The World's First CVVD Engine - Genius!

UPDATE! There was another engine which had variable valve duration (Rover, 1995). I asked Hyundai about this, and from one of their presentations: "Such method, which allows change in valve actuation by altering the rotational speed of cam, is thought to be devised by Mitchell [2, 3]. The Rover first launched the engine to the market in 1995 [4]. The Rover’s VVC (Variable Valve Control) system was applied to 1.8L inline 4-cylinder engine in order to change the intake valve’s timing and duration. VVC system requires four camshafts to drive the intake valve; two of the camshafts are driven by timing belt at the front of the engine, while the other two is driven at the rear of the engine by the exhaust camshaft. Because of such feature, VVC system cannot be used with CVVT simultaneously, impeding the independent control of the valve opening and closing timing."
So in this case, the "world first" is the fact that it is the first production engine to combine CVVT with CVVD, as the Rover mechanism did not allow for variable timing. Thanks for commenting about the Rover engine - fascinating to learn about!

Technical innovations looks nice on the paper, the most important for me is about maintenance and repair costs on the long term, saving half a liter of fuel per 100 km and having to spend thousands for repairs a few years later makes no economic sense to me, i'll stick for now with Toyota brand that use proven technology that lasts, no matter if that tech is "OLD", it works and for a long time, on the ecologic side, saving little bit of fuel and having to spend more on maintenance and repair should be put on balance, fuel energy saved /// energy used for making new parts and additional maintenance.

what happen if free valve get broke? Exactly valve and piston will marry

I have the 1.6 turbo in my kia forte gt. Best car ever! Burger JB4, AEM intake, throttle race chip, catch can. I'm putting down over 300 hp on a fully stock engine! Fell in love with the hyper-responsive 1.6 in my 04 aveo. Couldn't wait for thr turbo, and it's better than I had hoped. Thank you Korea!

ccvd kicked in yooo

Another RATIO. . . "more parts = more cost"

is the CVVD operation for all the intake valves/cylinder or just cylinders 2 and 4?

9 years of R&D, costly testing, trial - to gain what??? At the end of the day, are the benefits actually measurable and worth it? It is like spending $5,000 on tuning a piano instead of a $200 tune job - just to get that last 1 %. Is it really worth it? To a concert pianist, perhaps, but the does the audience care? Or like spending $5,000 on a camera when the $1,000 does the same job with 99% of the same results? Who is going to care or notice? It is the final picture that counts to the public.

When do you call it and say enough is enough? With VVT and other technologies, this is proven to work well. What else can be realisiticaly gained that is measurable and make a difference - a point of minimum returns? To the anal mechanical junkie, nothing is sacred. To the real world, common sense prevails. This may look like a technical marvel, but is it not overkill?

Personally, I would be surprised if they get 5% better mpg. A simple turbo enhances a car huge. Don't need this fancy valve timing stuff. solves a ton of problems. And power, and economy.

Great video

Many thanks for this video. Congratulations !

only vtec matter and some 2zzge vvt and cvvt and all that crap are all the same all engine have vvt but some have intake runner variable and new 1.6 korea engine have dual injector hemi have dual spark plug all that for nothing

Wile E. Coyote, Super Genius. Beware of the ACME Supply Catalog.

Hello Jason, I like your hat!

great job

Impressive

now combine it with vtec, vvt, we have a valve with variable duration, lift and timing.. i think we can because all those system operate in different apart of the engine

EMISSIONS WILL CHANGE WHEN COMPRESSION AND COMBUSTION BY VALVE DURATION OCCURS , IF WE LEAN THE MIXTURE TO COUNTER THE DURATION WHICH INCREASES VOLUME / MIXTURE , IT KILLS THE PURPOSE ! NOW 4% IT MEANS NOT MUCH GAIN FOR ALL THE ENGINEERING , I CAN ASSURE THAT A SMALL VERY RELIABLE SUPERCHARGER SURE GIVE BETTER RESULTS AND WITHOUT SO MANY COMPONENTS OF MOVING PARTS AT STAKE ! I LIKE DUCATI IDEAS, SO MERCEDES, OR ALFA , AND I M FOR INNOVATION , BY MY QUESTION MARK IS 4% , INNOTICED ON
DEMAND , I M FOR SIMULATED CITY , CONGESTED CITY TAXI CAB DRIVING CONDITIONS AT TWO SHIFTS OF 12 HOURS EACH !

I have a 2.5 Smartstream Non Turbo with this technology. At 16 K Miles I sometimes get a loud valve tapping sound when engine is cold. I think one of the Hydraulic self-adjusters is sticking. AND Yes I use 0w20 Syn oil only. Now I have to tow the car into the dealership when it happens again. Flawed technology.

