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Nissan Develops New-Generation V6 Engines; 10% Improvement in Fuel Efficiency
24 August 2006
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| 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.
August 24, 2006 in Engines, Fuel Efficiency | Permalink | Comments (29) | TrackBack (1)
Comments
Posted by: frito | August 24, 2006 at 04:19 PM
Apply this to smaller engines, say a 1.8->2.0L I4, or 2.0->2.3 I5 and you can push a 30-50mpg car to 33-55mpg. Add in hybrid tech and/or better CVT, and another 10-50% may be tacked on.
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FYI CO2,
GM has just announced a Tier2Bin4 and LEV2 diesel. Combine the low friction coating (and maybe asymmetrical piston skirt with lengthened connecting rod if feasible) with the 2009 Duramax, and you just made it better. Nissan/Renault may want the diesel tech cooperation. Thus a possible strategic synergy is on the horizon. They do not have to get into a intimate business relationship for this to happen. A joint diesel and gasoline engine production scheme, with the requisite tech transfers will do.
Posted by: allen Z | August 24, 2006 at 04:42 PM
dang it,
Tier2 Bin5 and LEV 2
Posted by: allen Z | August 24, 2006 at 04:44 PM
The V6 is Nissan's main engine for the US. The 10% improvement would be for more then half their US sales. That in one year is a big deal in itself. Hopefully they will add other technologies for fuel savings in the future as well.
This engine is in the 350Z now. The improved version on the manual should take it from 19/25 mpg to 21/27.5 which is not bad for that sports car.
Posted by: hampden wireless | August 24, 2006 at 05:19 PM
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Tracked on Aug 27, 2006 6:29:09 PM
FYI CO2 the more you talk the dumber you sound. Keep talking and check you spelling.