05-06-2012, 04:03 PM
|
#1 (permalink)
|
Master EcoModder
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,907
Thanks: 3,475
Thanked 2,950 Times in 1,844 Posts
|
Audi Engine with Dynamic Cylinder Deactivation & Integrated Headers
|
|
|
The Following User Says Thank You to NeilBlanchard For This Useful Post:
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
05-07-2012, 11:17 AM
|
#2 (permalink)
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,530
Thanks: 4,078
Thanked 6,978 Times in 3,613 Posts
|
I'm out of the loop, but are VW and Audi still connected at the hip?
If so, the cylinder deactivation might be the same as here: http://ecomodder.com/forum/showthrea...ion-20943.html
|
|
|
05-07-2012, 11:21 AM
|
#3 (permalink)
|
EcoModding Jack
Join Date: Nov 2010
Location: Sacramento
Posts: 335
Thanks: 12
Thanked 58 Times in 40 Posts
|
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.
|
|
|
05-07-2012, 02:02 PM
|
#4 (permalink)
|
EcoModding Apprentice
Join Date: Jan 2008
Location: SF Bay Area
Posts: 150
Thanks: 5
Thanked 16 Times in 11 Posts
|
Quote:
Originally Posted by MetroMPG
I'm out of the loop, but are VW and Audi still connected at the hip?
|
VW and Audi are more than "joined at the hip". VW bought Auto Union in 1964, which had owned the Audi brand name since 1932 (tho no cars had been produced under that name since the thirties). Virtually every Audi on the road today is 100% VW.
__________________
Best tank ever: 72.1 mpg in February 2005, Seattle to S.F.
New personnal best 'all-city' tank June '08 ... 61.9 mpg!
Thanks to 'pulse-n-glide' technique.
|
|
|
05-07-2012, 02:32 PM
|
#5 (permalink)
|
Eco-ventor
Join Date: Oct 2010
Location: sweden
Posts: 1,645
Thanks: 76
Thanked 709 Times in 450 Posts
|
The sliding cam-sleeve mechanism appears to be exactly the same.
__________________
2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
|
|
|
05-07-2012, 06:26 PM
|
#6 (permalink)
|
Master EcoModder
Join Date: Jul 2010
Location: Belgium
Posts: 4,683
Thanks: 178
Thanked 652 Times in 516 Posts
|
Quote:
Originally Posted by MetroMPG
I'm out of the loop, but are VW and Audi still connected at the hip?
|
They're fully connected.
Using an identical engine line-up, the same platforms, the same parts, the same accessories.
Just the cosmetics, price and marketing are different.
Yeah.
I hope they'll also combine this technology with CNG.
__________________
Strayed to the Dark Diesel Side
|
|
|
05-07-2012, 08:54 PM
|
#7 (permalink)
|
Master EcoModder
Join Date: Feb 2009
Location: Phoenix
Posts: 593
Thanks: 106
Thanked 114 Times in 72 Posts
|
Is that integrated manifold (and associated cooling) going to mean - or enable - putting the exhaust catalyst directly at the collector instead of under the car?
I'm guessing that could help with packaging.
__________________
Work From Home mod has saved more fuel than everything else put together.
|
|
|
05-07-2012, 10:28 PM
|
#8 (permalink)
|
Master EcoModder
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,024 Times in 1,304 Posts
|
Personally I think they are going in the right direction with the integrated exhaust manifold. I think they should go even further and get some of that exhaust heat in the intake manifold as well as eliminate the head gasket as was done decades ago.
With a single casting consisting of the intake, exhaust, and cylinder walls combined with the head you would never see any gasket failures in those most prone areas.
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 I don't like is the pistons still reciprocating as well as the upper half of the rods as well as the imbalance of two cylinders subject to combustion heat dissipation and two that are not.
regards
Mech
|
|
|
05-07-2012, 11:38 PM
|
#9 (permalink)
|
(:
Join Date: Jan 2008
Location: up north
Posts: 12,762
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
|
I think the cost/complexity of making multi engines sync and/or the objectionable NVH of running them out of sync hurts that concept.
|
|
|
05-08-2012, 09:37 AM
|
#10 (permalink)
|
Master EcoModder
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,024 Times in 1,304 Posts
|
Come on Frank. Mazda is using a start stop system that stops the crank at a specific position and restarts the engine with compression only. That's some very precise positioning, and the engine does not naturally stop just after TDC compression stroke.
Coupling to two cylinder engines in one position would not be difficult at all, if they even needed to be coupled at a specific crank position. As long as they are independently balanced I don't see the necessity for any specific coupling position.
Of course if they were pressurizing a hydraulic accumulator there would be no issue with connection whatsoever.
regards
Mech
|
|
|
|