Variable compression ratio engine 2

Position of orange cradle of the blue crank shaft determines compression ratio of violet piston cylinder. It gives different volumes of the combustion chamber. There is an offset between the blue crank shaft and the cradle axes. The position is controlled by yellow crank shaft connected to the cradle by pink conrod. A cylinder and rack-gear drive for turning the yellow crank shaft are not shown. The video shows the shifting process from high compression ratio to low one and then back to high one. Disadvan