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Diesels and blowers and black smoke.
Diesels are unthrottled engines, the air intake is wide open all the time. Before electronic fuel injection, mechanical injectors basically just dumped a whole bunch of fuel in the engine when given full "throttle" at low engine speeds. They had a large amount of fuel remain uncombusted until the rpms rose and the air-fuel ratio evened out. That is why you still see older diesels pumping out black smoke when accelerating, but newer ones don't. The wonders of computers.
By the way, the famous GMC blowers, the basis for all the vane type blowers seen on drag racers, were originally made for GMC two stroke diesels.
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