01-14-2018, 12:04 AM | #491 | |||
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I think all these scenarios are valid possibilities. imho The headlights though, the headlights. 2019 Silverado just launched dynamic skip-fire in Detroit. Will 2019 Camaros get Skip-Fire? .
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01-14-2018, 12:06 AM | #492 |
Drives: 2017 1SS camaro ,2SS a 68 + 08 C6 Join Date: Dec 2017
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01-14-2018, 04:47 AM | #493 |
Drives: Camaro 50th anniversary edition Join Date: May 2017
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Sorry for my ignorance but what is “Skip-Fire”
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01-14-2018, 05:19 AM | #494 |
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_____________________________________________ A car is fast enough, if you fear to unlock it in the morning." (Walter Roehrl) |
01-14-2018, 11:35 AM | #495 |
Drives: Camaro 2SS Join Date: Jan 2017
Location: Calgary, AB, Canada
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It means the V8 can technically be in V2 mode on the highway. I am not sure about 1 cylinder firing only though.
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01-14-2018, 01:58 PM | #496 |
Drives: 2018 1ss, 2021 silverado HD Join Date: Jul 2017
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Hopefully it's a smoother transition, unlike the current v4-8. This will let it run anything from 1-7 cylinders.
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01-15-2018, 10:35 AM | #497 |
I used to be Dragoneye...
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It sounds like it works more like PTM in the sports cars...all-electronic...meaning there might not be any hydraulic parts to wait for. I'm hopeful, this could be a game-changer.
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01-15-2018, 11:01 AM | #498 | ||
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01-15-2018, 11:06 AM | #499 |
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Would this possibly solve the lifter issue that has been plaguing the 6.2 liter engines as it is a different way of deactivating the cylinder?
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01-15-2018, 11:29 AM | #500 |
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I'm skeptical. That system looks fragile...
I think I'd rather see electric solenoid operated valves than this. Hopefully my concerns are unfounded, and it'll all work great.
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01-15-2018, 11:38 AM | #501 |
Drives: 2018 1ss, 2021 silverado HD Join Date: Jul 2017
Location: wny
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So all cylinders will have the ability to deactivate the valves not just four. Will it still be at the lifters or will it be at the rockers?
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01-15-2018, 12:26 PM | #502 |
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Location: Massachusetts
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Call me old school, or anything else for that matter. I’d rather my engine to simply be an 8 cylinder, no less. Get rid of the over complicated engine and torque converter programming, then charge a gas guzzler tax (at least make it an option?) Is that so much to ask? Or for that matter, maybe a cylinder deactivation system that can be shut off with a flip of a switch... wouldn’t that be a novel idea?
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01-15-2018, 12:44 PM | #503 |
I used to be Dragoneye...
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I'm confused....mostly because that's the exact same concept as AFM, right now - except at the lifters. Because the engines are OHV/pushrod.
So does this mean the new engines will be DOHC? There's something not adding up. EDIT: Found something here...sounds more like new software management, rather than hardware in the case of GM's V8s...http://www.motortrend.com/news/when-...chnologue/amp/ Current AFM-equipped V8s have just two choices...run on all 8 cylinders, or just 4...and the switchover can be jarring at times. GM's done a pretty good job of ironing out the transition, but it's still there. This new technology allows the same concept to be applied to all 8 cylinders, and manages each one individually depending on the torque demands during that single 90º rotation. The goal, is to allow the throttle to be most open with the fewest cylinders, resulting in dramatically reduced pumping losses. Apparently, a prototype Yukon 5.3L ran the EPA city cycle on just 2.4 cylinders (average over time), and up to 4 (average) on the highway cycle. A steady cruise at 70 mph required as much as 7 cylinders. What this tech does is maximize the flexibility of the traditional AFM system. So my guess is, in a pushrod engine - they'll still use the hydraulic AFM lifters. |
01-15-2018, 12:56 PM | #504 | |
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As for differences between AFM and DFM / DSF.... AFM shuts down the same 4 cylinders (two on each bank) whenever it engages. DFM can shut down any particular cylinder and any number of cylinders. There are also differences in the monitoring of the conditions that trigger shutting off fuel and air to a cylinder. This allows for it to spend more time with some number of cylinders shut down, ie more fuel savings.
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