Actually I don’t have any really good pictures because I took it apart … but attached is a side-view after removal of the inlet diffuser on top and also a sketch of approximate scale and shape of what I tried to make, (I don’t have a damper plate or cowl flap yet).  The top shape isn’t quite right; needs to be pinched more at the rear, also am considering a turning vane to direct more air through the front half.  Trying to make air bend 90 degrees twice isn’t easy but I chose this orientation because of the desire to add a damper at the output for winter operations.  I could drop the rear of radiator and bring air in through the bottom, spilling out over the engine but would lose the ability to have a damper – I don’t like the idea of inlet dampers.  On top of it all, my climb speed is usually only 90 mph; I don’t have the ability to get extra pressure from increased airspeed.   P.S. the radiator is the Griffin 2-58185-X, same as several other installs on this list.

The top plenum was out in the SUV; hopefully more attachments in next post …

Jeff

Well, the second flight occurred last night with same results as before; one short low-level circuit due to insufficient cooling … looks like Al Wick made the correct prediction.

There are 3 things I can try with the current configuration: 1) Increase inlet area 2) Increase outlet area (adjustable cowl flap) 3) Re-profile the pinched diffuser.  I will do all 3 and see what happens.

If all of the above show remarkable improvement then repositioning the radiator is the only alternative.

Jeff