Anyone know what this bike is or motor?
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Anyone know what this bike is or motor?

This is a discussion on Anyone know what this bike is or motor? within the General forums, part of the Caferacer.net Forums category; It must be some sort of big Mono class bike. I like the straight line down through the head intakes....

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  1. #1
    Senior Member nic579's Avatar
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    Anyone know what this bike is or motor?

    It must be some sort of big Mono class bike. I like the straight line down through the head intakes.





  2. #2
    Senior Member hillsy's Avatar
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    Wow - 3 spark plugs. And the valves are diagonal. That's some left of centre thinking.

  3. #3
    Senior Member nic579's Avatar
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    Found the sith it comes from.

    http://drmania.free.fr/drmania.htm


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    Senior Member nic579's Avatar
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  6. #5
    Senior Member freedomgli's Avatar
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    From what I can tell it is info on the BMR-Suzuki Supermono race bike that used a heavily modified Suzuki DR800 motor with Apfelbeck head and twin crank, hence the interest in the machine from the French Suzuki DR group you linked the images from.

  7. #6
    Senior Member freedomgli's Avatar
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    http://www.bmr-team.de/









    quote:European Season Ended

    Our European season ended with a very nice 21yr old German lady named Katja Poensgen winning the championship riding a BMR-Suzuki. She achieved this by winning 4 out of seven races with one second place & 2 DNFs.

    The BMR-Suzuki she rode is a very interesting tool. It may have started life as a DR800 motor but that was long ago & far away! It's creator is Rupert Bainzel, and apart from a lot of bottom-end work, the motor features a machined-from-the-solid top end, with an Apfelbeck type of cylinder head where the valves are arranged radially, with exhaust & inlet ports placed diagonally. As you can imagine, this calls for some hairy machining of cams, they are conically ground. It's watercooled and fuel-injected & gives over 90BHP from 741cc at 8000 & peaks at something like 9300rpm. Since this represents a BMEP figure of something in the order of 215psi it is a considerable achievement.

    Of course, this didn't happen overnight, it's taken some years to develop it to the present pitch and I know that Rupert won't even think about how much it's cost!

    Engine

    Based on DR Big Single Cylinder Four-Stroke

    Capacity

    741cc

    Valves

    4-Radial

    Spark Plugs

    3

    Camshafts

    Twin, Conical, External Belt Driven

    Carburation

    Downdraught Electronic Fuel-Injection

    Power

    94bhp @ 8100rpm

    Chassis

    Aero-Space Quality Tube And Plate Steel Frame

    Italian Supermono Championship, wins Constructor Championship and Title, racer M. Lucchiari

  8. #7
    Senior Member JPellegrino's Avatar
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    Wonder if it thumps
    "Its amazing what can be done when you don't know you can't do it" Bill Anderson

  9. #8
    Senior Member raven's Avatar
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    Damn. As a machinist and tinkerer I aspire to this.
    Bike:
    Buell X1
    Honda S90 (box of parts)
    Honda CB750C (runs)
    The Others (mostly rolling wounded)

    My collar may be a little frayed, and maybe I need a shoeshine. But nobody\'s got a mortgage on my soul. I own it. Free and clear. -Phil Lovecraft

  10. #9
    Senior Member Geeto67's Avatar
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    stupid question: why two con-rods and counter rotating cranks on a single cylinder?
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
    - Samuel Beckett
    A tool is just an opportunity with a handle
    - Kevin Kelly

  11. #10
    Senior Member Hoofhearted's Avatar
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    Have to admit I'm curious about the two cranks as well. Love the radial valves. Haven't seen that since Rudges in the 30s.
    Don\'t cry because its over. Smile because it happened

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