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
- Dan Roth
- Dec 22, 2006
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 fa
- Mike Magda
- Sep 26, 2006
One of the main hurdles facing diesel engineers is developing a real-time sensor to help the vehicle's on-board computer with fuel delivery timing. Through computer modeling and other research, engineers know there's a very small window in the combustion cycle that produces optimum power with hardly any harmful emissions. But this window of opportunity moves around depending on cylinder pressure.
- Eric Bryant
- Jun 1, 2006
As if rollovers, suicidal deer, and thieves who break in with laptop computers weren't enough to worry about, now there's a new menace on the roadways - high-energy neutrons from cosmic rays.
- Cars that are the most likely to be in accidents
- Why you should consider a certified used car
- Find and compare 2017 Models