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Cylinder Deactivation vs Turbocharger #4687123
03/07/18 07:27 AM
03/07/18 07:27 AM
Joined: Dec 2017
Posts: 2,987
SE British Columbia, Canada
Snagglefoot Offline OP
Snagglefoot  Offline OP
Joined: Dec 2017
Posts: 2,987
SE British Columbia, Canada
In order to meet CAFE gas mileage standards manufacturers are experimenting with new technologies such as cylinder deactivation and turbocharging. In addition both are getting direct injection.

Itís interesting that cylinder deactivation and turbcharging are almost opposite. In one, you take a powerful engine and deactivate some cylinders to make it a weaker but more fuel efficient engine, and in the other you take a fuel efficient but weak engine and make it powerful. The Ford F-150 with the 3.5 twin turbo is one example and the GM 6.2 liter with the AFM system is another.

What is your opinion on the technology and which system would you rather own.


If you want the job done right......do it yourself.
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687130
03/07/18 07:35 AM
03/07/18 07:35 AM
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
Turbo over cylinder deactivation any day.

Edit: Tossing CAFE into the bin of failed schemes would be the ideal answer.

Last edited by Trav; 03/07/18 07:37 AM.

ASE L1, Master. Deutsch Meisterbrief.
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687131
03/07/18 07:35 AM
03/07/18 07:35 AM
Joined: Jul 2016
Posts: 1,682
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline
Joined: Jul 2016
Posts: 1,682
Jacksonville, FL
I suppose I'm in the camp of neither. If I had to choose a fuel economy engine it'd be a pre emissions diesel. If I was forced to choose a turbocharged gas engine or an engine that shut off cylinders I don't know which one honestly. A port fuel injection turbocharged engine isn't so bad, but I'd rather not have a DI only turbo. Perhaps the EB gen 2 with direct and port injection wouldn't be bad. The GM LS engine with AFM is all around much simpler and easier to work on than the EB Ford. If I had to pick between the EB Ford and a LS Chevrolet it'd be the LS all day.

Meanwhile I'll just keep driving things I can actually work on that are devoid of excessive complex cylinder management devices, direct injection and forced induction.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687135
03/07/18 07:38 AM
03/07/18 07:38 AM
Joined: Dec 2003
Posts: 9,922
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,922
Florida, Cape Coral
Not sure your question can be answered. Turbocharging now uses small engines to bring them up to competitive power with non turbo engines, In past turbo engines the basic engine had more cubic inches and the turbo was added for increased HP. Today's turbos are for daily drivers and not necessarily for high performance. I am still undecided on cylinder deactivation because of past history and very little history for today's engines. A toss up in my opinion until we get more statistics. Ed


CX5 Touring 2.5L :-)
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687138
03/07/18 07:40 AM
03/07/18 07:40 AM
Joined: Jul 2005
Posts: 30,972
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,972
NY
Turbo with EFI, they can keep cylinder deactivation and DI. hide


God Bless Our Troops

Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687149
03/07/18 07:56 AM
03/07/18 07:56 AM
Joined: Dec 2017
Posts: 2,987
SE British Columbia, Canada
Snagglefoot Offline OP
Snagglefoot  Offline OP
Joined: Dec 2017
Posts: 2,987
SE British Columbia, Canada
In my thinking, there is another reason for CAFE. Electric cars are coming. If there is no CAFE, short sighted governments will legislate ICE ( internal combustion cars) out of existence.

Last edited by Snagglefoot; 03/07/18 07:57 AM.

If you want the job done right......do it yourself.
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687150
03/07/18 07:57 AM
03/07/18 07:57 AM
Joined: Dec 2011
Posts: 5,100
North Carolina
rooflessVW Online content
rooflessVW  Online Content
Joined: Dec 2011
Posts: 5,100
North Carolina
I wouldn't mind having both.


"Zed's dead baby, Zed's dead."
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687151
03/07/18 07:58 AM
03/07/18 07:58 AM
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
How about, small displacement 1.5L 4 cylinder w/direct injection & turbocharger as well as engine shut off at complete stops? 2018 Equinox!


