Ricardo Engineering Consultants (the company that designed and produced the Bugatti Veyron’s DSG gearbox and designed the JCB Dieselmax’s engine) has produced a prototype 2.0 litre V6 engine called the 2/4SIGHT, which can seamlessly switch between 2 stroke or 4 stroke mode. It produces the same amount of power as a conventional 3.5 litre V6 engine, while having reduced fuel consumption of up to 27 percent.
The prototype Ricardo 2/4SIGHT engine achieved high torque levels of over 300Nm at 1,000rpm and 460Nm of torque at 2,500rpm.
The prototype also uses other technologies such as electro-hydraulic valve actuation, direct injection, and two stage forced induction combining the use of a Rotrex supercharger and a Honeywell turbocharger. The forced induction system is only in concept form – the actual prototype uses pre-compressed air from an external compressed air supply for simplicity sake.