Abstract
Power and torque improvements of 30 per cent and 26 per cent respectively have been produced by turbocharging. A compression ratio of 7·6:1 is employed and petrol of 97 octane number RM is adequate.
An acceptable torque curve has been obtained by the use of a turbine outlet restrictor; the standard intake manifold is retained and the compressor delivers to the standard carburettor. A unique combination of vehicle performance and driveability has resulted and exhaust and intake noise is readily controlled.
Only minor engine component changes are necessary and mechanical reliability presents no problems. Specific fuel consumption is no higher than that of the normally-aspirated version of the engine, and emision of oxides of nitrogen is low.
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