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Thread: R18 Motor Details

  1. #1
    Registered User lkchris's Avatar
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    R18 Motor Details

    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  2. #2
    Knight-Errant 1957mpd's Avatar
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    Quote Originally Posted by lkchris View Post
    A very interesting article ...
    Indeed, so. Thank-you.

    Mark
    "Soló el que ensaya lo absurdo es capaz de conquistar lo imposible." Miguel de Unamuno 1905

    Mark - Las Cruces, NM - '17 R1200 GSA

  3. #3
    One step forward, three steps back. Pushrods? Air-cooling? Forget it.

  4. #4
    Registered User GTRider's Avatar
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    Air/oil cooled, actually—same as boxers prior to the waterheads. It may not be an engine or a bike that would entice me into a purchase, but I support it’s development and marketing if for no other reason than profits from this bike will help subsidize production of other models that hold more appeal to me personally. I like any product that helps Motorrad stay in business and producing their products that I am most fond of.

    Best,
    DeVern
    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT — 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

  5. #5
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    Pictures blurred, not interesting.

  6. #6
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by 8ninety8 View Post
    Pictures blurred, not interesting.
    Not blurred for me and it had some facts I had not read before.

    HP and torque figures were given
    It's dual plugged
    Two cams, one for each cylinder
    Even though the compression ratio is fairly low, 9.6:1, it requires 91 to 93 AKI fuel. I wonder if 91 to 93 is correct?
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  7. #7
    Registered User GTRider's Avatar
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    Pics are slow to load and clear once they load fully.

    Kevin Cameron authored the article and he’s a precise and well-respected MC tech author, so unless BMW was blowing smoke on the fuel requirements (highly unlikely) I’d consider the fuel numbers accurate. A cylinder that size means a huge flame front to deal with, even with dual intakes and plugs, and I’m sure the designers are well aware of the cruiser rider’s tendency to short-shift a torquey motor, both factors that could weigh into the fuel requirements.

    Best,
    DeVern
    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT — 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

  8. #8
    Registered User pappy35's Avatar
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    Quote Originally Posted by 8ninety8 View Post
    Pictures blurred, not interesting.
    They're fine. Give them a couple of seconds to load...

    ...or maybe get a pair of readers?
    '13 R1200RT 90th Anniversary Edition

  9. #9
    Left Coast Rider
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    Quote Originally Posted by Lee View Post
    Even though the compression ratio is fairly low, 9.6:1, it requires 91 to 93 AKI fuel. I wonder if 91 to 93 is correct?
    Giant cylinder with less-than-optimum head design (2-valve) necessitates high octane.

    But like I've said it before - there's something about the /2 that turns my crank. And I'm the last guy to have expected that comment from me.

  10. #10
    Registered User lkchris's Avatar
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    Quote Originally Posted by BC1100S View Post
    Giant cylinder with less-than-optimum head design (2-valve) necessitates high octane.

    But like I've said it before - there's something about the /2 that turns my crank. And I'm the last guy to have expected that comment from me.
    This engine has 4 valves/cylinder
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  11. #11
    Registered User lkchris's Avatar
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    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

  12. #12
    Registered User 36654's Avatar
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    BMW eta engines were OK. However, I don't recall them needing premium
    Cave contents: 16 R12RS, 13 Toyota Tacoma, 03 Simplicity Legacy, 97 Stihl FS75, Dewalt DW625 & SawStop PCS175
    1) My expectations are never low enough & 2) Incompetence is infinite ........David Brooks

  13. #13
    Debbie's Servant Lee's Avatar
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    Quote Originally Posted by lkchris View Post
    I hope there's not a pop quiz on that tomorrow
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  14. #14
    Registered User WWeldin's Avatar
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    ........oh (those letters should be capitalized, as in OH, but they keep changing back to lower case.)
    2000 R1200C, 2019 R1250RT

  15. #15
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    OH Not sure what you mean?
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