Nissan QR engine
This article includes a list of general references, but it remains largely unverified because it lacks sufficient corresponding inline citations. (March 2019) (Learn how and when to remove this template message)
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.
A Nissan QR25DE Engine
|Manufacturer||Nissan (Nissan Machinery)|
|Displacement||2.0–2.5 L (1,998–2,488 cc)|
|Cylinder bore||89 mm (3.5 in)|
|Piston stroke||80.3 mm (3.16 in)|
100 mm (3.94 in)
|Valvetrain||DOHC 4 valves x cyl. with VVT|
|Supercharger||On QR25DER only|
|Fuel system||Port Fuel Injection or Direct Fuel Injection|
|Power output||140–250 hp (104–186 kW; 142–253 PS)|
|Torque output||200–330 N⋅m (148–243 lb⋅ft)|
|Predecessor||Nissan SR engine|
Nissan KA engine
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. The QR20DE was replaced with the MR20DE.
- 2001-2007 Nissan X-Trail T30 140 hp (104 kW; 142 PS)
- 2001-2007 Nissan Primera P12
- 2002–present Nissan Serena C24, 145 hp (108 kW; 147 PS)
- 2003-2008 Nissan Teana Sentra in U.S J31, 145 hp (108 kW; 147 PS)
- 2001-2005 Nissan Wingroad Y11
- 2002-2005 Nissan Avenir W11
- 2001-2004 Nissan Prairie M12
- 2007-present Nissan Atlas F24
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.
- 2000-2004 Nissan Bluebird Sylphy
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.
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.
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.
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.
- 2002-2006 Nissan Primera P12 (JDM)
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.
This article has an unclear citation style.August 2020) (Learn how and when to remove this template message)(
- Yamaguchi, Jack. "Two midsize Nissans for Japan and Europe". SAE International. Archived from the original on 2004-06-25.
- "2007 Nissan Altima overview"
- "2007 Nissan Altima specifications"
- "2006 Nissan Altima specifications"
- "2006 Nissan Frontier specifications
- "2006 Nissan Sentra specifications"
- "NTB03070 Nissan technical service bulletin regarding engine precatalyst failure"
- "NTB06045 Nissan technical service bulletin regarding low oil levels"
- "NTB05058 Nissan technical service bulletin regarding power valve screws"
- "Road Test: 2002 Nissan Sentra SE-R" by Josh Jacquot, "SportCompactCar", December 2001, retrieved June 26, 2006
- "Technobabble: December 2001 by Dave Coleman, "SportCompactCar", December 2001, retrieved June 26, 2006