Nissan has revealed the world's first production-ready variable compression ratio gasoline internal combustion engine.
The new engine has been designed to match the performance and fuel economy of the diesel and hybrid vehicles. The engine was unveiled at the 2016 Paris Motor Show.
This new 2-litre four cylinder engine features a new crank train and control system that enables the effective compression ratio to be varied between 8.0:1 and 14:1, depending on load.
The VCR engine achieves 27 percent better mileage compared to the 3.5-litre V6 engines which it replaces with comparable power and torque.
The variable compression ratio is achieved by raising or lowering the height of the piston reach within the cylinder The ratio can vary between high performance or high fuel efficiency.
Due to reduced side force on the reciprocating components in the cylinder during the operation, it minimises the friction between ring and bore.
Nissan claims that the variable compression engine produces 33 percent less vibration than the conventional IC engine, without the requirement of balancing shaft.
The fueling need of the engine is addressed by multipoint fuel injection for lower compression operation and direct injection for high compression operation.
The benefits of this new engine are - reduced fuel consumption and emissions, reduced noise and vibration levels and lighter and compact engine compared to conventional engines.