valvetronic

[Skandalos]

inreliable, expensive and short of life.

[beaggyboy]

these fantastic cars & the likes are truly worth every penny one pays, period.Some 'KIT' planes & helis,which quality arent anywhere near these road vehicle arent at all suppose to carry hefty pricetag equalling or more than that of the very high-end model of any such marque,be they a Mercedes or a BMW

[plastbestikk]

this system is inreliable.



[SparkDischarge]

@plastbestikk Which is why the third generation Valvetronic was just added to the new M5.

[wildbloodydragon]

Basically it's a continuous VVT then. You know, like Toyota?

[JamesThWilliams]

I realize the guy speaking isn't an engineer or automotive technichian, but come on name an internal combustion engine where the valves don't fully control intake?

[youngb1ood]

@JamesThWilliams so true. maybe he meant camshaft dont fully control intake... that makes more sense.

[Ampotube]

Valvetronic technology is pretty good, but..

BMW use it only in high-end engine;

FIAT multiair system is better and fiat make it available for all theirs cars.

[GermanSk8er]

@Ampotube: Nonsense. BMW uses it in virtually every engine class, starting from the smallest 1.6l MINI-Engine to the Rolls-Royce 6.75l V12 engine.

[Turbotrips]

There must be some better way to fully use the potential in petrol. After all, the 4 stroke combustion (otto) engine is way outdated.

[youngb1ood]

@Turbotrips 2 stroke?

[SparkDischarge]

@Turbotrips 6 stroke? Water injection, which flashes to steam, for better thermal efficiency.

[peteandniko]

valve tronic is just the latest and most efficient variable valve system VTEC was by no means the first similar systems have been used since the 1920's fiat patented it in the 60's and alfa used it in 1983 years before honda even in there m/cycles

[revenblood]

Come on, this is someting honda and toyota are doing since the early nineties with vtec and vvti.

But its good to see other car campanies inventing similar technologies, maybe incrysing the petrol combusting engine timelife. But nothing compares to the quasiturbine technology in tearms of internal combustion engines.

[dregenius]

VTEC and Valvetronic are not the same technology. BMW's version of VTEC is called VANOS, and was also available in the early-mid 90's. Valvetronic is a totally different animal, because it alters the amount by which the valves open to throttle the engine, not using a conventional throttle. VTEC and VANOS are just to vary the valve *timing*.

[torcidaSTobrec]

@dregenius false vtech and vanos are not the same vanos = variable nockenwelle

[henderbt]

@revenblood

Major difference here, VTEC is a similar idea in that it varies valve lift. But it only has two positions ( basically on and off). Valvetronic is essentially infinitely variable throughout the RPM range. Much more involved to control

[ramcrazy360]

They don't explain that the reason their is less lift at idle is to increase the velocity of the incoming air/fuel mixture to create a stronger vortex within the cylinder, dispersing fuel throughout the chamber evenly at low RPM. This allows for more efficient combustion, requiring less fuel and "virtually" decreasing emissions. Lol, nice one.

[SparkDischarge]

@ramcrazy360 Yes that is a benefit to the low lift, but that is not the reason for the low lift.

The reduced lift (and commensurate duration) is how load control is achieved. The increased air velocity at part load leads to much smaller droplet size formation. Nissan quotes-at 2mm valve lift, 9 micrometers, [diameter] versus a conventional throttled engine at 157 micrometer. The surface area:volume is just so much better. Better heat flow into the liquid fuel, better knock resistance, etc.

[viper2788]

valvetronic, vtec, mivec, vvti - they're all different forms of the same concept, which almost every car company has. i dont know why honda feels that they need to advertise vtec on the side of their civics like its something special.

[potsmoker5000]

Because they were the first to use it, Origanally called Revolution-modulated valve control in 1983 on a CBR400, Later to be called vtec.

[canadianjob]

Virtually???? Anyway, bmw will be the best for ever, even if you bought one that was not very good, or had some problems, it's only because they were made in US or something close to it, german made bmws are awesome...i don't wanna bother anybody, but that's the truth, all over europe we have bmw made in germany, n they r great...

[potsmoker5000]

It's probably that in America people treat there cars like shit, Not using synthetic oils and only running the lowest octane of petrol. I've been in the sales buisness for automotive services and people over her are very tight about what they do to there cars. They'll let coolant go bad till there radiator is rotted out They'll let there transmission go to crap. no money is spent on there cars unless somthing breaks, even then they would rather get a new car, rather than fix what they fucked up.

[BillRR09]

@canadianjob you do understand that certain models are made in the "US" and certain models are made in "Germany" and some are even made in like "South Africa" It isnt like they just sell US made bmws in the US and German made ones in Germany. If your in Germany and have and E70 or E71 then it was made in the US and if you have and early model Z4 then that was also made in the US, doesn't matter where in the world it was sold. BMW quality is BMW quality.

[spidermath005]

@canadianjob

Actualy, Honda had the best NA hp per liter for 15 years, and the best hp/L bmw which is

333hp--3.0L--111hp/L is still even with with the 3rd best Honda,

200hp--1.8L--111hp/L Integra Type R, below the

185hp--1.6L--115hp/L Civic Type R, and the

247hp--2.0L--123hp/L S2000.

Ferrari just stole that record with the 2010 458 Italia, with

562hp--4.5L--125hp/L...

[Arlind86]

@canadianjob easy with that german made cars bullsh*t...i own a 95 thousand dollar w140 S500 when was brand new that is nothing but trouble and a money pit ..The w220 00-03 rust like crazy,had to do another paint coat to fix the problem. Bushing and suspension nightmares. I have owned them all, you get a bmw in the states and a GM car and you will see which one lasts longer, especially the north american winters. Friends 528i and 745i both trannys hard shift-quality my ass.in the end-Toyota wins

[Mikalfa75]

I'm italian and I'm proud of italian cars (look at my name :-) ) but I don't understand where originality is in MULTIAIR by FIAT...

[Osmanliempo]

Fiat multiair.... :O

[yanzodadon]

honda's got some competition.

[dangerriff]

old idea

[aemadero]

"improving fuel efficiency while VIRTUALLY decreasing emissions"

nice job slipping that in.

[kore464]

LOL, I heard that too. So it's *virtually* not really doing it? Ha ha

[NiGGeRWithaDICK]

i've owned to bmw's and they were both shit. im sticking with my acura tl type s and land cruiser.

[Kippey75]

top dog

[zacharyalan09]

Welcome to the future

[landyacht06]

welcome to the current almost all new generation bmw engines have dual vanos and valvetronic

[Carpower123]

Very Nice!!!