Wednesday, December 31st, 1969
Filed under: Trends, Etc., Tech
Mechanically actuated valves may soon be a thing of the past. We’ve made over a century’s worth of improvement on the same basic combination of a camshaft, followers (or lifters), a poppet valve and a spring. We’ve gone from using pushrods and rocker arms to actuate the valvetrain to direct-acting buckets motivated by an overhead camshaft with variable phasing and lift. While engineering ingenuity has managed to wring incredible performance and flexibility out of these setups, there’s only so far you can go before bumping into the laws of physics. French automotive supplier Valeo SA has been working on camless engine technology for quite some time and they expect to have their system on the street by 2010 or 2011. Valeo is working with several automakers to implement the camless technology. Eliminating a traditional valvetrain is expected to yield efficiency improvements nearing 20 percent. An increase in performance and emissions decreases will also be realized from the system.
More after the jump
[Source: Valeo via Autoweek]
Continue reading Behold the cam-less future
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Posted in Uncategorized, Electronics, tech, camshafts, cylinder head, CylinderHead, engine electronics, engine management, engine technology, EngineElectronics, engineering, EngineManagement, EngineTechnology, mechanical, motor, motor technology, MotorTechnology, overhead cam, OverheadCam, valves, valvetrain | No Comments »
Wednesday, December 31st, 1969
Filed under: New York Auto Show, Green, Tech, Infiniti, Nissan
Ever-tightening emissions requirements, teamed with consumers’ lust for today’s high horsepower numbers, have led to some creative valve timing and lift schemes. Infiniti’s G37 will be pack some interesting tech underhood when it debuts at the upcoming New York International Auto Show. There are actually two new developments working in conjunction to give independent control over valve timing and lift. Nissan has dubbed the control technologies Variable Valve Event and Lift and Continuous Valve Timing control, or VVEL and C-VTC, respectively. VVEL uses a clever arrangement of links to actuate the valves, and moves the fulcrum for the links via a seperate shaft actuated by a DC motor. By moving the fulcrum, the valve lift is varied.
More after the jump, along with press release
[Source: Nissan via Gizmag]
Continue reading New York Preview: Nissan to introduce new variable valve timing tech
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BOLD MOVES: THE FUTURE OF FORD A new documentary series. Be part of the transformation as it happens in real-time
Read the rest of this entry »
Posted in Uncategorized, Technology, Nissan, Infiniti, engine management, EngineManagement, show, performance, auto, new york, NewYork, engine, auto show, emissions, green, AutoShow, control, G37, lift, management, timing, valve, valve lift, valve timing, ValveLift, ValveTiming, variable, variable lift, variable valve timing, VariableLift, VariableValveTiming | No Comments »