Is that a 1968 firebird 6 cylinder? They were CVVT.

People underestimate Hyundai because of the cost. We're talking about a company that made their way by making massive ocean going ships. They used their knowledge of ship building to make cars, a much easier prospect, but they do things like dip the entire unibody into a tank of paint and with electrolysis paint every last atom of the car. That's why they don't rust. That's why they last forever unless damaged. Brilliant company. By the way, their lane centering technology is some of the best in the world. Impressive cars and proof that great cars don't have to cost 100k.

Change the oil every 5000 kilometers, don't abuse the engine and with enough time and parts and money you could bring the engine over the 500,000 kilometers line

JFC just drive an EV.

Any chance you could cover Fiat's multiair system next?

I was extremely intrigued by the innovation until you brought up engineers as some kind of defense... You seriously gonna use an appeal to authority to tell a bunch of pissed off mechanics (that have to put up with crumby over complicated designs from engineers) to trust the flipping engineers? I said good day sir!!!

is it worth for engine eff? the mechanical design is quite complex

ice engine is a fff joke. in 2023. more moving parts ssss. for a little more power. and all the pollutants in the air. it can cost you your life, or cause cancer. lung cancer. asthma.

Very informative. Thanks!

Mechanical Genius.

Great on paper, give it 8-10 years plus, a mechanics & owners nightmare.

A solenoid type valve actuator can change the world as we know it. If Koenigsegg is manufacturing their own in house, yes it may cost as much as the daily driver and not be practical to use however, it can be refined and produced by anyone. Solenoids themselves are extremely reliable unless some outside factor interferes with their function.

This is a genius solution!
Sure additional parts means, by necessity, additional points for failure to occur, but modern metallurgy and ever-increasing tolerances, promise that the time between degradation or failure is far between.

As an inventor, I see those nine years of development to be well spent. It shows that this system has gone through multiple iterations and has been largely perfected.

It appears to be symmetrical, thus balanced, as well. I do wonder about the increase in noise and the frequency of that noise.

Like balance shafts, this is a winner of an idea. I would like to see a comparison between otherwise identical engines (standard cams system, a system with one intake using this system paired with a standard valve and the dual intake system, as shown) It seems intuitive that a hybrid cam (one standard single grind cam pared with this variable system) might have an added advantage of added turbulence in the cylinder, which has its own series o benefits.

Looks like they're just trying to improve on the already existing cam phaser. As for the free valve technology, cost would be a big factor, as well as patent's, and R&D. Koenigsegg already has produced similar free valve technology, into another manufacturer's production engine. It greatly improved the engine, in a multitude of ways.

Yes, really GENIUS until the engine gets in the hands of a car owner who thinks changing engine oil every 10,000 miles is a good idea. Like a lot of "genius" ideas put on paper in the past, in practice, the lack of foresight and engineering development employed to make it more robust and durable usually causes the exercise to blow up in everyone's face. As some famous person once said - "first you need endurance, first you gotta last"....

Am gonna stick with my rotor / stator motor = simple . (no transmission needed)

that looks like a good idea. it will require good oils.
I am curious about the head creeping around under it.
how tolerant will it be for slight missalignments?

Interesting, but I'll be more impressed when a manufacturer gets rid of the timing belt/chain. I want less maintenance over economy or horse power.

Hello! Is there any 3D Model of a CVVD, VVL or VVT engine? I'd like to print one for my university!

Now if they could just build motors that didnt burn excessive amounts of oil.

The Valvetronic system is a BMW variable valve lift system which, in combination with VANOS, allows infinite adjustment of the intake valve timing and duration. Hyundai? :)

So surely you need to adjust the fuel injection to match the valve duration. Otherwise you will run into rich/lean issues. Although I am assuming direct injection. Indirect injection wouldn't care.

Continues Variable Valve Diameter... ?

Okay, assuming I'm not gonna get to see the first ever diaphragm engine valve, I'm confused.. Bring on the video! :-)

Getting this cvvd engine in my new kia soon. 1.5tgdi 160hp

Fiat launched the MutiAir engine in 2009 predating this Hyundai by 10 years. Wikipedia says

Multiair is a hydraulically-actuated variable valve timing and variable valve lift engine technology enabling "cylinder by cylinder, stroke by stroke" control of intake air directly via a gasoline engine's inlet valves. Developed by Fiat Powertrain Technologies
Fiat could have used it on the exhaust side but found minimal benefits I

Yeah, waaay more moving parts, that can fail or get worn out.....since modern engines are way more unreliable then the old ones.... but they are "efficient" ???

What actuates the rod that changes the position? Is it a electric general purpose actuator?