Nissan QR engine

Nissan QR engine
Overview
Manufacturer Nissan Motor Company
Production 2000–Present
Combustion chamber
Configuration Inline Four Cylinder
Displacement 2.0L
2.5L
Valvetrain DOHC
Chronology
Predecessor Nissan SR engine
Nissan KA engine


The QR family of straight-4 piston engines by Nissan were introduced in 2000 and range from 2.0 L to 2.5 L in displacement. These motors are aluminum, dual overhead camshaft (DOHC), four-valve designs with variable valve timing and optional direct injection.

QR20DE

QR20DE

The 2.0 L (1998 cc) QR20DE produces 147 hp (110 kW) and 148 lb·ft (200 N·m) The bore is 89 mm with a stroke of 80.3 mm and a compression ratio of 9.9:1. The QR20DE was replaced with the MR20DE.

Vehicle applications:

QR20DD

The QR20DD is similar to the QR20DE but features NEO direct injection to improve fuel economy and to reduce emissions. It produces 150 hp (110 kW).

Vehicle applications:

QR25DE

QR25DE

The QR25DE is a 2.5 L (2488 cc) variant built with cast steel connecting rods, a steel timing chain, counter-rotating balance shafts, and an aluminum intake manifold. The engine bore is 89 mm with a stroke of 100 mm and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle.[1]

Output is rated 175 hp (130 kW) at 6000 rpm with 180 lb·ft (244 N·m) of torque at 4000 rpm in the Altima 2.5 and Sentra SE-R models. Altimas that are PZEV compliant create 170 hp (130 kW) and 175 lb·ft (237 N·m) of torque. In the 2005+ Nissan Frontier the QR25DE generates 152 hp (113 kW) and 171 lb·ft (232 N·m) of torque.

Vehicle applications:

2007+ QR25DE

The revised QR25DE found in the 2007+ Sentra, Altima, Rogue, etc. has a number of improvements over the older QR25DE. These include:

QR25DD

The QR25DD is similar to the QR25DE but increases the compression ratio to 10.5:1 and includes direct injection. It produces 170 hp (125 kW) and 181 lb·ft (245 N·m).

Vehicle applications:

QR25DER

The QR25DER is similar to the QR25DE but has a supercharger for increased power and is coupled with a 15 kW electric motor, Dual Clutch System, and lithium-ion battery for increased fuel efficiency. The engine has a compression ratio of 9.1:1 and produces a combined 250 hp (190 kW) at 5600 rpm and 243 lb·ft (329 N·m) at 3600 rpm. [2]

Vehicle applications:

See also

References

  1. ↑ nissannews.com
  2. ↑ http://nissannews.com/en-CA/nissan/canada/presskits/ca-2014-nissan-pathfinder-hybrid/releases/2014-nissan-pathfinder-hybrid-key-dimensions-and-specifications-2
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