|Nissan’s new 3.5-liter V6.|
Nissan Motor has developed two new-generation six-cylinder V-type gasoline engines for front-engine, rear-wheel-drive vehicles.
The 3.5-liter VQ35HR and 2.5-liter VQ25HR engines offer a 10% improvement in fuel efficiency compared to vehicles equipped with the existing VQ engine as well as Super Ultra-Low Emission Vehicle (Japan) emissions. SULEVs have 75% or less NOx and hydrocarbon (HC) emissions than those stipulated by Japan’s 2005 exhaust emission standards.
Nissan will build the engines in its Iwaki Plant in Fukushima Prefecture and will apply them 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.
Improved fuel economy comes partly from reduced friction—the cylinders use the world’s first hydrogen-free, diamond-like carbon coating, according to Nissan. Adoption of a catalyst substrate with ultra-low heat mass, use of iridium spark plugs, and a fast light-off O2 sensors control contribute to the SULEV emissions rating.
The engines feature a top speed of 7,500 rpm. Nissan reduced weight and friction through the use of an asymmetrical piston skirt configuration. Lengthening the connecting rod reduces the piston side force. And a rudder-frame, newly designed cylinder block provides improved rigidity.
The engines use continuously variable valve timing control (CVTC) for intake side and electromagnetic valve timing control (e-VTC) for exhaust side.