Robert Paxton McCulloch was a skilled Stanford University engineering graduate who inherited a considerable sum of money from his multi-millionaire grandfather at an early age. This gave him the financial freedom to indulge in two of his passions, boat racing and engineering, which eventually...
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McCulloch advertising of the period claimed a 38% increase in Horsepower, better gas mileage, smoother performance and a longer engine life. More than 5,000 of the superchargers were sold during the late 30’s, but production was discontinued during the early 1940’s due to two reasons. The impeller for the supercharger, being gear driven, and being lubricated via the engine oil system which was often not changed as regularly as it should, had a tendency to become quite noisy with wear, and the blower, due to its fixed ratio of 6:1, produced no significant boost until high rpm was being achieved by the engine with boost levels being no more than
4 psi, even with radical reworking. These facts failed to impress the general public, and sales were low