Powerplus supercharger

The Powerplus design was the invention of Captain George Eyston, the land speed record holder.

All of MG's superchargers were mounted ahead of and roughly in-line with the crankshaft, between the chassis dumb irons [definition needed].

Eyston was also a noted racer of MGs, particularly his K3 Magnette in the 1933 Isle of Man and 1934 Northern Ireland Tourist Trophy races[3] and the Mille Miglia[4] (both reprinted in [5]) Although these were not intended as everyday road cars, MG set out to produce competitive 'clubman's' racing cars at an affordable production-line price.

Although the simple sliding-vane design is straightforward to manufacture, having simply shaped component parts, the spring-loaded vanes rub on the housing and this friction requires lubrication.

By adding a set of eccentrics and guide slots to the axle of the supercharger, the Powerplus actively controls the position of these vanes, such that they maintain a constant small clearance from the walls of the housing.

Although each component was of simple form, there was some number of them, including a separate Bosch oil pump.