The automotive research group Ricardo and a consortium of automotive partners have announced the completion of an advanced prototype research programme based on a new 2/4SIGHT engine concept. This petrol engine concept uses new technology to enable automatic and seamless switching between two- and four-stroke operation. The aim of the new engine is to deliver significant performance and fuel economy improvements from a smaller engine.

The 2/4SIGHT engine concept is based on a 2.1-litre V6 engine, which is claimed to deliver the performance of a bigger 3.4-litre V8 engine. It used a direct injection petrol combustion system in which the design of intake and exhaust ports, combined with changes in boost supply, fuel injection, ignition and valve timing, enable operation both in two-stroke and four-stroke modes.

An advanced control system enables smooth transitions between two- and four-stroke operation without torque interruption in both transient and constant torque conditions. The new technology has shown power improvements with lower emissions from a petrol fuel and the opportunity for lower engine manufacturing costs. Engine torque levels are high from the new system, while CO2 emission levels at 190 g/km are closer to diesel engine levels.

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