Jump to content

Nissan QR engine: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
Line 46: Line 46:
*Vehicles with the QR25DE may ingest material from a damaged pre-catalyst resulting in increased oil consumption.[http://www.nissan-techinfo.com/nissan/TSB/TSB_xml/nmabstract.asp?mscssid=&VdocID=54354&phydoc=Y&FileName=1\R\F\1RF28.PDF&VRefNo=NTB03070]
*Vehicles with the QR25DE may ingest material from a damaged pre-catalyst resulting in increased oil consumption.[http://www.nissan-techinfo.com/nissan/TSB/TSB_xml/nmabstract.asp?mscssid=&VdocID=54354&phydoc=Y&FileName=1\R\F\1RF28.PDF&VRefNo=NTB03070]
*Power valve screws in the intake manifold may become loose and result in unstable idling or power loss.[http://www.nissan-techinfo.com/nissan/TSB/TSB_xml/nmabstract.asp?mscssid=&VdocID=54792&phydoc=Y&FileName=1\R\Q\1RQ26.PDF&VRefNo=NTB05058]
*Power valve screws in the intake manifold may become loose and result in unstable idling or power loss.[http://www.nissan-techinfo.com/nissan/TSB/TSB_xml/nmabstract.asp?mscssid=&VdocID=54792&phydoc=Y&FileName=1\R\Q\1RQ26.PDF&VRefNo=NTB05058]
*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 could have led to premature engine failure and possibly a fire. The issue was resolved by reprogramming the ECM [http://www.nissanextendedwarranty.com/recalls/recalls.html?year=2006&make=NISSAN&model=ALTIMA&submit=Submit]
*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 could have led to premature engine failure. The issue was resolved by reprogramming the ECM [http://www.nissanextendedwarranty.com/recalls/recalls.html?year=2006&make=NISSAN&model=ALTIMA&submit=Submit]


===2007+ QR25DE===
===2007+ QR25DE===

Revision as of 14:49, 1 March 2012

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 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.[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.[2] It produces 150 hp (110 kW).

Vehicle applications:

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 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.[4] In the 2005+ Nissan Frontier the QR25DE generates 154 hp (115 kW) and 173 lb⋅ft (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 lb⋅ft (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:


Technical service bulletins

  • 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 could have led to premature engine failure. The issue was resolved by reprogramming the ECM [9]

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.
  • 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 lb·ft (245 N·m).[10]

Vehicle applications:

See also

References

Retrieved from "https://en.wikipedia.org/w/index.php?title=Nissan_QR_engine&oldid=479657896"