One of the more promising strategies is to have the valves at the halfway position when at rest. This has a few benefits:
- avoids interference issues in the event of loss of power
- reduces amount of power required to move the valve to full-open or full-closed position
- reduces the size of spring required (springs would likely still be necessary to help with a 'soft landing' and give the valve a push-off in the opposite direction)

 

I think my Clutch is made by valeo

Whatever happened to those valveless heads in Hot Rod several years back?

 

yes, but will they try to guess my mood???

oh yeah?? what about the A/C, the power steering, the water pump, the oil pump, and the GIGA-amp alternator required to operate this thing? I know they're going to try and push for a 42-volt standard to make current generation in the required capacities feasible but it's still not going to be "free". far, far, far from it. considering all that the net benefit after all this work and engineering seems dubious. especially when long-term reliability is unknown.

besides, this thing will have to rely on software, and implemented software (not the actual theory behind it), is art, not science. Prius owners having to reboot is a prime example of software in action. only there's no "rebooting" for a camless interference engine...

 

Guys said the same thing when computer controlled fuel injection came on the scene. Every new technology has its detractors. Every new technology has its bugs. Given the chance, everything can be overcome.

 

Forget stuff still in the testing phase. I'd like to see direct injection on GM cars. You think highway fuel economy is good now... How about another 10-30HP at the crank as well as 1-3 mpg increase in fuel economy?

-B

 

Direct injection is currently on many imports. Cadillac will have in their HFV6 next year. The 3.6 is going to jump from about 255 to close to 300 hp.

 

I'm against horsepower and fuel economy