GM Takes Cylinder Deactivation to Next Level

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We recently heard the next-generation small-block V-8 engines coming from GM will have a unique cylinder-deactivation capability that can reduce or activate from one to eight cylinders. GM revealed this information during the debut of the 2019 Chevrolet Silverado 1500 at the 2018 North American International Auto Show in Detroit. Current-generation GM pickups use an active fuel management system that reduces the number of active cylinders from eight to four.

According to Green Car Reports, the new technology came from a Silicon Valley startup company GM Ventures purchased in 2012 that designed engine control software that could make an existing V-8 significantly more fuel efficient.

Originally called Dynamic Skip Fire, the Tula Technology system yields huge fuel-economy improvements — up to 15 percent over engines without cylinder deactivation GM said when it purchased Tula. Renamed Dynamic Fuel Management, the system will be used on the two V-8 engines that will power the 2019 Silverado 1500 and GMC Sierra 1500 when they hit dealerships later this year.

If you want to know how the system works, we found a video that explains it in more detail. We expect we'll be hearing much more about this technology in the future as it is likely to spread across all the full-size SUVs and pickup trucks, and far beyond. Check out the video below.

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Comments

This is why GM doesn't need a turbo 6. Great job!

These are the kind of articles I enjoy. Technology and innovation is required to drive engine development forward. Back in the 90s, GM, unlike Ford had designed the blueprint for a great V8 engine and its potential is still being realized and developed. FORD however developed a reputation of poor performance and reliability with their modular V8 offerings. This landed them in multiple class action law suits for over stating their power outputs and reliabity issues and costly repairs. ( spark plugs and cam phaser issues). The result of this forced Ford to abandon V8 engine development and move onto more simply forms of power and efficiency by using small engines and turbos.

Ya, great information. Thanks. I really hope these good old V8 engine stay around for a long time, this technology allows them to be. If the good old American V8 motor were not available to the American public, it would be a sad day. The V8 is as American as Apple pie, keep them alive GM, Ram, and Ford.

@GMS
Your only partly correct. While I am no fan of the mod motors, The 4.6 has proven very dependable (albeit low power unless forced induction) You could not give me the 5.4. That was junk. Your also wrong that Ford can’t make a great V8, they have - the coyote, hurricane and voodoo are examples of (finally) respectable V8s from Ford. I’d say they are on par with GM, Fiat and Toyota from a quality standpoint.

Another attempt from GOVT motors because they were not able to update their ancient V8's so they need to some kind of effort to keep up with the others..
Personally if I'm buying a V8 truck, I'm not expecting good mileage & last thing I need is more electronic interference & potential for things to go wrong...


you are going to by a V8 truck

@ Lionel

Your point is futile!! The V8 does everything better than Fords turbo 6's......so whats your point???

Of course smart people would choose a simple yet effective v8 that LASTS and is capable of doing TRUCK DUTIES!!!

Great! now all the plugs can foul and destroy the piston rings. the AFM on my 2010 5.3 Silverado has left me limping home 7 times and has required new pistons, rings, valve cover, oil deflector, decarbon, etc. all before 40,000 miles. my #1 and #7 cylinders are their 4th set of plugs and I only have 77,000 miles.

NO THANKS.

Your also wrong that Ford can’t make a great V8, they have - the coyote, hurricane and voodoo are examples of (finally) respectable V8s from Ford. I’d say they are on par with GM, Fiat and Toyota from a quality standpoint.

Posted by: Grnzel1 | Jan 24, 2018 2:00:26 PM

I meant that Ford abandoned development of fuel efficient technologies for their modular V8 truck engines. Ford has chosen to go all out performance with their V8 offerings by using over head cams and multivalve designs. This approach does limit the engine size if fuel efficiency is still a consideration. Hence, the only V8 truck offering is a 5,0 litre that delivers less fuel efficiency than larger more powerful V8 engines from other manufactures.

GM's AFM is a friggin joke, and this is even funnier.


Good luck!

@ Frank

Then the Ecobust is a total failure because it doesn't give you any economy when towing or unloaded!!! TOTAL FAILURE!!!

