Nissan QR engine


The QR family of inline-four piston engines by Nissan were introduced in 2000 and range from in displacement. These motors are aluminum, dual overhead camshaft, four-valve designs with variable valve timing and optional direct injection. The engine shares much of its architecture with the YD diesel engine.

QR20DE

The QR20DE produces at 6000 rpm and at 4000 rpm. The bore and stroke is and a compression ratio of 9.9:1. The QR20DE was replaced with the MR20DE.
Vehicle applications:
The QR20DD is similar to the QR20DE but features NEO direct injection to improve fuel economy and to reduce emissions. It produces at 6000 rpm and at 4400 rpm.
Vehicle applications:
The QR25DE is a 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 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. Altimas that are PZEV compliant create and of torque. In the 2005+ Nissan Frontier the QR25DE generates and of torque.

2007+ QR25DE

The revised QR25DE found in the 2007+ Sentra, Altima, Rogue, etc. has a number of improvements over the older QR25DE. These include:
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 at 5600 rpm and at 4000 rpm.
Vehicle applications:
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. The engine has a compression ratio of 9.1:1 and produces a combined at 5600 rpm and at 3600 rpm.
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