Nissan QR engine

QR25DE

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

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

Vehicle applications:

• 2001-2007 Nissan X-Trail T30 (140 hp)
• 2001-2007 Nissan Primera P12
• 2002-present Nissan Serena C24, 145 hp (108 kW)
• 2003-2008 Nissan Teana J31, 145 hp (108 kW)
• 2001-2005 Nissan Wingroad Y11
• 2002-2005 Nissan Avenir W11
• 2001-2004 Nissan Prairie M12

QR20DD

The QR20DD is similar to the QR20DE but features NEO direct injection to improve fuel economy and to reduce emissions.[2] It produces 150 hp (110 kW).

Vehicle applications:

• 2000-2004 Nissan Bluebird Sylphy

QR25DE

The QR25DE is a 2.5 L (2488 cc) variant built in Decherd, TN 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 of 9.5:1.[3] Output is rated 175 hp (130 kW) at 6000 rpm with 180 ft·lbf (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 ft·lbf (237 N·m) of torque.[4] In the 2005+ Nissan Frontier the QR25DE generates 154 hp (115 kW) and 173 ft·lbf (235 N·m) of torque.[5] More recently, in the Nissan SE-R Spec V 2007+ the QR25DE generates 200 hp (150 kW) @ 6600 rpm and 180 ft·lbf (240 N·m) of torque @ 5200 rpm with a 7000 rpm redline. The crankshaft comes fully balanced allowing removal of the counter-shafts built into the older style QR25. The newer version is also equipped with a composite intake manifold and compression has been bumped up to 10.5:1[6]

Vehicle applications:

• 2002-2006 Nissan Sentra SE-R 165hp & SE-R Spec V 175hp
• 2007-present Nissan Sentra SE-R 175hp & SE-R Spec V 200hp
• 2002-present Nissan Altima 2.5, 2.5S, 2.5SL 175hp, Hybrid 158hp
• 2001-present Nissan Serena C24, 158 hp (118 kW)
• 1999-2003 Nissan Bassara
• 2001-2007 Nissan X-Trail T30 APEC export version, 178 hp (133 kW)
• 2005-present Nissan Frontier King Cab XE 4x2 154hp
• 2003-2005 Nissan Teana 160 hp (120 kW) and 240 nm
• 2008-present Nissan Rogue 170 hp (130 kW)
• 2007-present Nissan X-Trail T31 169 hp (126 kW)
• 2009-present Suzuki Equator Extended Cab 4x2 152hp
• 2002-2009 Nissan Presage

Concerns

Manufacturing, design, and assembly flaws

The QR25DE sold in the United States has been subject to a significant number of problems in its lifetime. A variety of mechanical flaws have led to numerous technical service bulletins, recalls, repairs, and outright engine replacements.

• Vehicles with the QR25DE may ingest material from a damaged pre-catalyst resulting in increased oil consumption.[7]
• Power valve screws in the intake manifold may become loose and result in unstable idling or power loss.[8]
• In June 2006, it came to Nissan's attention that approximately 85,000 Altimas and 2,000 Sentra SE-Rs equipped with the QR25DE and built between January and May 2006 may experience unusually high oil consumption. This can lead to premature engine failure and possibly a fire. While Nissan investigates the problem, owners of the affected vehicles are being advised to check their oil frequently (every 700 mi (1,100 km) [1127 km]), and dealers have been instructed to place the affected vehicles on sales hold.[9]
• The revised QR25DE found in the 2007+ Sentras, Altimas, etc. may have the above issues fixed.

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. No more troublesome butterfly valves. (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 central location in the block. This also means JWT's balance shaft removal kit for the 1st gen QR will not work.
• Revised cam shaft profile.
• Reinforced connecting rods.
• 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.
• Oil consumption issue resolved from older QR25DE.
• Higher rev limit and improved power output.

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 ft·lbf (245 N·m).[10]

Vehicle applications:

• 2002-2006 Nissan Primera P12 (JDM)

See also

• List of Nissan engines

References

• "2007 Nissan Altima overview"
• "2007 Nissan Altima specifications"
• "2006 Nissan Altima specifications"
• "2006 Nissan Frontier specifications
• "2006 Nissan Sentra specifications"
• "Global Vehicles", by Jack Yamaguchi, "Automotive Engineering International", June 2001, retrieved June 29, 2006
• "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

Enthusiast Websites

• "B15U.com - A Nissan Sentra Forum"
• "B15sentra.net - Another Nissan Forum for both B15 and B16 Sentras."
• "AllSentra.com - A Forum for all Sentras"