Vanos
- Thread starter xLibelle
- Start date
Thanks Vance for the link.
I remember talking to one of the salesman at a dealer about the double Vanos. he was explaining it in technical terms which just whizzed by over my head. He mentioned something that is also adapts to the driver and the method of driving. If the driver is an aggressive driver the vanos would adapt to that and the car would feel more powerful than say compared to another driver who is not aggressive. I asked him that because when I test drove 2 330ci, one felt more powerful than the other.
Is he blowing smoke?
I remember talking to one of the salesman at a dealer about the double Vanos. he was explaining it in technical terms which just whizzed by over my head. He mentioned something that is also adapts to the driver and the method of driving. If the driver is an aggressive driver the vanos would adapt to that and the car would feel more powerful than say compared to another driver who is not aggressive. I asked him that because when I test drove 2 330ci, one felt more powerful than the other.
Is he blowing smoke?
thats what i was thinking.
the mech. wants to use a non-vanos, i assume, because it isnt a trusted system for tuning and its easier to more acurately tune a system that doesnt have some crazy hydraulic addition. i didnt read the whole site, but i believe a system like that helps with fuel economy.
all at my cost of course. i brought up the fact i was in the market for doing immediate mods for race purposes and his face lit up, lol. i need to get a hold of a scca rules book and see which class i want to pursue before i start spending the money on an engine swap
the mech. wants to use a non-vanos, i assume, because it isnt a trusted system for tuning and its easier to more acurately tune a system that doesnt have some crazy hydraulic addition. i didnt read the whole site, but i believe a system like that helps with fuel economy.
all at my cost of course. i brought up the fact i was in the market for doing immediate mods for race purposes and his face lit up, lol. i need to get a hold of a scca rules book and see which class i want to pursue before i start spending the money on an engine swap
Isn't this Double-VANOS just BMW's version of variable valve timing? I mean it's nothing special, everybody's doing it now (even Toyota and the other economy car companies). The purpose is to improve power and response throughout the rev range. Such as how BMW believes in high revs (meaning they want to give you the power at high revs), thanks to double-VANOS, the engine still provides good power for low-rpm relaxed driving. ![[:)]](/images/smilies/smile.png "Smile [:)]")
Go to the link above and you will see how very special VANOS and double-VANOS really is. Most variable valve timing works on the intake valves only (like VANOS), whereas double-VANOS works on the intake and exhaust valves.
Improves fuel economy, smoothness at idle, flattens the torque curve, extends max torque beyond peak HP point, decreases emmisions, infinitely variable adjustments (VANOS has 2 distinct change points).
Improves fuel economy, smoothness at idle, flattens the torque curve, extends max torque beyond peak HP point, decreases emmisions, infinitely variable adjustments (VANOS has 2 distinct change points).
i'm not an expert, but this is what i little i know..
double VANOS is a continuation of the technique honda first coined as a V-tec. back in the day an engine only had one cam shaft setting, thus at whatever engine speed, the valves would lift up and down at pre-determined timing. this is good during lower rpms, but at higher rpm rev ranges, the engine needs more air to be pumped in, or less, (can't remember, but i think more" to get optimal power.
the original v-tec engines and a second set of cams that switched the profile at higher rev ranges to let engines perform better at higher rev range. ie: extracting more out of an existing engine, thus honda was able to get insane hp from a 4cylinder w/out a turbo. not to mention that sweet v-tec scream at the upper ranges.
the latest seems to be the infinitely variable cam, which likes of BMW's double VANOS, toyota's V-tti, etc. they allow engine to perform at max perf at any give rpm range by allowing jsut right mixture of fuel, air and all that good stuff to make your engine work to its potential. and is supposed to eek out every ounce of power the engine is capable of making.
yea, that summed up what you guys mentioned above also.. ah well..![[:D]](/images/smilies/biggrin.png "Big Grin [:D]")
only thing i could think of picking a non vanos engine would be the tunability of the engine, and the vanos setup probably makes things more complicated for him imo..
double VANOS is a continuation of the technique honda first coined as a V-tec. back in the day an engine only had one cam shaft setting, thus at whatever engine speed, the valves would lift up and down at pre-determined timing. this is good during lower rpms, but at higher rpm rev ranges, the engine needs more air to be pumped in, or less, (can't remember, but i think more" to get optimal power.
the original v-tec engines and a second set of cams that switched the profile at higher rev ranges to let engines perform better at higher rev range. ie: extracting more out of an existing engine, thus honda was able to get insane hp from a 4cylinder w/out a turbo. not to mention that sweet v-tec scream at the upper ranges.
the latest seems to be the infinitely variable cam, which likes of BMW's double VANOS, toyota's V-tti, etc. they allow engine to perform at max perf at any give rpm range by allowing jsut right mixture of fuel, air and all that good stuff to make your engine work to its potential. and is supposed to eek out every ounce of power the engine is capable of making.
yea, that summed up what you guys mentioned above also.. ah well..
only thing i could think of picking a non vanos engine would be the tunability of the engine, and the vanos setup probably makes things more complicated for him imo..
