| Nissan QR engine | |
| Manufacturer: | Nissan (Nissan Machinery) |
| Production: | 2000 - present |
| Configuration: | Inline-four |
| Valvetrain: | DOHC 4 valves x cyl. with VVT |
| Block: | Aluminum |
| Head: | Aluminum |
| Predecessor: | Nissan SR engine Nissan KA engine |
| Fueltype: | Gasoline |
| Fuelsystem: | Port Fuel Injection or Direct Fuel Injection |
| Coolingsystem: | Water-cooled |
| Displacement: | |
| Bore: | 89mm |
| Stroke: | 80.3mm 100mm |
| Compression: | 9.1:1-10.5:1 |
| Supercharger: | On QR25DER only |
The QR family of inline-four piston engines by Nissan were introduced in 2000 and range from 1998to 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.
thumb|QR20DE
The 1998cc QR20DE produces 1400NaN0 at 6000 rpm and 2000NaN0 at 4000 rpm. The bore and stroke is NaNmm 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.https://web.archive.org/web/20060114194812/http://www.nissan-global.com/GCC/Japan/NEWS/20000727_0e.html It produces 1500NaN0 at 6000 rpm and 2000NaN0 at 4400 rpm.[1]
Vehicle applications:
The QR25DE is a 2488cc 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 NaNmm and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle.[2]
Output is rated at 6000 rpm with 2440NaN0 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 1700NaN0 and 1750NaN0 of torque.http://www.nissannews.com/nissan/2006vehicles/sentra/specs.shtml In the 2005+ Nissan Frontier the QR25DE generates 1520NaN0 and 1710NaN0 of torque.http://www.nissannews.com/nissan/2006vehicles/frontier/specs.shtml
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 1250NaN0 at 5600 rpm and 2450NaN0 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 15kW 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) and produces a combined at 5600 rpm and 2430NaN0 at 3600 rpm.[4]
Vehicle applications: