The SR engine is a series of 1.6 L (1,596 cc), 1.8 L (1,838 cc) or 2.0 L (1,998 cc) straight-four, four-stroke gasoline engines manufactured by Nissan. It has an aluminium head and block with steel sleeves and has a DOHC 4-valve design, with variable valve timing on select models.

The Nissan Lucino is a small automobile nameplate used by the Japanese manufacturer Nissan between 1994 and 2000. The Lucino name applied simultaneously to a pair of entirely different vehicles—a two-door coupé version of the Sunny/Sentra (B14)—and badge engineered versions of the Nissan Pulsar (N15) three- and five-door hatchbacks. For Japan, coupés arrived first in 1994, followed by hatchbacks in 1995. Production in Japan ended in 1999, except for the five-door that lingered on until 2000.