One aspect of streamlining is that the noise that develops inside is incredible. Even in our pedal powered liners the noise level gets pretty high. The bodies tend to resonate over the road like a transducer.
I am guessing that if you add a clattery air cooled diesel even if the engine is isolated by a firewall, you won't hear the traffic around you.
Perhaps someone who has built or ridden one can add. Might make a good case for having the engine water cooled and somewhat isolated from the rider.
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