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Reciprocating internal combustion engine From Wikipedia, the free encyclopedia
The QR family of inline-four piston engines by Nissan were introduced in 2000 and range from 2.0 to 2.5 L (1,998 to 2,488 cc) in displacement. These motors are aluminum, dual overhead camshaft (DOHC), four-valve designs with variable valve timing and optional direct injection. The engine shares much of its architecture with the YD diesel engine.
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (March 2019) |
| Nissan QR engine | |
|---|---|
A Nissan QR25DE Engine | |
| Overview | |
| Manufacturer | Nissan (Nissan Machinery) |
| Production | 2000–present |
| Layout | |
| Configuration | Inline-four |
| Displacement | 2.0 L (1,998 cc) 2.5 L (2,488 cc) |
| Cylinder bore | 89 mm (3.5 in) |
| Piston stroke | 80.3 mm (3.16 in) 100 mm (3.94 in) |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Valvetrain | DOHC 4 valves x cyl. with VVT |
| Compression ratio | 9.1:1-10.5:1 |
| Combustion | |
| Supercharger | On QR25DER only |
| Fuel system | Port Fuel Injection or Direct Fuel Injection |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 103–186 kW (140–253 PS; 138–250 hp) |
| Torque output | 200–330 N⋅m (148–243 lb⋅ft) |
| Chronology | |
| Predecessor | Nissan SR engine Nissan KA engine |
The 2.0 L (1,998 cc) QR20DE produces 140 PS (103 kW; 138 hp) at 6000 rpm and 200 N⋅m (148 lb⋅ft) at 4000 rpm. The bore and stroke is 89 mm × 80.3 mm (3.50 in × 3.16 in) and a compression ratio of 9.9:1.[1] The QR20DE was replaced with the MR20DE engine in most applications in early 2005.
Vehicle applications:
The QR20DD is similar to the QR20DE but features NEO direct injection to improve fuel economy and to reduce emissions. It produces 150 PS (110 kW; 148 hp) at 6000 rpm and 200 N⋅m (148 lb⋅ft) at 4400 rpm.[1]
Vehicle applications:
The QR25DE is a 2.5 L (2,488 cc) variant built with cast steel connecting rods, a steel timing chain, counter-rotating balance shafts, and an aluminum intake manifold. The engine bore and stroke is 89 mm × 100 mm (3.50 in × 3.94 in) and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle.[2]
Output is rated 175 hp (130 kW; 177 PS) at 6000 rpm with 244 N⋅m (180 lb⋅ft) of torque at 4000 rpm in the Altima 2.5 and Sentra SE-R models. The Sentra SE-R Spec V originally claimed 180 hp, but this was adjusted downward to 175 once production started in late 2001.[3] The redline is 6100 rpm.[3] Altimas that are PZEV compliant create 170 hp (127 kW; 172 PS) and 175 lb⋅ft (237 N⋅m) of torque. In the 2005+ Nissan Frontier the QR25DE generates 152 hp (113 kW; 154 PS) and 171 lb⋅ft (232 N⋅m) of torque.
The revised QR25DE found in the 2007+ Sentra, Altima, Rogue, etc. has a number of improvements over the older QR25DE. These include:
The QR25DD is similar to the QR25DE but increases the compression ratio to 10.5:1 and includes direct injection. This engine is also the first QR to use DLC coating on the valve lifter buckets for reduced friction. It produces 125 kW (170 PS; 168 hp) at 5600 rpm and 245 N⋅m (181 lb⋅ft) at 4000 rpm.[1]
Vehicle applications:
The QR25DER is similar to the QR25DE but has a supercharger for increased power and is coupled with a 15 kW (20 hp) electric motor, Dual Clutch System, and lithium-ion battery for increased fuel efficiency. The engine has a compression ratio of 9.1:1 (10.0:1 in 2014 Infiniti QX70[4]) and produces a combined 250 hp (186 kW; 253 PS) at 5600 rpm and 243 lb⋅ft (329 N⋅m) at 3600 rpm.[5]
Vehicle applications:
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