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Nissan PR engine
The PR engine is a gasoline inline-four piston engine with a displacement of 2.5 L (2,488 cc) that was introduced in 2018 by Nissan.[1] The motor has an aluminum block and head, and has a dual overhead camshaft (DOHC) four-valve design with variable valve timing and direct injection. The engine is heavily based on the QR engine but has 95% different parts.[2] The engine is used in compact and midsize applications by Nissan and Mitsubishi via the Renault–Nissan–Mitsubishi Alliance. PR25DDThe 2.5 L (2488 cc) PR25DD has a bore and stroke of 89 mm × 100 mm (3.5 in × 3.9 in) with a compression ratio of 12.0:1.[3] Compared with its predecessor, the QR25DE, it has an increased compression ratio, iron mirror-finish bore coatings instead of cast-iron cylinder liners, and a resin intake port insert to insulate charge air from heat from the cylinder head. It also has electrically actuated variable valve timing, a variable displacement oil pump, integrated exhaust manifold, and cooled EGR. These features were added to increase fuel economy and lower emissions while increasing power output.[4][5] It was first introduced in the Nissan Altima, where it produces 188 hp (140 kW; 191 PS) at 6000 rpm and 180 lb⋅ft (244 N⋅m) of torque at 3600 rpm. It was later introduced in the 2021 Nissan Rogue and 2021 Mitsubishi Outlander, where it produces 181 hp (135 kW; 184 PS) at 6000 rpm and 181 lb⋅ft (245 N⋅m) of torque at 3600 rpm.[6] Vehicle applications:
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