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  1. #1

    Default Cylinder Reduction Feature on 2007 Suburban

    Does anybody have any information re: the cylinder reduction feature on the new 2007 Suburbans? I have heard that GM tried this about 10 years ago and it failed big time. I want to get a 2007 but am a little hesitant about the quality of this new feature and how it will perform. Any thoughts?

  2. #2

    Default

    Get the next years, if 07 is the first get the 08 buy then they should have it right, hopefully.

    I thought they did it in the 70ís or 80ís.

    I was working for GM back then and remember Caddy having the V8/6/4.

    But technology has come a long way in 30 years, I hope it does work. It would be great to drive a Burb with highway mileage in the 30 mpg range. :mrgreen:

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesnít.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

  3. #3
    Sr. Apprentice
    Join Date
    Apr 2006
    Location
    Pacifica, CA
    Posts
    56

    Default

    I'm still reeling from the sluggishness of my old 86 Suburban. I'd easily give up mileage for power. Will they still be offering the traditional Vortec?

  4. #4

    Default Fab

    I have a new one. Got it in December. The v4 to v8 is great! and does improve the mileage read out to 22 to 24mpg BUT any type of added load like the A/C or a lot of wind does not allow the switching to V4. I have had absolutely no problems with that end. Did have other problems and Chevy came to the plate. I had a trany that would not go into overdrive and Chevy Lemon lawed the vehicle for me. But with the interim rentals and the new one I have had no problems with the engine/trans

  5. #5
    Sr. Apprentice
    Join Date
    Oct 2006
    Location
    Sheldon, Iowa
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    38

    Default basic overview

    Well alot of research has gone into this system, and i am working for a gm dealer. basically the engine cuts fuel to four of the cylinders, then it deactivates the lifters on those cylinders via an oil control solenoid. This allows the cylindrs to act as an air spring. And yes it is very sensitive and kicks back to 8 at the slightest load increase.

  6. #6

    Default

    Quote Originally Posted by wildmans92 View Post
    Well alot of research has gone into this system, and i am working for a gm dealer. basically the engine cuts fuel to four of the cylinders, then it deactivates the lifters on those cylinders via an oil control solenoid. This allows the cylindrs to act as an air spring. And yes it is very sensitive and kicks back to 8 at the slightest load increase.
    i have the yukon xl,,,i have over 3000 miles on it,2007,,,no problems ,,2000 miles are here in mexico,,,,,on high way it moves in and out ,,,helps on gas milage,,,here in mexico i am on dirt roads and rock roads 90 percent of the time ,,,,no problems so far,,,abuelito

  7. #7

    Default

    The technology behind it has always amazed me, but I heard it was a huge flop back when they tried it the first time. Perhaps now that the computers for the motors have advanced so much, it may be able to do a better job. The thing that's always gotten me though is that, sure, you shut cylinders down, but you're still dragging that piston up and down the cylinder which creates a good bit of drag on the rest of the motor, causing the remaining cylinders to have to work harder to achive the same effect. Unless you can completely disengage the piston from the crank, then the drag I would think is so immense that a significant change is fuel economy cannot be realized.
    Christopher

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 265K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half



    There are 10 kinds of people, those who understand binary, and those who dont...

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  8. #8
    Legend
    TrailLeadr's Avatar
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    Jun 2005
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    Coventry, Rhode Island
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    3,103

    Default

    Quote Originally Posted by Crawdaddy View Post
    The technology behind it has always amazed me, but I heard it was a huge flop back when they tried it the first time. Perhaps now that the computers for the motors have advanced so much, it may be able to do a better job. The thing that's always gotten me though is that, sure, you shut cylinders down, but you're still dragging that piston up and down the cylinder which creates a good bit of drag on the rest of the motor, causing the remaining cylinders to have to work harder to achive the same effect. Unless you can completely disengage the piston from the crank, then the drag I would think is so immense that a significant change is fuel economy cannot be realized.
    That's what I always figured but if they leave the valves closed the the air would act like a spring, just like wildman92 said. Once the piston hits the bottom of it's stroke it would have negative pressure encouraging the piston to come back up, and once it hits the top it will have high pressure which will encourage the piston to move back downward.
    Kind of on the principal of the sterling engine.
    http://en.wikipedia.org/wiki/Sterling_engine
    Patrick
    Rhode Island


  9. #9
    Legend unplugged's Avatar
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    Thumbs down questionable from an investment standpoint

    FYI,

    From: http://www.fueleconomy.gov/feg/tech_...more.shtml#dod

    This website explains the underlying technology and claims that the typical savings over the LIFETIME of the vehicle is only $2000. That doesn't sound like grounds for exposing yourself to potentially expensive trouble maintaining the system.

    Trippy looking lifters that GM uses:
    There is no way to happiness....happiness is the way.:yipi:
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    High Desert SoCal
    93 K1500 burb (personal) 350 AT 3" Lift 250K+
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  10. #10

    Default

    Doesn’t someone else also have this set up.

    Toyota or Honda ?

    I’m not sure but I thought I heard they did.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesnít.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

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