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Do 5.4l engines use cylinder deactivation?

Do 5.4l engines use cylinder deactivation?

 
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Old 08-21-2013, 07:23 AM
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Do 5.4l engines use cylinder deactivation?

Guy here at work says his 2010 F150 5.4 drops to 6 then to 4 to save on fuel.

Is he smoking crack or ??
 
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Old 08-21-2013, 07:27 AM
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Last edited by projectSHO89; 08-21-2013 at 07:37 AM.
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Old 08-21-2013, 09:11 AM
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Not unless you consider Fail safe mode a form of cylinder displacement. Dodge hemi is the only truck I am aware of that makes use of it.
 
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Old 08-21-2013, 09:15 AM
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That's what I was thinking.

He just bought it used over the weekend.
2010 F150 Lariat 4x4 with 48,000 for $27k
 
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Old 08-21-2013, 09:17 AM
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Dodge calls it MDS, Chevy/GM do it too. That's how they get their decent mpg numbers. The new stingray vette is going to be 30mpg highway because of this. IMO, it's cheating and the exhaust sounds like ***.
 
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Old 08-21-2013, 02:09 PM
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I wouldn't think the exhaust note would change much. The non-firing cylinders still inhale and exhale air at the same rate the firing cylinders do.
 
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Old 08-21-2013, 05:11 PM
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Originally Posted by twinskrewd View Post
I wouldn't think the exhaust note would change much. The non-firing cylinders still inhale and exhale air at the same rate the firing cylinders do.
I can't comment on the exhaust note, but on my Impala SS with this feature, the shut down cylinders operate as air springs, with the valves stuck closed. That uses much less energy than inhaling and exhaling. That is, no air is passing thru the draggy valve openings. And whenever a sealed cylinder compresses the air during the up stroke, that energy is returned on the downstroke (minus some heat loss).

HTH.

Doug

.
 

Last edited by plano-doug; 08-21-2013 at 05:17 PM.
 


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