Wanting to use a few pieces of period-correct speed equipment on the 220 Station Wagon I bought a Judson Supercharger as can be seen above on a P1800. I had one in the past and was very satisfied with its performance which does not affect regular around town or highway driving at all. The blowers were also fitted to 544, 122s models.
The Judson is an axial unit using sliding vanes of micarda in an aluminum rotor and are held against the inside of the cast iron housing by centrifugal force. The unit starts generating boost pressure as soon as the rpms pick up coming off of idle speed and peak at redline at about 7psi and adds at least 30% more power, bumping the original 115 hp. up to 149 hp. The vanes are made of reinforced micarda, a tough thermosetting plastic and cloth composite that is the same material used for Volvo "fiber" camshaft gears.
It utilizes four sliding vanes that are mounted at an angle to an aluminum rotor with an alloy steel shaft supported by ball bearings. The vanes themselves weigh half as much aluminum, but are less subject to heat expansion. The rotating assembly is lubricated by the gasoline and air mixture and Marvel Mystery Oil supplied by a Marvel Oiler as seen below. The supercharger drive ratio is 1 to 1.101 and it spins at 6055 rpm at redline.
In the 1950's and 60's the Judson Research and Manufacturing Company of Conshohocken, Pennsylvania made these vane type superchargers for Volkswagen, MG, Triumph, Volvo and other cars including the Mercedes 190SL. The blower bolts on and does not alter the rest of car in any way.
The rebuilding process will be shared w/you here and on TheOldMotor.com
The chart below shows the performance enhancement on an earlier 544.
