The inside housing of the generator is turned down to make the alternator fit inside. Even with a heat transfer compound between the two, the Gener-nator overheats. There is also the issue with the internal fan moving enough air to keep the unit cool.
The design is patented (see attachment).
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
