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#4687123 - 03/07/18 07:27 AM Cylinder Deactivation vs Turbocharger
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1727
Loc: Alberta
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.

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#4687130 - 03/07/18 07:35 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
Trav Offline


Registered: 11/20/06
Posts: 18885
Loc: MA, Mittelfranken.de
Turbo over cylinder deactivation any day.

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


Edited by Trav (03/07/18 07:37 AM)
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#4687131 - 03/07/18 07:35 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1407
Loc: 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.
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#4687135 - 03/07/18 07:38 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
Eddie Online   sleepy


Registered: 12/07/03
Posts: 9566
Loc: 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
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#4687138 - 03/07/18 07:40 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
demarpaint Offline


Registered: 07/03/05
Posts: 29771
Loc: NY
Turbo with EFI, they can keep cylinder deactivation and DI. hide
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#4687149 - 03/07/18 07:56 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1727
Loc: Alberta
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.


Edited by Snagglefoot (03/07/18 07:57 AM)

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#4687150 - 03/07/18 07:57 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
rooflessVW Offline


Registered: 12/24/11
Posts: 4047
Loc: North Carolina
I wouldn't mind having both.
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#4687151 - 03/07/18 07:58 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
Char Baby Offline


Registered: 05/25/05
Posts: 10022
Loc: 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!
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#4687164 - 03/07/18 08:17 AM Re: Cylinder Deactivation vs Turbocharger [Re: Char Baby]
demarpaint Offline


Registered: 07/03/05
Posts: 29771
Loc: 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.
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#4687168 - 03/07/18 08:20 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
rooflessVW Offline


Registered: 12/24/11
Posts: 4047
Loc: 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.
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#4687178 - 03/07/18 08:28 AM Re: Cylinder Deactivation vs Turbocharger [Re: demarpaint]
Char Baby Offline


Registered: 05/25/05
Posts: 10022
Loc: 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.
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#4687188 - 03/07/18 08:31 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: 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.
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#4687191 - 03/07/18 08:32 AM Re: Cylinder Deactivation vs Turbocharger [Re: rooflessVW]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1727
Loc: Alberta
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.

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#4687193 - 03/07/18 08:34 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
IndyIan Offline


Registered: 09/23/08
Posts: 9092
Loc: 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.
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#4687199 - 03/07/18 08:39 AM Re: Cylinder Deactivation vs Turbocharger [Re: Snagglefoot]
rooflessVW Offline


Registered: 12/24/11
Posts: 4047
Loc: 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.
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