At-least Ford pulled their head out of their @$$ and made the 5.0L coyote better!! Now that's a great motor!!!

@ Frank

Then the Ecobust is a total failure because it doesn't give you any economy when towing or unloaded!!! TOTAL FAILURE!!!

At-least Ford pulled their head out of their @$$ and made the 5.0L coyote better!! Now that's a great motor!!!


Posted by: TNTGMC | Jan 24, 2018 3:55:18 PM

Take it up the IKE Mountain and your crappy 5.3 and 6.2L will be left at the bottom of the hill.

I'd rather drive a CGI Boosted V6 then a crappy V8 that disengages each cylinder and causes uneven wear and no compression at nearly 75K, which then requires a rebuild. But GM will sucker you out of the warrantly.

A Laughable Failure - A Tale of a GM engine

PROOF:

http://www.gmtruckclub.com/forum/threads/another-5-3-with-afm-bites-the-dust-chevrolet-active-fuel-management-problems.112629/

https://grassrootsmotorsports.com/forum/off-topic-discussion/has-gm-solved-there-issues-with-active-fuel-management/123031/page1/

Great! now all the plugs can foul and destroy the piston rings. the AFM on my 2010 5.3 Silverado has left me limping home 7 times and has required new pistons, rings, valve cover, oil deflector, decarbon, etc. all before 40,000 miles. my #1 and #7 cylinders are their 4th set of plugs and I only have 77,000 miles.
Posted by: Mike | Jan 24, 2018 2:40:37 PM


GM eliminated most of the issues with AFM in their Gen V LT-based engine in 2014. There are over 4 million Gen V engines with AFM on the road today and the rate of AFM-related issues is a fraction of it was on the Gen IV V8's. And that's with AFM kicking in more often now than it did in the Gev IV days.

Plus, if you don't like AFM, it's easy to deactivate. There's at least half a dozen ways to turn the system off. Plus the system can be deleted completely. If only it was that easy to disable all the stuff that causes a 3.5 Ecoboost to fail....

Ford tards are really going to cry when their junk eco pop v6 buzz box gets blown off the road and passed by a GM truck running on one cylinder. HAHAHAHA!!!!!!!!!

Wow all the Ford fans in here must have been sleeping under a rock for the last 5 years. The completely redesigned Gen V V8's that GM came out with in 2014 haven't had an issue with oil consumption and rarely have a lifter fail. Heck, Mobil 1 bought a 2015 Silverado 5.3 and ran it for 520k miles, changing the oil every 20k miles and never had a single engine issue.

https://mobiloil.com/en/article/why-the-mobil-advantage/mobil-1-performance/chevy-silverado-motor-oil-results

Since you guys think that a totally different 5.3 from 2010 is the same design and has the same problems as a 5.3 sold today, I guess we should start assuming the 5.0 Coyote spits out spark plugs and eats timing chains and guides like the old 5.4 mod motors. That seems to be the level of intelligence you guys are using.

@ Frank

90% of population won't drive up the ike or higher elevation....but u go brag about that!! Have fun with those timing chains and turbos when they go out!!

HAVE YOU HEARD THERE IS NO REPLACEMENT FOR DISPLACEMENT!!!

There are thousands of more GM v8s on the road with 200k plus miles then your ecobust ever will

Plus, answer this question for me......Why hasn't Ford pit engines in boats since 89???
Bc they suck and are unreliable!!

Then this is not a V8.

Plus, answer this question for me......Why hasn't Ford pit engines in boats since 89???
Bc they suck and are unreliable!!

Posted by: TNTGMC | Jan 24, 2018 4:46:35 PM

You're an idiot beyond comprehension. GO HOME!!!

Where I live, there are tons of mountains and high elevations.

Ford sells way more Ecoboosted trucks then your pile of 5.3L/6.2L.

Heck, people rather choose the 4.3L, GM knows it's the volume seller.

Sure is a v8, it has 8 cylinders genius!

