riff_raff wrote:Personally, I think VVT should be allowed in F1.
With poppet engine valves, the relationship between duration and lift are not completely independent. In an ideal valve motion, the valve would instantaneously lift to its point of max flow and then close in the same manner. But due to physics, less duration usually means less lift, even with electrohydraulic or electromechanical actuation.
As tok-tokkie notes, pure EH or EM valve actuation systems are not generally fail safe. This is one major reason automakers have not yet fully embraced them.
Tractorboy85 wrote:As for VVT in F1, I'm not sure it would make much sense. I've not actually seen the duty cycle for an engine being used around an F1 track, but I can imagine you either spend a lot of time at full load and the maximum speed, at idle, or going from a lower engine speed and load to the max speed full load condition.
Engineer wrote:Hy guys
I am a graduate student of mechanical engineering college on University of Ljubljana
And I was thinking abouth the theme 4 my diploma.
I have a question about wariable valve timing.I know that wariable valve timing system works by rotating (correcting)the whole cam shaft,al cylinders at once.
Now I would like to know what you think of the idea,of correcting all valves independantly.
I mean that if I want to correct just one or two cylinders,and the position of valves on other cylinders stays unchanged.
Please tell me if this would have any impact on perfomace,emisions or anything else.
What advantages and disadvantages would that kind of engine have.
It's just an idea,so please don't ask me why do I want to do so.
I thank you 4 your answers
Have a nice day!
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