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The roots supercharger would be run at a constant RPM, the speed at which its Volumetric efficiency would be maximum. The diesel could then run at its rpm where it's fuel efficiency would be greatest. This all being done while not producing any more horsepower requirements from the vehicle's drive engine. All of the additional power output of the engine could then go into propelling the vehicle. Taller gearing could then lead to lower RPM without sacrificing the superchargers efficiency at the cost the fuel consumption of the small diesel, which I believe to be quite stingy.
D Morgan
WEGMOR
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