Audi Engine with Dynamic Cylinder Deactivation & Integrated Headers

[Frank Lee]

I'd like to see how it's done.

Ever run multi-engine equipment? Both engines are "balanced" but if they are out of sync, YOU KNOW IT.

[tjts1]

Originally Posted by nimblemotors

yet more complicated ICEs..the integration of the exhaust manifold into the head and the required water cooling of the aluminum exhaust seems a disaster waiting to happen, oh about at 75k miles when the water pump goes out and not just a head gasket failure, but literal engine meltdown. Must be a safer way to heat up the engine faster?

The more they try to improve the ICE, the more electric cars become appealing.

Disaster waiting to happen is what VW/Audi does best. These people can't be trusted with anything mechanical or electric. Just look where they put the thermostat on their V6.

Yes the whole bumper, radiator, headlights etc have to come off.

Originally Posted by Old Mechanic

While I understand the principles involved with cylinder disabling, why not just have two 2 cylinder engines capable of working independently or together. I think Ford ecoboost 3 cylinder may be a better compromise unless aero drag is reduced to the point where two cylinders would do the job up to about 75MPH, but then you could also reduce the displacement of the 3 cylinder.

What an awful idea. You should work for Audi, you would fit right in.

[Frank Lee]

^In situations like that I have often wished to have the mfer- ahem, I mean engineer- that came up with that right there so I could hand him a wrench and say "Have at it, Einstein".

[taco]

That's cool. I know Chevy had/has a v6 that can cut to three but I didn't see big mpg gain.

My penastar 3.6 in my jeep had built in exhaust manifolds also. Things of the future I guess


I like the idea but do not trust vw/ Audi.

[pete c]

I've wondered about old mech's idea of two separate engines. The output of each engine could be geared together with one of them going through a clutch or torque converter or maybe both.

Syncing them up, if it would be necessary shouldn't be much of a problem. You would have the two engine's coolant systems tied together which would keep the standby engine at operating temp.

[mwebb]

http://www.youtube.com/watch?v=df4vG...layer_embedded

VW has already designed and produced and
obsoleted
what is basically 2 V type engines on 1 crankshaft in one block

that is old news

[EdKiefer]

The title says dynamic cylinder deactivation but is it really dynamic .
Can it change which group of cylinders it wants to shutdown .
This is main reason I am not a fan of cylinder deactivation . those cylinders that get shutdown at part throttle end up with plugs missing after a while and possible oil issues as while the plugs never stop sparking there no combustion to clean them off .
Many manufactures are using these systems, they don't give big boost in mpg but maybe few mpg with mid size V6 . hardly any improvement in city driving as most systems would be in full mode most times .

[Daox]

There really isn't much you can do for city driving other than offer some form of regenerative braking, start/stop, and lighten the vehicle as much as possible. Most drivers just mash the pedal to the next red light. You're going to get bad mileage if you have a tiny or large engine.

Highway mileage is where everyone is making the biggest strides with aero and other things.

Also, a few (3) mpg in a 25 mpg car is a fairly decent 12% efficiency increase.

[tjts1]

Originally Posted by mwebb

W8...

Another idiotic VW/Audi design where they sandwiched the timing chains between the transmission and the engine. When one of those plastic chain rails or tensioners fails (and they do quite often) The whole engine and transmission is coming out of the car. All their engineers need to be lined up and shot.

[nimblemotors]

The Prius shows just how much those "isn't much" factors are, 45mpg without any eco driving at all. See how my son drives his prius and mash the pedal is right, and it still gets 45mpg around town, which is all the driving he does.

Water pump and thermistat failures are
probably the most common repairs, and I've been impressed car companies have improved the ease of doing them, water pumps mostly.
I suppose they have gone backward on this aspect?

The idea of multiple gas engines is actually quite interesting for an ecomod.
While certainly too expensive for OEM, when we have talked of adding a 5th wheel electric drive, one could add another drive using a single cylinder engine..makes me go hmmmmm

Originally Posted by Daox

There really isn't much you can do for city driving other than offer some form of regenerative braking, start/stop, and lighten the vehicle as much as possible. Most drivers just mash the pedal to the next red light. You're going to get bad mileage if you have a tiny or large engine.

Highway mileage is where everyone is making the biggest strides with aero and other things.

Also, a few (3) mpg in a 25 mpg car is a fairly decent 12% efficiency increase.