Nissan QR engine

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Template:Insufficient inline citationsTemplate:Infobox automobile engine

The QR family of inline-four piston engines by Nissan were introduced in 2000 and range from Template:Convert 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.

QR20DE

File:Nissan QR20DE Motor.JPG
QR20DE

The Template:Convert QR20DE produces Template:Convert at 6000 rpm and Template:Convert at 4000 rpm. The bore and stroke is Template:Convert and a compression ratio of 9.9:1.[1] The QR20DE was replaced with the MR20DE engine in most applications in early 2005.

Vehicle applications:

QR20DD

The QR20DD is similar to the QR20DE but features NEO direct injection to improve fuel economy and to reduce emissions.[1] It produces Template:Convert at 6000 rpm and Template:Convert at 4400 rpm.[1]

Vehicle applications:

QR25DE

File:2001 Nissan QR25DE engine left.jpg
Nissan QR25DE Engine

The QR25DE is a Template:Convert 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 Template:Convert and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle.[2]

Output is rated Template:Cvt at 6000 rpm with Template:Convert 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.[3] The redline is 6100 rpm.[3] Altimas that are PZEV compliant create Template:Convert and Template:Convert of torque.[2] In the 2005+ Nissan Frontier the QR25DE generates Template:Convert and Template:Convert of torque.[3]

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.

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Vehicle applications:

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 Template:Convert at 5600 rpm and Template:Convert 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 Template:Convert electric motor, Dual Clutch System, and lithium-ion battery for increased fuel efficiency. The engine has a compression ratio of 9.1:1 (10.0:1 in 2014 Infiniti QX70[4]) and produces a combined Template:Cvt at 5600 rpm and Template:Convert at 3600 rpm.[5]

Vehicle applications:

See also

References

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General references

External links

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  1. ↑ a b c Script error: No such module "citation/CS1".
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  3. ↑ a b Template:Cite magazine
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  5. ↑ Script error: No such module "citation/CS1".
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