Can someone please explain what Vanos is??????

[E36Turbo]

I was trying to explain it to a friend and i was just getting confused myself. Can someone please explain the meaning and what it does and all? Thanks

[PrinceE30]

Variable Valve Timing.

As your engine changes RPMs, the time which gasoline actually is injected and detonates is normally the same at 1000RPMS as it is at 7000RPMS. However, because of the movement of the pistons and such, the release of the gas into the system can be too late (or early) for optimal detonation time. Therefore, VANOS will open valves earlier (or later) to let gas and air into the cylinder at a more optimal time. On new VANOS engines, both intake and exhaust valves are variable, but they used to only be in the intake.

From what I hear, VANOS always is on...and infinitly variable whereas iV-TECH or VVTi only work above 7000RPMS. Also, BMW uses this on not only 4 cylinder engines, but 6 and 8 as well. AUDI had a great explination on their site a while back. Check it out. I'll keep an eye out for it as well.

-Prince

[Joey325i]

Its like VTech but better

[Tnucu]

Originally posted by Joey325i
Its like VTech but better

Um its "like" VTEC, but ALOT better....

[PrinceE30]

It "is" V-TECH, but at all RMPS and infitesimally variable...



-Prince

[ToM3]

clicky

[SfLbMw]

does my 1994 318is have vanos and if not, why the hell not

[Joey325i]

Originally posted by SfLbMw
does my 1994 318is have vanos and if not, why the hell not

All BMWs after '93 came with vanos

[blown318]

It's different than Vtec because w/ vanos, cam timing changes. W/ Vtec, what changes is valve lift and durations due to another cam lobe that comes into use. Cam timing does not change w/ Vtec. This is a very simplified explanation, but thats how i've always understood it. Feel free to add to or correct what i've said if i'm wrong.
Also, 94 318s don't have vanos

[nanoflux]

This site below has a GREAT explaination, in detail, about what it does and how it works for BMWs. It's what I read when I was trying to figure it out.

http://www.bmwworld.com/technology/vanos.htm

[Matt]

ummmm, bimmer pride and all, but VANOS sux compared to VTEC.

VTEC actually allows the profile of the cam to change at a certain RPM, as Alex Mc put it: "Its like switching from stock cams to schricks at some RPM"

its what allows a tiny motor to make so much HP, because it's optimized for a high RPM as well as low.

[PrinceE30]

VANOS WAS NOT MEANT TO MAKE BIG HP...

Yes, you heard that right. VANOS is not meant to create a lot of horseopower. What is does do though is give you a lot of low end torque, often where the strait sixes lack the omph to get moving. This will allow you a more drivable car at all speeds, whereas when you have V-TECH you need to be driving over 6000RPMS (approximatly 80% of redline). Do you drive your Civic/Prelude at 6500RPMS often?

I think not. VANOS is be better. Proof : M5

-Prince

[JRockCLS]

Originally posted by PrinceE30

From what I hear, VANOS always is on...and infinitly variable whereas iV-TECH or VVTi only work above 7000RPMS

WAY off.

VTEC switches cam lobes at a pre-determined RPM, and for my car it switches at ~5000rpm, IIRC. Prelude, Accord, Civic, CL/TL all hit VTEC changeover around five grand. Only the S2000 revs high enough to warrant a 7k VTEC engagement rpm. Heck, my car redlines at 7200rpm.

i-VTEC intelligent valve-control continuously adjusts the camshaft, just like the newest version of Vanos, although Vanos seems to be more concerned with maintaining torque than increasing high-end horsepower. Either is equally as effective, it's just a matter of which you prefer.

This will allow you a more drivable car at all speeds, whereas when you have V-TECH you need to be driving over 6000RPMS (approximatly 80% of redline). Do you drive your Civic/Prelude at 6500RPMS often?

I think not.

While your numbers are exaggerated, I agree to a point: I use a similar logic for why I won't spend a ton of money to buy headers for my car - on my car headers only give a noticeable boost in high rpm range (above 5200rpm... pretty much only in VTEC range) and because I'm not driving in that part of the powerband very often, I don't feel it is economical for me to buy super-expensive headers that I won't use all that often. Only Comptech currently makes headers for my car, and they are $1250 + install. Compared to most other V6 headers which are around $800 (you BMW people don't count because ALL your mods are super-expensive)!

[PrinceE30]

Sorry about the inaccurate numbers with the RMPS. I've heard different stories from different people and sites. Thanks for clearing it up though!

-Prince