The VQ-series V6, which has been named one of the “Ten Best Engines” by Ward’s Auto World magazine for 12 consecutive years, now moves into its fourth generation and has been significantly rethought, with approximately 80% of major parts (except bolts, O-rings and clips) redesigned. The block features ladder frame construction for greater rigidity, crank journal and pin diameters have been increased, the block height increased by 8.4 millimeters to reduce piston side force and the engine center is now 15 millimeters lower, which also contributes to the G’s improved dynamic performance.
Other engine enhancements include the addition of standard variable exhaust cam timing (eCVTCS), a higher rev limit (increased from 6,600 rpm to 7,500 rpm) and higher compression ratio (10.6:1 versus the previous 10.3:1), asymmetric piston skirts, twin knock sensors, improved coolant flow and new Iridium spark plugs.
A new symmetric twin ram air intake system helps reduce airflow resistance by 18% and a new exhaust system design with equal length exhaust manifolds and reduced muffler exhaust pressure (25% less than the first generation G35) help improve engine breathing. Both are tuned to create authoritative harmonies, helping enhance driving pleasure.
The result of all these changes is an estimated 300-plus horsepower and a powerful torque curve (final horsepower and torque figures will be released at a later date), an exciting engine sound and expected improvements in emissions and fuel economy.
The new VQ engine design also includes a long list of advanced systems found on the previous design – including a continuously variable valve timing control system, a “noiseless” timing chain for quiet operation, an electronically controlled “drive-by-wire” throttle system, microfinished crank journals and cam lobes, and molybdenum coated lightweight pistons.
Hmm… asymmetric piston skirts? I wonder what that’s for… Maximum strength for secondary piston motion yet minimum friction maybe? Like maybe the piston tends to rotate one way on the way up and another way on the way down? Interesting…
The stout bed plate block holds’ the crank in this stout cage. This should take over 1000 hp no sweat.
I wonder if Don will agree with that one?
The HR engine will be the workhorse engine for the Z in the near future but even better stuff may be coming later. It is a strong, nearly confirmed rumor that the engine used in the upcoming super secret Skyline GT-R will use a twin turbo 3.7 liter version of the HR motor topped with some secret cylinder heads developed by none other than Cosworth. The new Cosworth heads will also feature Nissans VVL technology where lift, duration, lobe centers and advance can be controlled by the engines ECU, much like Honda’s I-VTEC system. The turbos will be smog friendly using Cosworth technology that bypasses the turbos during cold start.
and finally…
This looks like an old school VG or SR rod. Nissan beef is back. The rod has lots of material and is strong. It should probably be able to take 600 hp stock. See the thick parting line down the middle of the beam? This indicates that its forged or PM, not cast like NICO says.
