Kees van Beijmerwerdt's Engine Upgrade
Kees has recently installed this Judson supercharger to his original 1959 Sprite which was restored in 1982. The Judson has been rebuilt by George Folchi, and is fitted to an upgraded 950 engine, with small-dish Cooper pistons, compression ratio 8.3:1, lightened connecting rods, crankshaft and flywheel, all dynamicaly balanced. It has a Kent camshaft, 12G295 head with Rimflo valves and springs, a duplex timing chain with vernier adjustable cam drive, and a Kent oil pump. It also has a free-flow Maniflow exhaust with prototype Nardi silencer, and an upgraded 1275 clutch and standard smoothcase gearbox!!! Some pictures below show the 2 supports he has constructed to take up the weight of the Judson. He says: "The support bolt onto the exhaust is already a weak detail on the standard cast iron exhaust, and is certainly not working at all on the LCB pipes! It was a lot of fiddling to get it place and No, I did not make a drawing. It is all welded from steel strip to make it stiff enough".
For restoration of a Judson supercharger contact George Folchi via this link or this one. Kees says: "Simply dismantle and replace bearings (standard and available in any good bearing shop). Vanes play should be not to excessive (max 0.4 mm). New vanes are made by George Folchi in New Milton, Conneticut (USA) and sold at reasonable prices. George also does refurbishing of Judsons. Rotors are being remade in several places but are rather expensive, since it is an alloy casting on a steel shaft. I am happy to provide information if someone wants to do the job himself".
[KEITH LUCK is going to service Rod Robinson's supercharger and would be willing to do the same for others. He can be contacted by email and is based at Studham in Bedfordshire.]