Valvetronic technology

[Minikong]

any 1 very familier with valvetronic technology?

is it some thing like vvt or vtec?

 

 

[Heartbreakid]

Valvetronic technology is one that does away the throttle valve (Butterfly valve some call).

[Qr25vet]

valvetronic is just variable lift control via a stepper motor for the intake camshaft,working in conjunction with VANOS that does the cam phasing for both the intake and exhaust cam. with valvetronic,when the engine is warmed up,it does away with the conventional throttle valve and instead using valve lift to control the volume of air going in.

[Minikong]

Valvetronic technology is one that does away the throttle valve (Butterfly valve some call).

 

so it claim that it will lead to better throttle response, and more effiecent getting the ernegy from the fuel.

so boil down is it actually the same as vvt or vtec? just different name?

[Qr25vet]

so it claim that it will lead to better throttle response, and more effiecent getting the ernegy from the fuel.

so boil down is it actually the same as vvt or vtec? just different name?

its not the same cos the valve lift in valvetronic is variable unlike I-VTEC or VVT...

[Minikong]

its not the same cos the valve lift in valvetronic is variable unlike I-VTEC or VVT...

 

but is the concept or idea the same? on the final product of having better fc, and better engine efficency?

Edited December 2, 2010 by Minikong

[Heartbreakid]

http://en.wikipedia.org/wiki/Valvetronic, this should clear some doubts. Edited December 2, 2010 by Heartbreakid

[Minikong]

http://en.wikipedia.org/wiki/Valvetronic, this should clear some doubts.

 

 

but i always give a pinch of saly for such detail theory base facts.

any bimmers driver here with real life experience with this technology care to share?

[Atec1267]

i have a BM, FC is 11km per little...good enough?

[Minikong]

i have a BM, FC is 11km per little...good enough?

 

u sure? or is it paper fact?

[inlinesix]

but i always give a pinch of saly for such detail theory base facts.

any bimmers driver here with real life experience with this technology care to share?

What kind of details u need? Tell diff is diff loh. Tell u to read wiki u KPKB. Go & google.

[RadX]

What kind of details u need? Tell diff is diff loh. Tell u to read wiki u KPKB. Go & google.

 

I swear I saw VULVAtonic.........

[Heartbreakid]

If you have the pinch, the best is go to BMW website to find out the actual technology first hand. Because such technology be it theory or practical works the same, just that one can't judge the fuel economy out of theory.

[Crazecow]

but i always give a pinch of saly for such detail theory base facts.

any bimmers driver here with real life experience with this technology care to share?

 

Bro, confirm technology like Valvetronic does work. Toyota's one is called Valvematic.

 

At low RPM, your engine work most efficiently with low valve lifts. But as RPM goes up, you need more lift to allow more air in. The most basic form of such technology is VTEC. It uses 2 sets of cam lobes to alter valve timing and lift. However, VTEC is rather crude as it offers only 2 levels. think of it as a gearbox having just 2 forward gears. Then With better technology like valvetronic, it becomes 6 speed gearbox or even CVT. More levels means you can have optimum lift for a wider range of RPMs.

 

If you want to know why we need all these technology? Thats because of the way combustion engine works. Bigger does not always means better (we know that bigger exhaust causes you to lose low end power). Same thing for valve lifts. If you have high valve lift at low RPM, you lose efficiency and power. If your lift is not enough at high RPM, it becomes a restriction. Our engines sibeh mahuan ones...... Electric motor no such problems.....

[Minikong]

Bro, confirm technology like Valvetronic does work. Toyota's one is called Valvematic.

 

At low RPM, your engine work most efficiently with low valve lifts. But as RPM goes up, you need more lift to allow more air in. The most basic form of such technology is VTEC. It uses 2 sets of cam lobes to alter valve timing and lift. However, VTEC is rather crude as it offers only 2 levels. think of it as a gearbox having just 2 forward gears. Then With better technology like valvetronic, it becomes 6 speed gearbox or even CVT. More levels means you can have optimum lift for a wider range of RPMs.

 

If you want to know why we need all these technology? Thats because of the way combustion engine works. Bigger does not always means better (we know that bigger exhaust causes you to lose low end power). Same thing for valve lifts. If you have high valve lift at low RPM, you lose efficiency and power. If your lift is not enough at high RPM, it becomes a restriction. Our engines sibeh mahuan ones...... Electric motor no such problems.....

 

hi craze cow, i am deeply enlighten by your explnation, and thanks alot, as my new car servicing interval changees from 25k to 12k mileage, so i am wondering is it due to the new valvetronic technology, that they keep emphazing

[inlinesix]

Bro, confirm technology like Valvetronic does work. Toyota's one is called Valvematic.

 

At low RPM, your engine work most efficiently with low valve lifts. But as RPM goes up, you need more lift to allow more air in. The most basic form of such technology is VTEC. It uses 2 sets of cam lobes to alter valve timing and lift. However, VTEC is rather crude as it offers only 2 levels. think of it as a gearbox having just 2 forward gears. Then With better technology like valvetronic, it becomes 6 speed gearbox or even CVT. More levels means you can have optimum lift for a wider range of RPMs.

 

If you want to know why we need all these technology? Thats because of the way combustion engine works. Bigger does not always means better (we know that bigger exhaust causes you to lose low end power). Same thing for valve lifts. If you have high valve lift at low RPM, you lose efficiency and power. If your lift is not enough at high RPM, it becomes a restriction. Our engines sibeh mahuan ones...... Electric motor no such problems.....

Ur explanation of valvetronic is flaw to a certain extend. VTEC has steps whereby valvetronic is stepless. In addition, benefit of valvetronic is @ low RPM where throttle is partially load. That's why valvetronic was nvr implement on hi rev NA ///M engine.

[Crazecow]

Ur explanation of valvetronic is flaw to a certain extend. VTEC has steps whereby valvetronic is stepless. In addition, benefit of valvetronic is @ low RPM where throttle is partially load. That's why valvetronic was nvr implement on hi rev NA ///M engine.

 

Well, I am trying to make the analogy as simple as possible. Not trying to nickpick, but IMHO a fully "stepless" system isn't exactly practical and may be too complicated. I believe such valvetronic or valvematic tech simple alter valve lift by at most 100-200 steps. Thats alot when you consider the valve lift varies by 0.1 or even 0.05mm for different rpm.

 

valvetronic's purpose is for low end RPM and improve FC. However, the technology is not limited to just better FC. It can be used to improve high RPM power as well. "Stepless" valve lift is currently not implemented for high RPM power. Only step ones like VTEC, VVTLi and Variocam plus are used. \

 

Of course, valve size matters as well. Up to a certain point, valve lift no longer affect air flow because the port diameter (determined by the valve size) becomes a restriction, then you need bigger valves, porting etc....

[Crazecow]

hi craze cow, i am deeply enlighten by your explnation, and thanks alot, as my new car servicing interval changees from 25k to 12k mileage, so i am wondering is it due to the new valvetronic technology, that they keep emphazing

 

I don't know but it may be possible. With more efficient combustion, there will be less deposits and less soot and hence engine oil will be cleaner and possibly last longer.

 

However, Turbo engines usually have shorter mileage between oil changes. This is mainly becaues the oil is used to lubricate and cool the turbo as well. The high temp of the turbo results in breaking down of the oil. Hence, you need to change more often compared to NA.