Nissan Infiniti will present its first VC-T(Variable Compression Turbocharged)engine,next month in Paris motor show.This technology took them about 2 decades,and the result is a high performance engine with greatly increased fuel efficiency.
Here’s how it works:
As explained in the picture above,by changing the stroke length,the engine can infinitely vary its compression ratio between,8:1 and 14:1.
When the engine’s control logic electronic thinks you need more power,the actuator arm works on the control shaft to change the position of a multi-link,pivoting around the connecting rod’s main bearing,lowering the piston in the cylinder. This decreases the compression ratio,allowing the turbocharger to produce more boost without the risk of pinging or detonation with variable compression.The opposite will happen when you cruise in top gear.The system will go for the highest compression possible,to improve fuel efficiency. The engine’s electronic valve timing and port-plus-direct fuel injection,allow it to switch between normal and Atiknson cycle,operation on the move.Infinity says that this technology gives the engine the torque and the efficiency of an advanced turbodiesel without the emissions.Even though the power figures of the 2.0 liter VC-T are still unknown,from the outside it looks like a normal 4 cylinder with a turbo.