The Magic behind Nissan's VC Turbo engine
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- čas přidán 6. 09. 2024
- The internal combustion engine has been in development for more than a 100 years and in those years the basic idea has stayed the same, yes we have seen technologies like variable valve timing, direct injection, and new ignition systems but in today’s video we are taking a look at something insanely cool. Nissan made an engine with a totally new way of making a truly great engine.
This is the VC-Turbo engine. What makes this engine so special? Well lets get into it.
#Nissan #VCturbo #compression
12/26/22: Nissan's VC engine has long been the dream of MEs --- theoretical perfection. Unfortunately Nissan chose BOTH power AND economy. As a result this marvelous engine excels at neither but instead is a smooth blend of both. Better to tune it for one or the other and make some headlines.
BTW, other manufacturers achieve virtual VC thru variable valve timing and/or variable turbo boost. These are simpler solutions that achieve almost as good results. Retired in Sacto.
Is it reliable?
@@JIMMY-ck1oethere is an investigation of the government agency into failing Nissan VC-turbo engines. Google it for more details.
Nissan started Variable valve timing in the late 80s and they use the delayed valve timing and the valve overlap. That is nothing like variable compression, your statement lacks understanding. The volume of the cylinder only changes when the piston or the combustion chamber ie moving the valve area closer to the piston ie shaving the head, or changing the stroke of the piston. The compression ratio is determined by the liters the cylinder will hold in the space between the valves and the piston. That’s why a turbo that’s forced air induction is not called a variable cylinder engine, the volume doesn’t change.
Vc turbo rogue with fwd does 30 city 37 hwy. Higher than anyone else especially hyundai/kia and has the most or tied for tq in this class.
Is it reliable?
@@JIMMY-ck1oe who knows. The vc turbo had been out in the altima in 4cy form and jts been reliable.
I really agree that it just adds more complexity will need extra maintenance. Simple concept "If you want some gains you need to compromise for it somewhere else", You cant enjoy both at a given point of time
Maintenance isn't any different on this engine compared to others. Just because something is more complex doesn't mean that it will require any extra maintenance.
@@dkdanis1340Lets drop the maintenance part, But do you think the Germans wouldn't have tried to do something similar. Why did a company like Nissan stop using the Rotary Engines in production, Just give it a thaught on it
Just bought a 24 Rogue and so far the economy is 34 in mixed driving (75%highway)
Now if the dealer had not offered a lifetime warranty, I would have gone either to a Pathfinder with the V6 or to a Toyota
Summed it up at the end. The 3mpg better than the competition is not worth the risk of far more failure points on this new technology. I feel the new Altima is still a great car as long as you don't by the VC-Turbo SR version. If you want that kind of power, the options are unfortunately low due to Camry/Accord going to hybrids only with low 200s in HP respectively. However, that should still be plenty of pep for daily driving.
Great show. Get well soon 🙂
I think the engineers have forgotten what a ICE is and how it makes energy to turn the wheels. A ICE is a air heat pump. The more air the
More compression more heat equals more energy to turn the wheels. Why would you want to reduce normal operating compression?
When you add boost you need to lower compression unfortunately😂
@@ChrisVSCars der.. Generally turbo engine are built with a lower compression ratio. What they are doing is adding more spinning weight inside of the engine..just pointless.
You all are missing the point of variable combustion chamber size! Bigger is better for power. Gives the turbo room to do its stuff! And add more fuel. Boom more power. Nissan 3 cyl turbo engine puts out more power than the 4 cyl non turbo engine on same make and model. Also, getting better fuel mileage. It has maybe fewer moving parts. It is minus one piston, rod, valves, and associated parts.
There is one worrying design flaw in this if the video is realistic. The plain bearings on the control shaft seem to have shell bearings but the shaft only oscillates over a small angle. If this is representative of the actual design hydrodynamic lubrication won't work as it does on the crankshaft. It is to be hoped that Nissan have allowed for this with a big increase in oil pressure to these bearings!
I feel that a more useful invention would be an engine that has a larger (and possibly variable) expansion stroke, thereby getting more work out of each combustion cycle. The Atkinson cycle is just such an example (James Atkinson - British engineer - 1882, conceived in 3 designs). The piston rod linkages, however, are just as complicated as those in the VC Nissan engine, and need housing in a large cranck case... however, fuel economy would be expected to be much better... why "expected"... hasn't this engine been built in cars and put into practice somewhere? Well, no, because it has relatively low torque, and so the normal "Otto" cycle internal combustion engines have always been favoured... Still, given that fuel savings should at some point in human automotive evolution outweigh sheer power, perhaps Atkinson still has a chance... what do you think?
Our Nissan VC Turbo has been excellent. We have over 2 million miles on our2022 Rogue
2 million miles? They would be a world record
I’m sure this has been tried before and failed from over complexity.
I’ve had a pushrod 3800 v6 get as much power and around 9l/100km and that was from 90’s technology
One of the best engines ever the 3.8 pushrod v6 the 2008 grand prix
Still love the South African accent. Like, I'm pretty sure I subscribed just because I like listening to you talk so much.
Now I need to go watch Chappie...
Hahah I love that movie😂😂
The complexity point is of course very valid. However you were comparing a fixed compression ratio engine, which has had lots of time to evolve into its current highly optimized form to a VC engine that has not had that benefit. It will likely never have that benefit either. Currently there is no reason to buy one and without cash flow from that, there is little reason for the manufacturer to invest in it.
Your right on this one as more moving parts means more that can go wrong and the fuel savings just isn't there. I wish Mazda would bring back the rotary with Ernie Brink's modifications as that mechanic solved all the problems with a rotary engine and Mazda is stuck on class status and refuses to take the man's solutions seriously. czcams.com/video/C4Epo8C6CwI/video.html
What an absolute nightmare
cool video and engine . But ya is it worth the effort given the added complexity.
But Mazda has this technology though
I thought my 800cc Matiz was a small engine until you said 1 of your (6) cylinders has a capacity of 10cc. 1:49
Not worth the complexity
True😂
wait till they start having issues with them, and no one will know how to fix them....steer clear of Nissan in general, since the 1990s theyve been going downhill
sounds extremely complex, no thanks ill keep my 3.6 v6 with 330 hp, and gets 27 mpg on the highway...this is entirely too complex and will disintegrate after not being cared for correctly..smh, not to mention the Nissan CVTS
I am a Nissan tech and I can say without of doubt these engines are garbage .it's called over engineering. We have dozens of the 3 and 4 cylinders in our shop with knocking and power loss issues with no idea what's wrong or how to fix .we had Nissan engineers here they even took 4 engines back with them . And they were asking us what's the problem .that's when you know it's gonna be a shitshow . No recalls because you can't recall something if you haven't a clue . Good luck if you already bought one
work at an auto auction, we are seeing more and more 2023 and 24 Rogues coming thru, with engine issues...just in general Nissans with cvt problems...
I'll stick with v8s
dumbest engine design ive ever seen a couple extra mpg s