Results 1 to 7 of 7

Thread: Designing 2 bike engine (looking for idea)

  1. #1
    Join Date
    Jul 2007
    Posts
    699

    Default Designing 2 bike engine (looking for idea)

    When you design a two (2) physical bike engine, do you design this way?

    If its not possible to to do 4x4, can i dedicate right rear axle to one engine and the left rear axle to another engine by using bike differential something like this?


    Lastly, do you think i have to use one standalone ecu to power both engines?
    Or individual ecu then join the accelerator into one? Like an outboard boat motor having two engines.

    Thanks
    Last edited by BusaNostra; 10-27-2015 at 01:24 PM.

  2. #2
    Join Date
    Nov 2013
    Location
    Halifax, Nova Scotia
    Posts
    33

    Default

    Various twin-engine cars have been built, typically with one engine driving each end. Throttle and clutch pedals, and gear-shifters are typically linked mechanically, but beyond that, the ground supplies the speed synchronization between the two in absence of wheel spin. If one engine is 'sick' it will run at the same revs as the other (it has to do in absence of wheel spin), with the sicker engine running at lighter load (producing less power). Multi-engine airplanes and boats rely on manual synchronization of revs because of the fluid drive medium.

    A 4WD BEC 7 clone was built in the UK using this methodology I think (details/source forgotten). I suggest 4WD rather than AWD because there was direct no mechanical link between the FWD and RWD drive trains (beyond shared throttle pedal, etc.)

    A shared ECU would be problematic if the 'tune' of the two engines was different, as they must be at some time during their lives.

  3. #3
    Join Date
    Aug 2007
    Location
    USA
    Posts
    559

    Default

    Quote Originally Posted by Warren Nethercote View Post
    A 4WD BEC 7 clone was built in the UK using this methodology I think (details/source forgotten). I suggest 4WD rather than AWD because there was direct no mechanical link between the FWD and RWD drive trains (beyond shared throttle pedal, etc.)
    That would be the Tiger Z100WR, with two Suzuki GSXR 1000 engines and 4WD.
    http://tigerracing.com/z100.php
    Sean

  4. #4
    Join Date
    Jul 2007
    Posts
    699

    Default

    Finally I found the chain drive unit that I was looking for. This unit powered two rear shaft. The Tiger Z100 was a front and rear powered which I can't do.
    Anyway, I just saw this picture and I don't know who sells this type of unit. If you have any information, I appreciate any help.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	ripics076.jpg 
Views:	244 
Size:	61.7 KB 
ID:	9766  

  5. #5
    Join Date
    Aug 2007
    Location
    USA
    Posts
    559

    Default

    Quote Originally Posted by BusaNostra View Post
    The Tiger Z100 was a front and rear powered which I can't do.
    Actually, Tiger made three attempts at cracking the sub-three second 0-60 mark with a twin bike engined car, and the first two were using RWD - one with twin Kawasaki ZX9s and one with twin GSXR1100s. See the link posted above.
    You might want to contact them to ask about their approach to this issue on those first two cars.
    Sean

  6. #6
    Join Date
    Jul 2007
    Posts
    699

    Default

    Thanks Sean....Yeah I spoke to Laura who handles the Tiger, she said the twin engine was not in production and she can't comment on the engineering design. I spoke to one of engineer that specializing in
    bike engine drivetrain in UK http://www.westgarage.co.uk/forsale/kits/kit2.html , he said: the twin engined idea is fundamentally flawed and usually fails in the execution. The picture I posted above also a failed twin engine design.He gave me the link https://www.youtube.com/watch?v=Cs9L...ature=youtu.be
    He gave me the photobucket pictures http://s144.photobucket.com/user/fro...cs066.jpg.html

    Perhaps one reason why Tiger twin engine was not offered to public.

  7. #7
    Join Date
    Oct 2007
    Location
    Menlo Park CA
    Posts
    72

    Default

    THe other twin engine attempt I know about is from Matra, where they built a prototype "U8", using two 4-cylinders with their own cranks, joined by a chain drive of some sort. Here's a link

    http://www.rootes-chrysler.co.uk/car...nt/dev-u8.html

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •