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Thought this was interesting, its regarding the maxima VQ35DE.
From Nissan Performance Mag,
What are the differences between the VQ30DE and VQ35DE? Thanks, Will.
Nissan continues to improve upon their engines as the VQ35DE replaces the VQ30DE in the Maxima (and powers the 350Z). The VQ35DE was designed for even more low end torque. Displacement was increased from 3.0L to 3.5L using a longer 95.5mm bore (the size of your piston) and 81.4mm stroke (how far the piston travels up and down) versus the 93 x 73.3mm bore x stroke in the VQ30DE. The Maxima’s variable intake system and new valve timing control system, NCVCS (Nissan Continuous Valve Timing Control System), improves volumetric efficiency through optimal timing control proportionate to engine speed and intake manifold length, increasing torque 9% at 2000 rpm and an additional 3% at 3200 rpm. An internal valve system which adjusts intake length relative to engine speed, NVIS (Nissan Variable Intake System), boosts horsepower and torque (roughly 11% at low engine speeds). Internal components went on a diet lowering the inertia mass and reducing friction of reciprocating parts to get quicker engine response and a quieter ride. Lighter pistons were designed to include a reduced skirt length, reduced pin offset, lower skirt rigidity, and a tapered pin boss making them the lightest in the world for their size. The engine’s connecting rods are fastened by bolts only, to reduce reciprocating weight. A new long reach spark plug design improves cooling performance by increasing the water jacket around the plugs, which strengthen knock resistance and allowed the ignition timing to be advanced. The VQ35DE block weighs in at 35 pounds lighter than its predecessor. In the end, horsepower jumps to 250hp@6000rpm (240hp in the auto) and 240 ft lbs of torque@3200rpm (265 in auto) while the VQ30DE is rated at 190hp@5600rpm and 205 ft lbs@4000 rpm (222hp@6400rpm and 217ft lbs@4000rpm in the 2000+ VQ30DE-K’s). Nissan Motorsports just released a new head which has the VQ30DE chamber volume but the VQ35DE ports and titanium valves which raises the compression ratio to 12:1 if you’re interested in building a naturally aspirated Maxima.