Cylinder deactivation
08-01-2019, 05:58 PM
#2
Burning Brakes
Best I could locate quickly. Might or might not completely answer your question. But it is a start.
https://www.jaywolfeacura.com/variab...nagement-acura
https://www.jaywolfeacura.com/variab...nagement-acura
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pilozm (08-05-2019)
08-01-2019, 07:33 PM
#3
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The 3.0L V6 MDX Sport Hybrid does not have VCM.
The Variable Cylinder Management (VCM) system switches between 6 cylinder operation and 3 cylinder operation.
The VTEC installed for each bank stops opening and closing the intake and exhaust valves on the rear bank (cylinders 1-3) when the 3 cylinder mode is activated.
VTEC/Variable Cylinder Management (VCM) System Description
https://techinfo.honda.com/rjanisis/...01411_enu.html
Last edited by EE4Life; 08-01-2019 at 08:19 PM.
08-01-2019, 07:34 PM
#4
Drifting
08-01-2019, 08:59 PM
#5
On the 3.5L V6 MDX, 3 cylinders.
The 3.0L V6 MDX Sport Hybrid does not have VCM.
The Variable Cylinder Management (VCM) system switches between 6 cylinder operation and 3 cylinder operation.
The VTEC installed for each bank stops opening and closing the intake and exhaust valves on the rear bank (cylinders 1-3) when the 3 cylinder mode is activated.
VTEC/Variable Cylinder Management (VCM) System Description
https://techinfo.honda.com/rjanisis/...01411_enu.html
The 3.0L V6 MDX Sport Hybrid does not have VCM.
The Variable Cylinder Management (VCM) system switches between 6 cylinder operation and 3 cylinder operation.
The VTEC installed for each bank stops opening and closing the intake and exhaust valves on the rear bank (cylinders 1-3) when the 3 cylinder mode is activated.
VTEC/Variable Cylinder Management (VCM) System Description
https://techinfo.honda.com/rjanisis/...01411_enu.html
I wonder how both are rated for the same 27 mpg highway when the Hybrid is running on all 6 cylinders and weighs quite a bit more.
08-01-2019, 09:41 PM
#6
the hybrid does not weigh a whole lot more - wish it did to have more battery
at highway speed you can get entire ICE cutoff with hybrid - that's how
at highway speed you can get entire ICE cutoff with hybrid - that's how
08-02-2019, 05:39 AM
#7
mrgold35
The sport hybrid does have engine Auto Stop/Start that can act like a 6 cylinder VCM with the 3 electric motors adding power as needed. Usually on declines and under 65 mph from what I've seen so far.
The smaller fwd 3.0L engine + 7DCT + 3 electric motors with the ability to add instant electric max tq up to 2000 rpms really helps with consistent mpgs. I would put sport hybrid ahead of the 3.5L sh-awd if VCM can't be used at 75-80 mph, hilly terrain, or constant speed changes. My rpms are around 1800-2150 at hwy speeds up to 80 mph to take advantage of max electric tq as needed.
I wish the sport hybrid had an plug in option to top off battery and larger battery pack to increase EV time and range.
The smaller fwd 3.0L engine + 7DCT + 3 electric motors with the ability to add instant electric max tq up to 2000 rpms really helps with consistent mpgs. I would put sport hybrid ahead of the 3.5L sh-awd if VCM can't be used at 75-80 mph, hilly terrain, or constant speed changes. My rpms are around 1800-2150 at hwy speeds up to 80 mph to take advantage of max electric tq as needed.
I wish the sport hybrid had an plug in option to top off battery and larger battery pack to increase EV time and range.
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08-03-2019, 11:23 AM
#8
Instructor
Just curious . . . do you guys FEEL or HEAR when VCM activates?
I'm sure I have VCM on my 2015 Tech AWD, but I don't feel or hear anything when or if it kicks in. I just assume it's working when cruising on city streets but the MPG jumps to above 25. Or when the RPM drops below 1500 when supposedly in top gear, am I correct?
I'm sure I have VCM on my 2015 Tech AWD, but I don't feel or hear anything when or if it kicks in. I just assume it's working when cruising on city streets but the MPG jumps to above 25. Or when the RPM drops below 1500 when supposedly in top gear, am I correct?
Last edited by Sparky16; 08-03-2019 at 11:29 AM.
08-03-2019, 06:49 PM
#9
Just curious . . . do you guys FEEL or HEAR when VCM activates?
I'm sure I have VCM on my 2015 Tech AWD, but I don't feel or hear anything when or if it kicks in. I just assume it's working when cruising on city streets but the MPG jumps to above 25. Or when the RPM drops below 1500 when supposedly in top gear, am I correct?
I'm sure I have VCM on my 2015 Tech AWD, but I don't feel or hear anything when or if it kicks in. I just assume it's working when cruising on city streets but the MPG jumps to above 25. Or when the RPM drops below 1500 when supposedly in top gear, am I correct?
08-21-2019, 07:54 PM
#10
On the 3.5L V6 MDX, 3 cylinders.
The 3.0L V6 MDX Sport Hybrid does not have VCM.
The Variable Cylinder Management (VCM) system switches between 6 cylinder operation and 3 cylinder operation.
The VTEC installed for each bank stops opening and closing the intake and exhaust valves on the rear bank (cylinders 1-3) when the 3 cylinder mode is activated.
VTEC/Variable Cylinder Management (VCM) System Description
https://techinfo.honda.com/rjanisis/...01411_enu.html
The 3.0L V6 MDX Sport Hybrid does not have VCM.
The Variable Cylinder Management (VCM) system switches between 6 cylinder operation and 3 cylinder operation.
The VTEC installed for each bank stops opening and closing the intake and exhaust valves on the rear bank (cylinders 1-3) when the 3 cylinder mode is activated.
VTEC/Variable Cylinder Management (VCM) System Description
https://techinfo.honda.com/rjanisis/...01411_enu.html
Yesterday I took delivery of my Sports Hybrid and the window sticker clearly highlights the feature.
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