MG Midget XPAG Engine Tuning - Seite 14
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... 5. Fitting the "Shorrock" Supercharger in con junction with 9.3 to I compression ratio Fit the " Shorrock " Supercharger Kit and raise the compression ratio to 9.3 to I, as explained in Stage 2. Fit the larger exhaust and inlet valves and 150 lb. valve springs. Fit a -125" jet to the carburetter and a T.3 needle and seat to the floatchamber. Use carburetter needle V.G. (with |" shank), or richer—V.I (with -|" shank), or weaker—V.E. (with -|" shank). Use twincoupled S.U. petrol pumps. Sparking plugs : Use Champion L.A. I I or L.A. 14 or Lodge R.49 or R.5I. Use a fuel 50% methanol, 20% petrol, 30% benzol. 1% castor oil may be added. The engine should then give the following brake horsepower :— B.H.P. : R.P.M. : 55-5 3,000 73-5 4,00 85-5 5,000 88-00 5,50 88-00 6,000 To obtain a further increase in power, fit a larger carburetter (S.U. Specification No. 538, Type H.6, If" diameter) to the supercharger. It will be necessary to make a new elbow (steel or aluminium) between the carburetter and supercharger with an inside diameter of If". Make sure the inlet port to the supercharger matches up and is of the same diameter. Use a -1875" diameter jet in the carburetter and needle R.M.7, or richer, R.M.8 ; or weaker, R.M.6. With a fuel of 80% methanol, 10% petrol and 10% benzol, the engine should give the following brake horsepower :— 14 ...Source:Archiv
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| Vehicles in this Facsimile | MG TC (1949) MG TB (1936) |
| Brand dossiers | MG |
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