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Old 02-02-2011, 04:37 PM
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5.7 L ECO quesstion

When the 5.7 L goes into ECO mode and cuts off 4 cyl. Does it cut off the same 4 every time or does it switch from one set of 4 to the other?
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Old 02-02-2011, 04:40 PM
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Re: 5.7 L ECO quesstion

It constantly alternates. So 4 fires, then on the next cycle the other 4 fire. This keeps wear/temp/balance the same.
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Old 02-02-2011, 04:46 PM
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Re: 5.7 L ECO quesstion

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Originally Posted by NetJunkie View Post
It constantly alternates. So 4 fires, then on the next cycle the other 4 fire. This keeps wear/temp/balance the same.
Thanks. I was hoping that was the case.
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Old 02-02-2011, 04:49 PM
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Re: 5.7 L ECO quesstion

Wow! I never thought of that. Great question! Awesome answer! Good to know..
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Old 02-02-2011, 05:04 PM
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Re: 5.7 L ECO quesstion

According to allpar:

Chrysler engineer Cole wrote: "The modern Hemi always shuts off the same four cylinders. In our duarability test cycle (150,000 customer equivelant miles driven at the 95th percentile, meaning that only 5 percent of our owners are more abusive than our testing), we have not found any adverse wear patterns." Even in 2010, five years later, there have been no reports of problematic uneven wear.

http://www.allpar.com/mopar/new-mopar-hemi.html
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Old 02-02-2011, 05:14 PM
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Re: 5.7 L ECO quesstion

Ok lol one guys says one thing and another says something different.
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Old 02-02-2011, 05:28 PM
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Re: 5.7 L ECO quesstion

Same 4 cylinders are shut down, and they are "lit' every ten seconds to keep temperatures even and plugs clean.
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Old 02-02-2011, 05:29 PM
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Re: 5.7 L ECO quesstion

I believe Voyager, and I base that on the technical details of HOW they disable the cylinders.

They do so by shutting off the oil to the hydraulic lifters of the exhaust valves, allowing the lifters to deflate, and keeping the exhaust valves shut.

If they were alternating cylinders, then at 3000 RPM they'd have to be able to inflate a lifter in .02 seconds, which is several orders of magnitude faster than they can ACTUALLY inflate.

B
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Old 02-02-2011, 06:40 PM
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Re: 5.7 L ECO quesstion

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Originally Posted by bpmcgee View Post
I believe Voyager, and I base that on the technical details of HOW they disable the cylinders.

They do so by shutting off the oil to the hydraulic lifters of the exhaust valves, allowing the lifters to deflate, and keeping the exhaust valves shut.

If they were alternating cylinders, then at 3000 RPM they'd have to be able to inflate a lifter in .02 seconds, which is several orders of magnitude faster than they can ACTUALLY inflate.

B
Why?? If you are "turning back on" 4 cly why would it matter which 4?
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Old 02-02-2011, 09:27 PM
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Re: 5.7 L ECO quesstion

Guess I'm wrong! Sorry about that. I read my answer somewhere else a while back..I think when we got our MDS-enabled Commander. Interesting.
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Old 02-04-2011, 08:56 AM
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Re: 5.7 L ECO quesstion

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Originally Posted by 2011RitterGC View Post
Why?? If you are "turning back on" 4 cly why would it matter which 4?
It is about the mechanics of it, not playing favorites of which cylinders. It is mechanically easier to do the same 4 than alternate the cylinders.
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Old 02-04-2011, 09:10 AM
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Re: 5.7 L ECO quesstion

Also there has been numerous posts. ECO doesn't always mean cylinder deactivation mode. If you are meeting the requirements of economic driving (ie getting great gas mileage) the ECO light turns on.

ECO Mode Engagement
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