Infiniti VQ35HR engineInfiniti VQ35HR V6Nissan has revealed details about its next-gen V6 engines, which will first appear in the 2007 Nissan Skyline / Infiniti G35.

The 3.5L VQ35HR and 2.5L VQ25HR feature new blocks and a host of new key components. The highlights of the engines' improvements are a 7,500 RPM redline (up from 6,600 on the previous-gen VQ), a 10% increase in fuel economy, and a SULEV emissions rating.

The VQ35HR (pictured at right), as applied in the '07 G35, will be good for over 300 horsepower, but Nissan has yet to divulge an exact number. In Japan, the '07 Nissan Skyline will be available with both the 2.5L and 3.5L engines, as was previously the case. The last-gen VQ25 made 210 horsepower -- a number that will undoubtedly go up with the introduction of the VQ25HR. There are currently no known plans to use the 2.5L V6 in North America.

Key specs of the new VQs are listed in the press release after the jump, and Nissan also released audio of what the VQ35HR sounds like, which you can stream by clicking here.

The release of the details surrounding the new powerplants has prompted enthusiastic discussion over at the FreshAlloy.com forums, where Nissan/Infiniti fans have also posted some X-Ray-type shots of the 2007 G35/Skyline's new intake and exhaust systems.

Thanks Jason for the tip!

(Press release after the jump)

[Source: Nissan via FreshAlloy.com forums]



NISSAN DEVELOPS NEW-GENERATION V6 ENGINES
--Engines to power all-new Skyline to be released this autumn--

TOKYO (Aug. 22, 2006)--Nissan Motor Co., Ltd., has newly developed two new-generation six-cylinder V-type engines for front-engine, rear-wheel-drive vehicles featuring powerful performance and improved environmental friendliness.

The 3.5L VQ35HR and 2.5L VQ25HR engines will be built at Nissan's Iwaki Plant in Fukushima Prefecture and will be equipped in the all-new Skyline to be released this autumn in Japan, as well as the US where the model is sold as the Infiniti G35.

Featuring newly designed engine blocks and other key components, the engines offer smooth transition to top-in-class level engine speed of 7,500 revolutions per minute drawing upon the "smooth transition" concept of the popular VQ engine, the only engine in the world to appear on Ward's 10-Best Engines list for 12 consecutive years.

The engines achieve a 10% improvement in fuel efficiency compared to vehicles equipped with the existing VQ engine and top-in-class Super Ultra-Low Emission Vehicle level emissions. SU-LEVs have 75% or less nitrogen oxide (NOx) and hydrocarbon (HC) emissions than those stipulated by Japan's 2005 exhaust emission standards.

The letters "HR" in VQ35HR and VQ25HR stand for "high revolution" and "high response."

Nissan began VQ engine production in 1994 and has produced a cumulative total of 5.5 million units as of last fiscal year, ended March 31, 2006.

Main specifications of the VQ35HR and VQ25HR engines:

Smooth transition to top-in-class level engine speed of 7,500 rpm

* Reduction of weight and friction through adoption of asymetrical piston skirt configuration
* Reduction of piston-side force through lengthening of con rod
* Addition of rudder frame, newly-designed cylinder block with significantly improved rigidity

Thrilling revving sound and top-in-class output

* Adoption of perfectly symmetrical intake system
* Adoption of continuously variable valve timing control (CVTC) for intake side and electromagnetic valve timing control (e-VTC) for exhaust side
* Reduction of intake resistance through adoption of symmetrical twin intake system and straight intake port
* Adoption of isometric exhaust manifold and perfectly symmetrical exhaust system

Improvement of fuel-efficiency and emission cleanliness

* Reduction of friction through adoption of world's first hydrogen-free, diamond-like carbon (DLC) coating
* Adoption of catalyst substrate with ultra-low heat mass, super-ignition iridium spark plug and fast light-off O2 sensor control