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Cylinder Deactivation vs Turbocharger [Re: Char Baby] #4687164
03/07/18 08:17 AM
03/07/18 08:17 AM
Joined: Jul 2005
Posts: 30,972
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,972
NY
Originally Posted By: Char Baby
How about, small displacement 1.5L 4 cylinder w/direct injection & turbocharger as well as engine shut off at complete stops? 2018 Equinox!


Now you're talking, with stop/start and no way to disable it.


God Bless Our Troops

Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687168
03/07/18 08:20 AM
03/07/18 08:20 AM
Joined: Dec 2011
Posts: 5,100
North Carolina
rooflessVW Online content
rooflessVW  Online Content
Joined: Dec 2011
Posts: 5,100
North Carolina
How about a 7L+ V12 with 2 (or more) turbos, cylinder deactivation and start/stop? Throw in direct AND port injection, maybe give it two plugs per cylinder for good measure.


"Zed's dead baby, Zed's dead."
Re: Cylinder Deactivation vs Turbocharger [Re: demarpaint] #4687178
03/07/18 08:28 AM
03/07/18 08:28 AM
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,551
ROCHESTER, NY
Originally Posted By: demarpaint
Originally Posted By: Char Baby
How about, small displacement 1.5L 4 cylinder w/direct injection & turbocharger as well as engine shut off at complete stops? 2018 Equinox!


Now you're talking, with stop/start and no way to disable it.


I know, right?
I'd like to have the option of disabling it.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687188
03/07/18 08:31 AM
03/07/18 08:31 AM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Turbo over variable displacement, hands down. If my info is correct VD usually only gains 1-2 MPG where, say, a car offered with a 1.4T and 1.8-2.4L NA engine can be 4-5 MPG different between the engines. Not to mention it seems a lot of the engines with VD have oil consumption/sludging issues that in some cases literally can't be prevented without substantial over-maintenance, where today's turbos just need regular (but not super short) OC's with quality synthetic to last a very long time.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Cylinder Deactivation vs Turbocharger [Re: rooflessVW] #4687191
03/07/18 08:32 AM
03/07/18 08:32 AM
Joined: Dec 2017
Posts: 2,987
SE British Columbia, Canada
Snagglefoot Offline OP
Snagglefoot  Offline OP
Joined: Dec 2017
Posts: 2,987
SE British Columbia, Canada
Originally Posted By: rooflessVW
How about a 7L+ V12 with 2 (or more) turbos, cylinder deactivation and start/stop? Throw in direct AND port injection, maybe give it two plugs per cylinder for good measure.


And DOHC with VVT.


If you want the job done right......do it yourself.
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687193
03/07/18 08:34 AM
03/07/18 08:34 AM
Joined: Sep 2008
Posts: 9,235
Ontario, Canada
IndyIan Offline
IndyIan  Offline
Joined: Sep 2008
Posts: 9,235
Ontario, Canada
You only need cylinder deactivation or turbos if you want power AND mileage. If you just want mileage, an NA of the right size with some good gearing does pretty well with much less complexity.
The 2.5 subaru's with the CVT don't give up mileage to the turbo CUV's at all, just some torque and hp.


07 Focus ZXW, 5spd manual, 218km M1 5W30
18 Outback 2.5 CVT 15km 0W20
Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot] #4687199
03/07/18 08:39 AM
03/07/18 08:39 AM
Joined: Dec 2011
Posts: 5,100
North Carolina
rooflessVW Online content
rooflessVW  Online Content
Joined: Dec 2011
Posts: 5,100
North Carolina
Originally Posted By: Snagglefoot
Originally Posted By: rooflessVW
How about a 7L+ V12 with 2 (or more) turbos, cylinder deactivation and start/stop? Throw in direct AND port injection, maybe give it two plugs per cylinder for good measure.

And DOHC with VVT.

Of course! 5 valves per cylinder.


"Zed's dead baby, Zed's dead."
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