posted on January 16, 2009 20:17
Besides the obviously higher displacement, what really changed from the VQ35HR to the VQ37VHR engines?
Nissan improved upon the VQ35HR engine in order to produce more power, cleaner emissions, and greater fuel efficiency. Approximately 35% of the VQ37VHR engine components are newly developed technology, from the revised cylinder head and increased height of the cylinder blocks to the VVEL operation as well as a wider phase CVTC on the intake side. The VQ37VHR also has higher flow exhaust ports, equal length exhaust manifold, longer connecting rods, and greater compression ratio (11:0 versus 10.6:1 in the VQ35HR). Nissan also enlarged the diameter of the crank journal and crankpin, enhanced the durability of the upper and lower oil pans, chain and rocker covers, and valve springs, and revised the oil pump rotor. It is equipped with twin knock sensor, a sound insulating engine cover, symmetric twin intake system, and high flow intake manifold and resin collector. The VQ37VHR offers about 330 horsepower and 270 lb-ft of torque, an improvement over the VQ35HR's 306 horsepower and 268 lb-ft of torque.
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