The first picture didn’t show it but I made an air box and have plumbed a 2.5” air inlet to the cowling using SCAT tubing ... see these photos.

I know the heater will work to some extent – haven’t flight-tested it yet to know how much; however, my worry is about how rugged it will be, even though it is dampened by rubber all around and at the hose connections.

Jeff

I've read multiple accounts of successful use of the heater as extra cooling capacity, and heard another account just this weekend. But all require cool air flow through the heater core to remove the heat. How do you move air through that core?

Charlie

Any thoughts on using the Mazda oil cooler for additional water cooling; i.e., connecting it up as big heater core, using the 3/4” block outlet and returning to the suction side of water pump?

I have temporarily plumbed in an actual heater core (8”x6”) but am not too confident in its durability ...

Jeff