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... 4. Increasing performance by fitting the "Shorrock" Supercharger Kit This kit is manufactured by " Shorrock " Superchargers Ltd., Moorlands, Garstang Road, Preston, Lanes., England. It is an eccentric vanetype supercharger with balanced pressure lubrication system. It is mounted on the inlet manifold and driven by twin belts from the front end of crankshaft. It gives a large increase in power at the lower and medium engine speeds. Details of Supercharger :— Drive ratio : 1-16 to I stepup on engine speed. Swept volume : -72 litres per revolution. Boost pressures : R.P.M. : Lbs. sq. in. boost (approx.) : 1,000 1-5 2,000 2- 3,000 3-8 4,000 5-5 5,000 6-0 Oil metering pin diameter : -304" diameter, fitted in a reamed housing bore of -3125" diameter. Supercharger oil feed tank : Use oil S.A.E.30. Carburetter : S.U. If". Standard needle : R.L.S. Jet size : -090". With :— 1. The supercharger kit fitted to a standard engine (see Standard Data). 2. Pool petrol (70 octane). 3. Plugs : Champion L.II.S or Lodge H.N.P. 4. Tappet setting -022". II ...
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