I can see how VTEC works, What about VANOS

[dot communist]

I can see how VTEC works, but I cant for the life of me figure out how VANOS works on BMW's. anyone have a nice diagram like this one? (which BTW i used to figure out vtec)

http://www.bellonsales.com/DeleteMe/v-tech.jpg

[S52M]

http://lmgtfy.com/?q=how+vanos+works

[Kevlar]

http://lmgtfy.com/?q=how+vanos+works
Since this guy isn't that helpful... let me point you in the right direction.

http://www.bmw.com/com/en/insights/technology/technology_guide/articles/vanos_double_vanos.html

[E36M34life]

http://www.bmw.com/com/en/insights/technology/technology_guide/articles/vanos_double_vanos.html




The name Vanos is derived from the German term "variable Nockenwellensteuerung"



If there was such a thing as a run-on word, this would take the cake. :lol3

[dot communist]

Since this guy isn't that helpful... let me point you in the right direction.

http://www.bmw.com/com/en/insights/technology/technology_guide/articles/vanos_double_vanos.html
+1 at that, think thats not where i went first? lol. and thanks for the help, but what that shows is what it does, not how it works :( Is there some sort of sliding bearing that pushes the cam back and forward or somthing?

[themadrussian]

http://en.wikipedia.org/wiki/VANOS

http://answers.yahoo.com/question/index?qid=20090124130057AANJfRN

[blackonblack135]

Very much like VTEC!

[dot communist]

the reply on that yahoo answers thing is good, but its a little hard to follow. What i get out of that, is that on the cam sprocket there is a helical gear, and the camshaft moves back and forward on it to give it different gear ratios, and therefore valve timing?

EDIT: OOOOK, i see how this works now, the helical gear is not cone shaped, it just twists the cam back and forward to give it advance/retard timing. this picture cleared it up:
http://i36.photobucket.com/albums/e29/PEI330Ci/Vanosexploded.jpg?t=1240696689

[325bob]

I get vanos, but the Honda system isn't "electronic" or "timing", its just a high oil pressure mechanical switch for an extra valve? I guess "variable" is kinda correct, but its really an on /off deal.

[Mitch]

I get vanos, but the Honda system isn't "electronic" or "timing", its just a high oil pressure mechanical switch for an extra valve? I guess "variable" is kinda correct, but its really an on /off deal.

While it's binary in regard to cam lobe selection (it's either on high or low), modern i-VTEC engines also have continuously variable intake cam advancement. The combination of the two systems make for an engine that is both sporty when you put your foot down, but economical when you don't.

[epmedia]

From the looks of it:

VTEC opens the valves more at higher engine speeds.

VANOS adjusts the timing of the valves at different engine speeds.

Correct me if I'm wrong, Robert

[bmwquick]

From the looks of it:

VTEC opens the valves more at higher engine speeds.

VANOS adjusts the timing of the valves at different engine speeds.

Correct me if I'm wrong, Robert

That's how I see it too. vtec switches to a larger cam lobe while vanos just rotates the cam a few degrees for optimal valve timing , right?

[Sneaky]

i have double vanos <3

[undertaker]

:shiftyso there is a vanos kick??

[gtxragtop]

Nothing like the Vtec as described above. Vanos varies valve timing, Vtec varies valve lift and duration.


Very much like VTEC!

[bowmang]

vtec only changes the lift on one cylinder if i remember correctly.

vanos changes the valve timing on all cylinders, and with the addition of VVT (valvetronic) it also changes the lift of all cylinders, therefore giving you infinite variable valves.

[Mitch]

vtec only changes the lift on one cylinder if i remember correctly.


VTEC is for all cylinders, and it engages on all cylinders at the same time. It's just like having two sets of camshafts, one economy and one sport. Above a designated RPM (on my car, 5800rpm) and about half throttle, it switches from the economy camshafts to the sport camshafts.

But obviously instead of having four camshafts, it just has two, each with two different sets cam profiles. It just makes it easier for people to think about it that way.