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Thread: 1800cc cruiser in the works for 2020?

  1. #31
    Ponch ponch1's Avatar
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    Quote Originally Posted by henzilla View Post
    But they do have four pushrods...although stubby compared to the Airheads
    No. The intake and exhaust have one pushrod each. The rockers are Y shaped to share one pushrod.
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  2. #32
    not so retired henzilla's Avatar
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    Quote Originally Posted by ponch1 View Post
    No. The intake and exhaust have one pushrod each. The rockers are Y shaped to share one pushrod.
    I am on cold medication..so a bit foggy...however

    I am fairly certain there are four, each adjuster sits at end of pushrods. when you adjust valves, you are changing clearance between the pushrods and the adjusters.

    11 31 7 688 631 VALVE PUSHROD - D=10 0.03 4

    B0000237.png

    The picture only shows one for clarity, but quantity is 4
    Steve Henson-Mod Team and SABMWRA Prez

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  3. #33
    Ponch ponch1's Avatar
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    Quote Originally Posted by henzilla View Post
    I am on cold medication..so a bit foggy...however

    I am fairly certain there are four, each adjuster sits at end of pushrods. when you adjust valves, you are changing clearance between the pushrods and the adjusters.

    11 31 7 688 631 VALVE PUSHROD - D=10 0.03 4

    B0000237.png

    The picture only shows one for clarity, but quantity is 4
    Only two. you can see from a picture in our own tech library. Two pushrods per head.

    https://forums.bmwmoa.org/attachment...1&d=1241117355
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  4. #34
    not so retired henzilla's Avatar
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    My brain is not working today

    Too many motors and pushrods are all scrambled today
    Steve Henson-Mod Team and SABMWRA Prez

    Be decisive, right or wrong.The road of life is paved with
    flat squirrels who couldn't make a decision~unknown

  5. #35
    Registered User wbrownell9's Avatar
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    Quote Originally Posted by 23217 View Post
    The new 2020 Subaru will be a smaller turbo charged engine. They will do away with both the 3.6l and the 2.5l for a smaller engine. Meanwhile BMW seems determined to make the engines larger for an aging population of buyers.
    BMW is making their car engines smaller too, at least to the extent that the last 2 digits of the model imply a larger engine than is actually installed. The 530 is not a 3.0 liter engine like you'd think, it's a turbo 2.0 inline four. 540 is a turbo 3.0 inline six, 550 is a turbo 4.4 V-8
    2016 R1200 GSA

  6. #36
    Ponch ponch1's Avatar
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    Quote Originally Posted by wbrownell9 View Post
    BMW is making their car engines smaller too, at least to the extent that the last 2 digits of the model imply a larger engine than is actually installed. The 530 is not a 3.0 liter engine like you'd think, it's a turbo 2.0 inline four. 540 is a turbo 3.0 inline six, 550 is a turbo 4.4 V-8
    Even a fullsize chevy half ton can be had with a 4cyl turbo.
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  7. #37
    Registered User lkchris's Avatar
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    Quote Originally Posted by jeffshoaf View Post
    I'd rather see a 4 or 6 cylinder water cooled boxer.
    ... or a Porsche
    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

  8. #38
    Registered User lkchris's Avatar
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    Quote Originally Posted by wbrownell9 View Post
    BMW is making their car engines smaller too, at least to the extent that the last 2 digits of the model imply a larger engine than is actually installed. The 530 is not a 3.0 liter engine like you'd think, it's a turbo 2.0 inline four. 540 is a turbo 3.0 inline six, 550 is a turbo 4.4 V-8
    Once upon a time, forced induction (supercharged or turbocharged) was considered equivalent to a displacement increase factor of 1.4. In the 1980s there was a BMW turbo car named to correspond with this ... 745 ... so 3.2.

    https://en.wikipedia.org/wiki/BMW_7_Series_(E23)
    Kent Christensen
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  9. #39
    Quote Originally Posted by jamesevans View Post
    Why pushrods? Because a 1800cc twin would explode if it revved fast?
    Pushrod heads are much more compact than similar displacement overhead camshaft configuration.
    My guess is that with 900cc on each side, this engine equipped with DOHC heads would be too wide to allow sufficient cornering clearance, unless they mount it so high in the frame that it would negatively impact the center of gravity.

  10. #40
    Registered User tanker4me's Avatar
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    62B00265-52ED-4654-99E0-745EE83DB2D9.jpeg
    The cam was moved from above to below the crankshaft on the boxers since the /5. It seems to me that having the cam back on top and the bike itself is an exercise in styling.
    Bill
    Last edited by tanker4me; 05-19-2019 at 03:49 AM.
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  11. #41
    Registered User xp8103's Avatar
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    https://www.facebook.com/BMW.Motorra...type=3&theater

    Those earlier pics don't look like this one... I still think BMW Motoraad has hired a hype man.....
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  12. #42
    Ponch ponch1's Avatar
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    Thatís just another custom.


    Sent from my iPhone using Tapatalk Pro
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  13. #43
    Quote Originally Posted by tanker4me View Post
    62B00265-52ED-4654-99E0-745EE83DB2D9.jpeg
    The cam was moved from above to below the crankshaft on the boxers since the /5. It seems to me that having the cam back on top and the bike itself is an exercise in styling.
    Bill
    Those cylinders look like Victory 106 jugs too me?
    Ron Prior {AMA member ,MOA member}
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  14. #44
    Ponch ponch1's Avatar
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    Quote Originally Posted by 71243 View Post
    Those cylinders look like Victory 106 jugs too me?
    Victory is undersquare and tall jugs. BMW will be over square and they're not so tall...
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  15. #45
    Registered User Subman's Avatar
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    Good article with details on the new R18 engine...

    https://www.cycleworld.com/bmw-is-bu...t-twin-cruiser
    Dave K.
    1971 R75/5

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