Designing 2 bike engine (looking for idea)

[BusaNostra]

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

http://i62.tinypic.com/290wnkz.jpg

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?

http://i60.tinypic.com/35lw36v.jpg

 

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

Edited October 27, 2015 by BusaNostra

[Warren Nethercote]

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.

[Sean]

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

[BusaNostra]

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.

[Sean]

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.

[BusaNostra]

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

He gave me the photobucket pictures http://s144.photobucket.com/user/froggy_041/media/ripics066.jpg.html

 

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

[DavidL]

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-development/dev-u8.html