Corky Scott wrote in message

You can probably improve the inflow by attaching scoops on top of the
Naca inlets. I'd recommend the scoops be standoffs, like the P-51
belly scoop so that you do not have turbulent boundary air flowing in
and disrupting the flow. You can even shape them to emulate the shape
of the Naca inlet where they attach to the opening. This should be an
easy thing to fabricate and attach for a test. Just tape them over
the inlets and fly. If you see the cooling improve, you're on the

Yes, that's a good plan except in my case I cannot "...Just tape them
over
the inlets and fly." because if one gets free it will go thru the
prop! However (as seen in the photo), there is a series of top
cowling screws that I can use to secure a temporary scoop.

Sid