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Mitsubishi Motors Corporation presents the newly-developed 2-liter engine, which we have named SIRIUS DASH. The SIRIUS DASH engine, with its compound intake system, features great performance in both high and low speed ranges while keeping fuel consumption low. The compound intake system operates the 3 valves in 2 stages. When engine speed is low, just one intake valve is used, but when engine speed increases, two intake valves are used. And to make this engine truly extraordinary, we added a turbocharger with an intercooler, and equipped the whole thing with a total electonic control system. Generally, high performance engines which have large inlet ports and high speed type valve timing enabling them to intake sufficient air for high performance at high speeds. The problem is here that when speed is dropped, combustion becomes unstable at the expense of torque and fuel consumption.

A new combustion system - called MCA-JET- has been developed to improve combustion under the low speed, low load conditions typical of urban driving. Engines with this new system incorporate a special “jet valve”, in addition to the inlet and exhaust valves of the conventional combustion chamber, which directs air or a super-lean mixture towards the spark plug, and induces a strong swirling flow in the cylinder. This swirl persists during the compression and expansion processes, moves the mixture spirally and helps the flame to propagate. As a result, the combustion of lean mixtures, including those with exhaust gas recirculation, can be carried out rapidly and thus the fuel economy improved.