The Nissan KR engine family consists of three and four-cylinder all-aluminum turbocharged gasoline engines in both 12-valve and 16-valve versions with a variable compression ratio and variable valve timing developed by Nissan.

This is achieved by the movement of an actuator which changes the length of the piston stroke according to the demand for power.

[1] Applications: The KR15DDT VC-Turbo 3 cylinder engine is firstly introduced in the fourth-generation X-Trail.

Applications: The KR20DDET was announced at the 2016 Paris Motor Show as the VC Turbo which had Nissan's new variable compression technology.

[3] It was touted as the world's first production-ready variable compression ratio engine.