowling, above each carburettor
on each side of the lower cowling near the rear edge, a bit below each carburettor

The idea is to encourage greater air movement in the vicinity of the carbs, in the hope that cooler air from the front of cowling inlets, will get to the back of engine bay quicker, with less temperature rise.

Any thoughts / ideas would be most welcome.

[Bryan Cotton]

Borrow some ideas from us AeroVee guys
viewtopic.php?f=7&t=4465