Frank Lee
If thermo-siphoning still allows the system to work while hot that would be lovely. On the surface area note, would an undertray cool better, its in the shade? I would probably put the tubes away from the road, some of the pot holes around here get big & unavoidable.
LeanBurninating
If you can get the engine warmer than it normally would be, it would have benefit until operating temps are acheived. Especially if you don't have to use any electricity per Frank Lee's suggestion. On a hot day it still takes a few minutes for an engine to get up to temp. It was more of a possible benefit if done right thought.
Don
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