The SR engine is a series of , or 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 engine was used in many small to medium Nissan vehicles, including high-performance turbocharged variants. It was designed by Nissan as a replacement of the earlier CA series of engines, and was replaced by the QR and MR series of engines. Power outputs are shown under JIS Net PS or ECE Net kilowatts unless otherwise indicated. SR16VE The SR16VE has Nissan's Neo VVL variable valve timing with lift control. It produces at 7800 rpm and at 7200 rpm. Redline is at 8300 rpm. Bore and stroke is with a 11.0:1 compression ratio. This engine was never used on the USDM counterpart of the B14 Lucino, the B14 Nissan 200SX, as it uses the 1.6 L GA16DE and 2.0 L SR20DE engines instead. It is used in the following vehicles: N15 Nissan Pulsar VZ-R B14 Nissan Lucino VZ-R B15 Nissan Sunny VZ-R SR16VE N1 This version was used in the limited-production Pulsar VZ-R N1, produced from 1997 to 1998. These cars were tuned by Autech Japan. It made at 7800 rpm and at 7600 rpm. Redline of the N1 Version 2 (1998) is at 8600 rpm. This is also claimed to be the most powerful production 1.6 L naturally aspirated engine. SR18Di The SR18Di is a DOHC engine. It produces at 6500 rpm and at 4000 rpm. Based on the Single Point Fuel Injection system, it was installed on JDM cars and some UK versions. This model used some cast iron blocks and it was used on the P10 generation Nissan Primera, but due to the low overall power this engine option was dropped on the next generation. This engine was never used on the USDM counterpart of the P10/11 Primera, the Infiniti G20, as it uses the 2.0 L SR20DE engine instead. It is used in the following vehicles: 1990-1993 Nissan Primera Nissan Sunny Nissan Bluebird U12 Nissan Avenir W10 SR18DE The SR18DE is a DOHC engine. It produces at 6000 rpm and at 4800 rpm. This engine came with Multi Point Fuel Injection System ECCS (Electronic Concentrated Control System). The SR18DE crankshaft was produced with four fewer counterweights than the SR20DE variants, which have eight, for lighter weight and better