An overly-concerned friend had warned me that this plenum chicanery would create severe overheating and cause the pistons to melt and drip out the bottom spark plug holes. But after racing over the hundred degree prairie for a few weeks, I had tried smaller tunnels and was now modifying from the gorilla external scoops to the first of four sets of smaller internal NACA inlets over the spar. He came by and said, “So, you’re having cooling problems, huh? I told you so.” I told him that yes I was having cooling problems… the CHTs were too cool and I was reducing the inlet size, again.
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