The World's First CVVD Engine

[762mm]

Another mechanical nightmare with "smart technology" to keep the EPA happy by giving "up to 5% better fuel economy and fewer emissions".

I wonder how long it will take before this monstrosity is forced down everyone's throat, including Ford customers?


Soon we will reminisce about the "good old days of the super-reliable 5.4L 3-valves!"

 

[jeff kushner]

What an overly complicated solution! I don't have sound here at work but I did skim thru the vid....looks like Honda Engineers designed it!

Suzuki does VVT with a simple ball bearings for several years now....as the cam speeds up, the bearings crawls further out a ramp...bad description, I know...



jeff

 

[TobyU]

Not really too bad of a design. He must be an engineer though and I don't like his benefit of the doubt that it is durable....but at least he says time will tell us.

Sad all that and they push the emission more that power or fuel mileage BUT that means aftermarket will make ways to flip that and to hell with emissions.

Of course mechanical makes that harder. Electronic like free valve would be easy to tune.

I have said for a long time that IF ICE stay around and evolve long enough....all valves will be solenoid wit infinite possibilities BUT when one fails esp open....look out.
Failures will be more common than timing chain failures today....but maybe not as bad as timing belts are and used to be.

 

[LovinPSDs]

Check out "Free Valve Technology"

Koenigsegg has youtube videos out there... Basically an air actuated valve train. Which if you think about it is super cool, you can basically program or build any type of cam profile you want with a computer. It's continually variable, and also DRASTICALLY reduces the rotating assembly weight. It's a pretty cool watch.

 

[TobyU]

The free valve isn't A New Concept the theory has been around a long time and there's been several ways to do it. It just still isn't economical enough or durable enough to go mainstream. I'm sure this will change as I mentioned before if the internal combustion engine stays around long enough. For years we have people selling RV Towing cams or high-performance cams and the problem with that was you had to sacrifice top-end to get low and mid-range or sacrifice low in to get top-end. Then Along Came the two position V tec engines like Honda had for you get mostly The Best of Both Worlds. Now we have more variable valve timing but it's really not about power it's mostly about fuel efficiency and Emissions. Now with things like the free valve it gives you unlimited cam profiles and variations. It's kind of like you could program it and have five different camshafts and see which one you like the best. Similar to when I had a fuel injected ZX12R motorcycle with a power commander module. You could download custom fuel Maps. There was a major difference in the fuel injection map on performance when I try different ones. Camshafts will be even more noticeable.
The biggest issue for me is the fact that at least with normal valve train the valves default position is closed and out of the way of the Piston. When you start having separately mechanically operated valve actuators, you have the chance that one could stay open just a hair too long or stick open or just opened at the wrong time and now you have a bent valve an engine that has to come apart.

 

[joethefordguy]

Another mechanical nightmare with "smart technology" to keep the EPA happy by giving "up to 5% better fuel economy and fewer emissions".
I wonder how long it will take before this monstrosity is forced down everyone's throat, including Ford customers?
Soon we will reminisce about the "good old days of the super-reliable 5.4L 3-valves!"

the narrator is a liar. rather than respond to the youtube comments he refers to, he just makes fun of them. Some of those people have considerably more than 9 years of valvetrain experience.
second, this is not continuously variable valve duration. the duration is variable within a small range.
the idea's been around forever. basing valve timing on mechanical components is inherently limiting; and freeing valve timing from that limitation would produce some magnificent motors.
reliability would be an issue that anyone with half a brain would have to ask about.

ultimately, this idea will not reach it's full potential until some way of controlling each valve independently of the others, controlled by the engine control software, is developed. Something like very fast acting solenoids mounted on each valve stem. Again, reliability.