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... unions to balance the feed. The above arrangement will ensure getting full discharge from the pumps. The engine should then give the following brake horsepower :— B.H.P. : R.P.M. : 69-0 5,000 73-0 5,50 74-0 5,800 73-0 6,00 These figures can now be increased by the fitting of the larger inlet and exhaust valves and 150 lb. valve springs as in Stage 2. The maximum power should then be 76 b.h.p. at 5,800 r.p.m. Larger Carburetters To increase still further, fit the \\" diameter competition car buretters, grind out the inlet manifold at the outer bores to \\" diameter to match these carburetters. It is not possible to grind right through l|" diameter, but it is necessary to taper off in about a £" length to 11* diameter. Maintain a minimum of 11" diameter or more right through, or otherwise a minimum area of 1-5 sq. in. These carburetters will be found to be fitted with light aluminium pistons, with additional return springs fitted above in the dashpots. For absolute maximum power these springs may be removed, but for good pickup and general carburation smoothness they should be left in position. Fit carburetters with -125" jets and V.E. needles, or richer—V.G., or weaker—V.A. On the same fuel and with other conditions as stated for Stage 3 (including large valves), the engine should give the maximum power of 80 ...
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