Why would anyone dispute the fact that GM makes superb V8 , and is very reliable and capable of doing work all day. Sure I drive a Cummins powered work truck, but as far as gas engines the little ecoboost engines are not what I would choose in a full size pick up. The inline 6 Duramax is going to be popular with the miners, loggers, oil field workers, as most of them drive diesel. Not many people up here would choose a V6 gas engine in their truck, they use way to much fuel when loaded.

@ Frank

Again with insults bc u have no answer to my question!! Because 12 million Americans who own boats know the answer!! GM motors are superior in every way...chew in that old man!!!

And it doesn't sell more ecobusts than Gm's v8s. U are crazy to think that!! But u do drive a Ford so it show your intelligence....

GM has sold over 100 million small block v8s!! Swallow on that for a minute.....your eco-bust, just broke a million this year......have a long way to go!!!! Geeeeezzzz. You hurt yourself alot!!!

Btw...i am home now from work..thank u very much!!!

@ RAM Cummins

Thank you!! Another intelligent man! Btw...the Cummins is just as reliable as GM engines.....great choice

Posted by: TNTGMC | Jan 24, 2018 5:35:14 PM

You're an idiot.

@ Frank

Keep swallowing those words...hurts doesn't it!!!

Insults are all you ever have....lol

Have a great night...its almost your bedtime old fella!

Where I live, there are tons of mountains and high elevations.

Posted by: Frank | Jan 24, 2018 5:11:13 PM

Oh, one of the early adopters of legalized Marijuana. Now it all makes sense.

Then this is not a V8.

Posted by: Alex P. | Jan 24, 2018 4:53:27 PM

Actually it is every engine you ever wanted up to and including a V8. LOL!

Oh, one of the early adopters of legalized Marijuana. Now it all makes sense.


Posted by: GMSRGREAT | Jan 24, 2018 5:55:44 PM

What's your excuse? You don't smoke marijuana and you're still an idiot.

How much oil will these things burn?

Gallons.

Link of TNT and Frank going at it. Lol
Although I agree with TNT.

http://www.youtube.com/watch?v=2eZLBKrHE_E&list=RD2eZLBKrHE_E


I love amiri king!! So true about ford fanboys!!

I had a 1977 Dodge that would suddenly deactivate all eight cylinders usually in a turn. No power steering, no power brakes, and coasting into trouble. I got rid of that "lean burn" technology as fast as I could.

Wow

32 comments and only 2 or 3 worth reading

Wow

32 comments and only 2 or 3 worth reading


Posted by: Budsy47 | Jan 24, 2018 8:00:25 PM

Thank you for singling mine out from the noise. LOL!

Looks like the Dynamic Fuel Management will add about 5% better fuel economy to GM's V-8's, I was hoping for a bit more. I would think they could squeeze out another 1-2 mpg on the highway due to reduced weight, better aerodynamics and the 10 speed transmission. City fuel economy will benefit from the DFM slightly, but also from start/stop and the 10 speed as well. This should put the 6.2 liter with 2-wheel drive up to about 17 city and 24 hwy mpg, not too bad for approximately a 440 horsepower engine. Too bad you can only get the 6.2 on the High Country trim package for the 2019's. GM will almost certainly have the 48 volt e-assist available on at least one of their engines as Delphi has already developed it to work with 'Dynamic Fuel Management;.

Interesting photo used for this article, I don't usually look at trucks while laying on the ground unless I am changing the oil. I noticed on a previous article of Silverado vs. Ram, that the same angle was used when showing the Silverado, but the Ram was shot from a standing position

ALL THE GARBAGE MOTORS FAN GIRLYS ARE MAD BECAUSE THEY DIDNT GOT ANY TUBOS IN THE CHEVYOTA TUNDERADO HAHAHAHAHAHAHAHAHA KEEP DRAMING GARBAGE MOTORS FAN GIRLYS.

The V8 is as American as Apple pie, keep them alive GM, Ram, and Ford.


