Nissan QR engine

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.

QR engine
A Nissan QR25DE Engine
Overview
ManufacturerNissan (Nissan Machinery)
Production2000–present
Layout
ConfigurationInline-four
Displacement2.0–2.5 L (1,998–2,488 cc)
Cylinder bore89 mm (3.5 in)
Piston stroke80.3 mm (3.16 in)
100 mm (3.94 in)
Block materialAluminum
Head materialAluminum
ValvetrainDOHC 4 valves x cyl. with VVT
Compression ratio9.1:1-10.5:1
Combustion
SuperchargerOn QR25DER only
Fuel systemDirect injection
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output140–250 hp (104–186 kW; 142–253 PS)
Torque output200–330 N⋅m (148–243 lb⋅ft)
Chronology
PredecessorNissan SR engine
Nissan KA engine

QR20DE
QR20DE

The 2.0 L (1,998 cc) QR20DE produces 150 PS (110 kW; 148 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.

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 PS (110 kW; 148 hp) at 6000 rpm and 200 N⋅m (148 lb⋅ft) at 4400 rpm.[1]

Vehicle applications:

  • 2000-2004 Nissan Bluebird Sylphy

QR25DE
Nissan QR25DE Engine

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. 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.

2007+ QR25DE

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

  • A simpler, larger diameter single path resin intake manifold replaced the old dual path design. (Note: California emissions models do have a swirl control valve located in the intake)
  • Revised piston crown shape to support a higher compression ratio of 9.6:1.(10.5:1 in Sentra SE-R Spec V.)
  • The balancer system has been moved back slightly from the crank pulley to a more centric location in the block.
  • Revised cam shaft profile.
  • Reinforced connecting rods only available in the Sentra SE-R Spec V 2007-2012 .
  • Reduced friction likely through Nissan's extensive use of coatings on pistons, journal bearings, etc.
  • Additional engine mount on the top of the motor, pulley side.
  • Higher rev limit and improved power output.
Vehicle applications:
  • 1999–2003 Nissan Bassara- 165 hp (123 kW; 167 PS)
  • 2001–2005 Nissan Serena C24- 158 hp (118 kW; 160 PS)
  • 2001–2007 Nissan X-Trail T30 APEC export version- 178 hp (133 kW; 180 PS)
  • 2002–2006 Nissan Sentra SE-R- 165 hp (123 kW; 167 PS) & SE-R Spec V- 175 hp (130 kW; 177 PS)
  • 2002–2009 Nissan Presage- 165 hp (123 kW; 167 PS)
  • 2002–present Nissan Altima 170 hp (127 kW; 172 PS) to 182 hp (136 kW; 185 PS)
  • 2003–2005 Nissan Teana- 160 hp (119 kW; 162 PS)
  • 2003–present Nissan Murano (Japan)
  • 2005–present Nissan Frontier- 152 hp (113 kW; 154 PS)
  • 2007–2012 Nissan Sentra SE-R- 177 hp (132 kW; 179 PS) & SE-R Spec V- 200 hp (149 kW; 203 PS)
  • 2007–2011 Nissan Altima Hybrid 158 hp (118 kW; 160 PS), combined 198 hp (148 kW; 201 PS)
  • 2007–present Nissan X-Trail T31- 169 hp (126 kW; 171 PS)
  • 2007–present Renault Koleos TR25- 169 hp (126 kW; 171 PS)
  • 2008–present Nissan Rogue- 170 hp (127 kW; 172 PS)
  • 2009–2012 Suzuki Equator- 152 hp (113 kW; 154 PS)
  • 2013–present Nissan Teana- 165 hp (123 kW; 167 PS)
  • 2013–present Nissan X-Trail T32- 169 hp (126 kW; 171 PS)
  • 2010-present Nissan Elgrand E52
  • 2018–present Nissan Terra- 180 hp (134 kW; 182 PS)

QR25DD

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:

QR25DER

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 and produces a combined 250 hp (186 kW; 253 PS) at 5600 rpm and 243 lb⋅ft (329 N⋅m) at 3600 rpm.[3]

Vehicle applications:

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See also

References
  1. Yamaguchi, Jack. "Two midsize Nissans for Japan and Europe". SAE International. Archived from the original on 2004-06-25.
  2. nissannews.com
  3. 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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