The QR family of inline-four

piston engine A reciprocating engine, more often known as a piston engine, is a heat engine that uses one or more Reciprocating motion, reciprocating pistons to convert high temperature and high pressure into a Circular motion, rotating motion. This article ...

s by Nissan were introduced in 2000 and range from in displacement. These motors are aluminum, dual overhead camshaft (

DOHC An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combus ...

), four-valve designs with

variable valve timing Variable valve timing (VVT) is the process of altering the timing of a Poppet valve, valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combina ...

and optional direct injection. The engine shares much of its architecture with the YD diesel engine.

QR20DE

QR20DE The QR20DE produces at 6000 rpm and at 4000 rpm. The bore and stroke is and a

compression ratio The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine. A fundamental specification for such engines, it can be measured in two different ways. Th ...

of 9.9:1. The QR20DE was replaced with the MR20DE engine in most applications in early 2005. Vehicle applications: * 2001-2007

Nissan X-Trail The is a compact crossover SUV produced by the Japanese automaker Nissan since 2000. Since 2018, it is positioned between the Qashqai and the larger Murano. Since the third-generation model, the X-Trail became the same vehicle as the North ...

T30, * 2001-2007

Nissan Primera The is a Mid-size car, large family car which was produced by the Japanese automaker Nissan from 1990 to 2007, for the markets in Japan and Europe. In Japan, it replaced the Nissan Stanza, Auster/Stanza, and was exclusive to ''Nissan Motor Comp ...

P12 * 2002–present Nissan Serena C24, * 2003-2008 Nissan Teana J31, * 2001-2005 Nissan Wingroad Y11 * 2002-2005

Nissan Avenir The Nissan Avenir is a line of station wagons beginning production in May 1990 by Nissan of Japan, with the budget oriented delivery van starting out as the Avenir Cargo, then being renamed the Nissan Expert ( ja) in 1999. The Avenir replaced the lo ...

W11 * 2001-2004

Nissan Prairie The is an automobile manufactured and marketed by Nissan from 1981 to 2004. Considered a mini MPV or a compact MPV. It was also marketed as the Multi in Canada and the Stanza Wagon in the United States. In Japan, it was exclusive to '' Nissan Blu ...

M12 * 2007-2020 Nissan Atlas F24 * 2014-present

Nissan Urvan Urvan may refer to: * Nissan Urvan, a cargo van * ''urvan'', a concept of the soul in Zoroastrianism Zoroastrianism ( ), also called Mazdayasnā () or Beh-dīn (), is an Iranian religions, Iranian religion centred on the Avesta and the teac ...

E26

QR20DD

The QR20DD is similar to the QR20DE but features NEO direct injection to improve fuel economy and to reduce emission

It produces at 6000 rpm and at 4400 rpm. Vehicle applications: * 2000-2004 Nissan Bluebird Sylphy

QR25DE

The QR25DE is a variant built with cast steel connecting rods, a steel timing chain, counter-rotating

balance shaft Balance shafts are used in piston engines to reduce vibration by cancelling out unbalanced dynamic forces. The counter balance shafts have eccentric weights and rotate in the opposite direction to each other, which generates a net vertical force ...

s, and an aluminum intake manifold. The engine bore and stroke is and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle. Output is rated at 6000 rpm with of torque at 4000 rpm in the Altima 2.5 and Sentra SE-R models. The Sentra SE-R Spec V originally claimed 180 hp, but this was adjusted downward to 175 once production started in late 2001. The redline is 6100 rpm. Altimas that are

PZEV A partial zero-emission vehicle, in the United States, is an automobile that has zero evaporative emissions from its fuel system, has a 15-year (or at least 150,000-mile) warranty on its emission-control components, and meets SULEV tailpipe-emissio ...

compliant create and of torqu

In the 2005+ Nissan Frontier the QR25DE generates and of torqu

2007+ QR25DE

The revised QR25DE found in the 2007+ Sentra, Altima, Nissan Rogue, 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. * 1999–2003 Nissan Bassara * 2001–2005 Nissan Serena C24 * 2001–2007

T30 APEC export version * 2002–2006 Nissan Sentra SE-R & SE-R Spec V * 2002–2009

Nissan Presage The is a minivan produced by Japanese automaker Nissan from 1998 to 2009. The Presage was only officially sold by Nissan in Japan, Hong Kong and Singapore. The name "Presage" is French for "omen".Nissan Altima The Nissan Altima is a mid-size car manufactured by Nissan since 1992. It is a continuation of the Nissan Bluebird line, which began in 1955. The Altima has historically been larger, more powerful, and more luxurious than the Nissan Sentra b ...

to * 2003–2005 Nissan Teana * 2003–2014 Nissan Murano (Japan) * 2005–2019 Nissan Frontier * 2007–2012 Nissan Sentra SE-R & SE-R Spec V * 2007–2011

Nissan Altima The Nissan Altima is a mid-size car manufactured by Nissan since 1992. It is a continuation of the Nissan Bluebird line, which began in 1955. The Altima has historically been larger, more powerful, and more luxurious than the Nissan Sentra b ...

Hybrid , combined * 2007–2020

T31 * 2007–2023 Renault Koleos TR25 * 2008–2020 Nissan Rogue * 2009–2012

Suzuki Equator The Suzuki Equator was a mid-size pickup truck based on the Nissan Navara#D40, Nissan Frontier and assembled by Nissan. It was first sold in the US for the 2009 model year with MSRPs starting at $17,220, and made its debut at the Chicago Auto Sho ...

* 2010–present Nissan Elgrand E52 * 2013–2020 Nissan Teana * 2013–present

T32 * 2014-present

E26 * 2018–present Nissan Terra- * 2020–present Nissan X-Terra-

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 A tappet or valve lifter is a valve train component which converts rotational motion into linear motion in activating a poppet valve, valve. It is most commonly found in internal combustion engines, where it converts the rotational motion of the ...

buckets for reduced friction. It produces at 5600 rpm and at 4000 rpm. Vehicle applications: * 2002-2006

P12 (JDM)

QR25DER

The QR25DER is similar to the QR25DE but has a supercharger for increased power and is coupled with a electric motor, Dual Clutch System, and lithium-ion battery for increased

fuel efficiency Fuel efficiency (or fuel economy) is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical energy, chemical potential energy contained in a carrier (fuel) into kinetic energy or Mechanical work, w ...

. The engine has a compression ratio of 9.1:1 (10.0:1 in 2014 Infiniti QX70) and produces a combined at 5600 rpm and at 3600 rpm. Vehicle applications: * 2014 - 2015 Nissan Pathfinder Hybrid * 2016 only Nissan Murano Hybrid * 2014 - 2017 Infiniti QX60 Hybrid

References

General references

"2007 Nissan Altima overview"

"2007 Nissan Altima specifications"

"2006 Nissan Frontier specifications

"2006 Nissan Sentra specifications"

"NTB03070 Nissan technical service bulletin regarding engine precatalyst failure"

* [http://www.nissan-techinfo.com/nissan/TSB/TSB_xml/nmabstract.asp?mscssid=&VdocID=54792&phydoc=Y&FileName=1\R\Q\1RQ26.PDF&VRefNo=NTB05058 "NTB05058 Nissan technical service bulletin regarding power valve screws"]
"Technobabble: December 2001
by Dave Coleman, "SportCompactCar", December 2001, retrieved June 26, 2006

External links

"B15U.com - A Nissan Sentra Forum"

"B15sentra.net - Another Nissan Forum for both B15 and B16 Sentras."

"AllSentra.com - A Forum for all Sentras"
{{nissan QR Straight-four engines Gasoline engines by model