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Thread: BMW shift-cam technology

  1. #31
    Registered User AKsuited's Avatar
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    A video review of the new shift-cam GS:

    My fleet: 2015 R1200GS, 2017 Toyota Prius Prime (plug-in hybrid)

  2. #32
    Knight-Errant 1957mpd's Avatar
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    Great Vid

    That answered all my questions. The big point, at about 4:30, "Is the R1250 a big enough step to make it worth making the jump off a R1200GS/GSA?", he answered - at least from their perspective. Thanks for loading this so soon.
    "Soló el que ensaya lo absurdo es capaz de conquistar lo imposible." Miguel de Unamuno 1905

    Mark - Las Cruces, NM - '10 K1300S and '17 R1200 GSA

  3. #33
    Addicted to curves azgman's Avatar
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    Excellent review!
    MOA #107139
    RA #28511

  4. #34
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    Quote Originally Posted by 1957mpd View Post
    That answered all my questions. The big point, at about 4:30, "Is the R1250 a big enough step to make it worth making the jump off a R1200GS/GSA?", he answered - at least from their perspective. Thanks for loading this so soon.
    I want to wait for the Dual Shift Cam where the VVT is on both the intake and exhaust sides. This one is half-baked IMO.

  5. #35
    Left Coast Rider
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    Quote Originally Posted by vcheng View Post
    I want to wait for the Dual Shift Cam where the VVT is on both the intake and exhaust sides. This one is half-baked IMO.
    I think you might be waiting awhile. As well, this isn't so much VVT as its Variable Valve LIFT and I don't know many vehicles that have it on both intake and exhaust valves.

  6. #36
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    Quote Originally Posted by BC1100S View Post
    I think you might be waiting awhile. As well, this isn't so much VVT as its Variable Valve LIFT and I don't know many vehicles that have it on both intake and exhaust valves.
    I would still think that would be the next step technologically.

  7. #37
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Seems like things are getting mo' complicatederrr





    om
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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  8. #38
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    BMW is not the only sliding cam. Look at this

    https://sandyblogs.com/techlink/?p=10221

    GM is doing it too, and has cylinder deactivation too.

    Rod

  9. #39
    Quote Originally Posted by ragtoplvr View Post
    BMW is not the only sliding cam. Look at this

    https://sandyblogs.com/techlink/?p=10221

    GM is doing it too, and has cylinder deactivation too.

    Rod
    Washington Ironworks Diesel (tugboat engine) had it in 1934:

    https://m.youtube.com/watch?v=ebvD1RnX7LY

    ... both intake and exhaust!
    -I just wanna ride on my motor sickle-

  10. #40
    Registered User wbrownell9's Avatar
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    Quote Originally Posted by BC1100S View Post
    I think you might be waiting awhile. As well, this isn't so much VVT as its Variable Valve LIFT and I don't know many vehicles that have it on both intake and exhaust valves.
    They can grind whatever lift and timing profile they want on each of the four lobes per cylinder (2 low, 2 high). They already tell us that vary the timing between valves on the low speed lobes, one opens before the other. So there's no reason not to vary the whole shebang - timing, lift, and duration - between the two regimes.

    BMW cars have infinitely variable timing and lift on the intake, and infinitely variable timing on the exhaust (not sure about lift).

    I'm sure they did a cost/benefit analysis and figured that the best bang/buck was two cam profiles on the intake side. Doubling the cost & complexity for the exhaust side wasn't worth it. And frankly, you could explain the horsepower increase just on the displacement increase alone. So I'd argue that they did it to reduce emissions at low speed (Euro 5), as a side benefit got a little more torque at the low end, and decided that wasn't really enough to differentiate it so they took the opportunity to bump the displacement (it's been 1170 cc since 2005) because they have to have something to market and HP sells. I see they've changed to a "silent" chain to drive the cams, so maybe the engine doesn't make as much mechanical noise. That's a nice upgrade.
    2016 R1200 GSA

  11. #41

    camhead

    Quote Originally Posted by AKsuited View Post
    .
    When does the Camhead Form start ?

  12. #42
    Old and Tired Gillie Dog's Avatar
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    Quote Originally Posted by csargent View Post
    When does the Camhead Form start ?

    Year 2010 I believe.

    GD
    (New to me) 2010 R1200RT after HD Electra Glides for 35 years

  13. #43
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    The leaked S1000RR info states it has ShiftCam technology to help provide the now 207 Hp.

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