V8 Engine Cylinder Deactivation?

[IGJoe2192]

I am waiting for a start stop system. Just by turning my car off at stop lights I have been able to save a lot of fuel. If this was about to be done reliably a lot of emissions would be eliminated and a lot of fuel saved.

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[tbonez3858]

I am waiting for a start stop system. Just by turning my car off at stop lights I have been able to save a lot of fuel. If this was about to be done reliably a lot of emissions would be eliminated and a lot of fuel saved.

I'm not sure if I could ever get used to the engine shutting off at a light.

I wonder what the long term wear and tear is for shutting down the engine and restarting at every light under city conditions..

 

[DHG1078]

I'm not sure if I could ever get used to the engine shutting off at a light.

I wonder what the long term wear and tear is for shutting down the engine and restarting at every light under city conditions..

Hybrids do it, and they seem to be pretty reliable. The start-stop system won't do it for every light, I think you have to be stopped for x amount of time before it does. Not too sure on that though. Also, it won't turn off if your using the A/C or anything that draws lots of power from the motor. I think the start-stop feature is great personally for economy cars and such.

 

[Grimace427]

I'm not sure if I could ever get used to the engine shutting off at a light.

I wonder what the long term wear and tear is for shutting down the engine and restarting at every light under city conditions..

Hybrids do it, and they seem to be pretty reliable. The start-stop system won't do it for every light, I think you have to be stopped for x amount of time before it does. Not too sure on that though. Also, it won't turn off if your using the A/C or anything that draws lots of power from the motor. I think the start-stop feature is great personally for economy cars and such.

I'm a Mercedes tech and we've had Eco Stop/Start for a few years now and it is very good. You can barely hear or feel the engine stop then restart. It will shut off every time you stop for more than 1-2 seconds and restart as soon as you take your foot off the brake pedal. Very seamless and something I could enjoy. It is also completely defeatable with a button on the center console/dash.

I have a video on my YouTube channel showing how well it works. Search "Stanger427 Eco Stop Start".

 

[minjitta]

Ford Lincoln have it on Lincoln Mark VII back in the 80s. Ford started way back then, I remember you can chose running 8-6-4. My dad never use it, just not remember it to use it.

 

[w3rkn]

NO... don't expect to see that^.. until they go DFI..!

2017..

 

[Grimace427]

NO... don't expect to see that^.. until they go DFI..!

2017..

I forgot to mention Direct Injection is actually critical to the stop/start function. A properly setup system will utilize the position of the crankshaft and a piston at TDC to assist the starter motor in cranking the engine over by firing a short combustion stroke. Since fuel is controlled directly with the piezo injectors the combustion cycle can be that much more precise and it takes a huge load off the starter motor. This is how the system can crank and start the engine so quickly, sometimes so fast the driver doesn't even notice. You won't ever hear the starter motor actually crank the engine.

 

[tbonez3858]

I'm a Mercedes tech and we've had Eco Stop/Start for a few years now and it is very good. You can barely hear or feel the engine stop then restart. It will shut off every time you stop for more than 1-2 seconds and restart as soon as you take your foot off the brake pedal. Very seamless and something I could enjoy. It is also completely defeatable with a button on the center console/dash.

I have a video on my YouTube channel showing how well it works. Search "Stanger427 Eco Stop Start".

Interesting..Even with shutting down a V8 you dont think you would notice it?

 

[Grimace427]

Interesting..Even with shutting down a V8 you dont think you would notice it?

The video I posted on my YouTube channel was a CLS63 AMG. You can hear it with the radio off, but if you are just commuting it's barely noticeable.

 

[Sterling Archer]

Figured I'd throw in that people on the engineering team (not hard to find them in Ann Arbor) have told me cylinder deactivation is largely a marketing gimmick, and offers no real improvement in fuel economy. As such Ford in general has no plan of offering it on any model.

When you think about it, the coyote is already a remarkably efficient engine. At only 5.0 liters of displacement, even without direct injection it is just a hair behind the c7's 6.2 liter engine. Factor in how much it is underrated so they don't have another 4.6L fiasco (which put down below the rated specs) and I think it's clear which set of engineers did their homework. And at 18/25 (which will go up for the 15) it is competitive with the corvette's 18/29 (which benefits from a 7th gear for highway cruising).

The simple fact of the matter is that I would much rather have Ford do what they do best, and invest their R&A money towards designing highly efficient engines - rather than marketing gimmicks.

 

[Trackaholic]

Figured I'd throw in that people on the engineering team (not hard to find them in Ann Arbor) have told me cylinder deactivation is largely a marketing gimmick, and offers no real improvement in fuel economy. As such Ford in general has no plan of offering it on any model.

When you think about it, the coyote is already a remarkably efficient engine. At only 5.0 liters of displacement, even without direct injection it is just a hair behind the c7's 6.2 liter engine. Factor in how much it is underrated so they don't have another 4.6L fiasco (which put down below the rated specs) and I think it's clear which set of engineers did their homework. And at 18/25 (which will go up for the 15) it is competitive with the corvette's 18/29 (which benefits from a 7th gear for highway cruising).

The simple fact of the matter is that I would much rather have Ford do what they do best, and invest their R&A money towards designing highly efficient engines - rather than marketing gimmicks.

For the Corvette the cylinder deactivation gains 2 MPG on the HWY if I recall. I think that took it from 27 to 29 in the manual, but since it was defeatable the EPA required that GM take the average of 28 for the advertised mileage. In any event, a 2 MPG improvement on 27 is over 7%, which is huge when the CAFE requirements are taken into account. From an owner's perspective, maybe not so much.

I do know that I would rather take the MPG hit in order to reduce weight and complexity.

-T

 

[Wade]

As long as you can turn the feature off I'm ok with it.

Yup, agree. Go ride in a Charger or Challenger when it drops to 4 cyl. Sounds like a wet balloon fart.

 

[SLOWBRA]

Cylinder deactivation is easiest in push-rod motors and motors with direct injection. If you want it then you have to wait till ford launches DI in the coyote motors...

 

[sotek2345]

Interesting..Even with shutting down a V8 you dont think you would notice it?

I guess it would depend on how quiet (or not) your exhaust is. If you are running an off road x pipe and muffler deletes I think you would notice!

 

[buRNout]

Yup, agree. Go ride in a Charger or Challenger when it drops to 4 cyl. Sounds like a wet balloon fart.

Exactly. My Camaro had it. It sounded terrible. I remember nudging the accelerator many times to make that sound go away. Not as annoying as the rattling dash panel, or the buzzing door speaker or even the grinding sounds from the rear end. And not nearly as annoying as the "ding" sound that went off every time that piece of crap had to be shut off and restarted because of faulty crankshaft position sensor. Gah I hated that car.

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