Posted by: SuperDutyF450 | Jan 24, 2018 1:58:01 PM

I agree. You can't beat an old tried and true V8. So glad G.M. and Ram have cylinder deactavation. If the manufactures stop producing them you can get them rebuilt or aftermarket so they will never die. Fords failed attempt at gas saving with a turbo has proven NOT to be fuel efficent. Ford trucks are making alot more heat under the hood with turbos. Heat causes major issues if not mangaged. LIMP MODE ANYONE? LOL

Nobody can do better than the F-150 Eco-Boost
The F-150 with the 2.7 Eco-Boost gets the BEST gas mileage of ANY full size gas truck out there.
NOT only does the F-150 get the BEST gas mileage it also has the more power , performance, and towing and hauling numbers.

If your heart is set on buying a new Silverado you'll be much better off with one with the 4.3 V6 cause you'll get the same power and performance with better gas mileage.

@gms
You said that Ford Mod V8s had poor performance and reliability - which I do agree with some of that. You went on to say that Ford abandoned the V8 for small engines and turbos. I disagreed and gave the examples of current gen Ford V8s that are much better than the first gen mod motors in performance and reliability. Ford V8s are within 1 to 2 mpg of the competition. Given the high degree of personal FE variability, I’d argue it’s not that relevant in a purchase decision - look at all the EB sold and they are not much more FE than a V8 - depending on how you drive

Well GM found another way to not get modern. If youre a welfare monkey that's great news to you. For the rest of us it just again justifies our low opinion of the bankruptcy baby. If it does work and hold up and really does deliver 15% or even a noticeable increase (I have a feeling that the actual improvement will be a far lower %age in practice as it always seems to be) it will at least be a CAFE/Marketing edge. In the battle for CAFE/MPG/Marketing every little bit here and there adds up.

What would be more interesting would be to see if this could be applicable on modern, DOHC, Variable Timing, DI, engines... many with turbos. If it is it will become the standard. If it isn't... well GMs has a long history of far bigger blunders that eventually led to it completely failing once already.

I agree TNT, in this case maybe V6 turbo is better left to Ford who already owns it. The only issue I see here, is the potential for more problems. Hopefully they already figured it out and it doesnt end up being a bust. BTW, the truck in the picture is sexy as heck! Love those wheel wells.

-CT

I have a feeling that the actual improvement will be a far lower %age in practice as it always seems to be)

Posted by: Clint | Jan 25, 2018 6:20:54 AM

As you are a Ford fan, I can understsnd your scepitatism towards your chosen automakers claims, but this article is about GM's already proven V8 fuel efficiency and performance approach.

http://cars.typepad.com/.a/6a00d83451b3c669e201b7c804a4b6970b-pi

http://cars.typepad.com/.a/6a00d83451b3c669e201bb08a94a74970d-pi

http://cars.typepad.com/.a/6a00d83451b3c669e201b8d18e84cd970c-pi

The video shows how the system operates with a DOHC. I wonder how this will work in an OHV motor?

To return to what this article is actually about this system promises " huge fuel-economy improvements — up to 15 percent over engines without cylinder deactivation GM said ".

Since it will be replacing engines that already do have cylinder deactivation how much fuel is actually expected to save when compared to a 2018 Chevrolet V8? That is what really matters.

Also, the system is made by Delphi and since GM spun off Delphi quite a few years ago they are free to market their products to anyone subject to contract agreements. What is the future of this system with other brands?

"the truck in the picture is sexy as heck! Love those wheel wells.
Posted by: crunchtime"

That is kind of scary.

I do agree that this technology will indeed improve fuel efficiency on both GM V8 engines, but this approach won't improve the engines power performance.
I am a proponent of camless engine technology. If GM or Ford wants to establish a clear advancment in engine performance and efficiency they will both embrace, develope and apply this technology ASAP.

DUMB!

If you have to keep shutting them off, then why buy it in the first place!

Sounds like a lot of worried ford fans, hahaha

@walter
I don’t really think anyone is worried. No performance benefit, perhaps marginal FE gain, and additional parts in the valve train - which by definition decreases reliability - more things to potentially fail. We’ll just wait and see...



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