Since the last report on the 1968 Volvo 122s a few weeks ago, there has not been any spare time to do much to it other than to make some brake adjustments and get it registered. With any mechanical rebuild or restoration parts need to be located and purchased and with the use of the internet, and some occasional late night searching and emailing the many of the needed parts have been found.
Two months ago I was able to contact George Folchi, a machinist, who rebuilds Judson Superchargers in his spare time, and also supplies new old stock Ampco engine top end lubricators. George provided a new set new micarta vanes for the aluminum rotor that are visible in the lead photo and below set in the rotor slots. He machines them from micarta stock, the same material used for the originals; it is a strong and long wearing thermosetting plastic and cloth composite that is the same material that was used for “fiber” camshaft gears for decades.
- The slots visible above assist in collecting oil mist from the top end lubricator for the rotor slots and the sides and tips of the vanes.
If you return to the lead photo, the rotor and vanes are mocked up in about the same position in the housing bore that they rotate in with more a bit more clearance provided below the assembly. The assembly spins clockwise, and the vane on the far-right is shown at about five degrees before it begins to admit the fuel and air charge fed by the carburetor and the intake manifold at atmospheric pressure. It passes into the back side of the bottom half of the blower housing visible below and through to the inside via the diamond shaped openings at the bottom.
After the intake charge enters the blower housing, it is then compressed into the very small area under the rotor. If you follow the rotation sequence, the vane then begins emerge out of the rotor slot aided by centrifugal force and continues to rotate while the mixture is being compressed. The pressurized mix (5-7 psi) is then forced out of the blower housing through openings in its bore into the divided passage seen below at the top and into the intake manifold. Once into the plenum the compressed mixture enters a pair of intake runners and continues on to the ports in the cylinder head.
- The passageways on the backside of the supercharger housing that admit and discharge the fuel, oil and air mix.
A new old stock Ampco “Vapor Lubricator” seen below supplied by George Folchi will be used instead of the “Marvel Mystery” Oiler that Judson originally used with these units. The Ampco is a better design and will supply “Marvel Mystery Oil” through a spray nozzle into the top of the carburetor throat in the amount of about one drop very two-four seconds. After lubricating the blower housing and vanes, it passes into the cylinder head and serves as a top end lubricant for the engine. A quart of the fluid is needed every five to one-thousand miles depending on how it is used and adjusted.
After the rest of the maintenance and repairs needed for the car are finished up, this rebuild will be covered here. If things go smoothly, and I can find the time, the supercharger might be finished up and installed this fall.
View the earlier parts of this series here.
- The new old stock Ampco “Auxiliary Lubricator,” installation kit and the original instructions.