Subaru EN engine

The Subaru EN series is a family of four-cylinder, four-stroke engines used in the kei cars Subaru sold in Japan. It was introduced in 1989 as the 547 cc EN05, succeeding the two-cylinder EK family, and was discontinued in 2012. When Japan revised the kei class to 660 cc, the stroke was lengthened to make the 658 cc EN07, a decidedly long-stroke unit. While other makers adopted three cylinders, Subaru stayed with four, marketing the engine as the Clover 4 with a clover-leaf mark cast into the head. Variants included carburettor, multi-point injection and supercharged versions, and a DOHC 16-valve version with variable valve timing for the R1, R2 and Stella. Exported cars used the larger 758 cc EN08. The EN powered the Rex, Vivio, Pleo and Sambar, and in 2009 the EN07 powered three of the five most fuel-efficient kei passenger cars.