- Gearbox is integral in block like an old mini
- Output from gearbox is single splined shaft that usually carries a sprocket
- No reverse gear at all
- If driving from this using a chain to a diff, you must have the sprocket on the rear of the engine or you'll get 6 reverse gears and no forward (yes, this is obvious)
- Sprocket is offset toward centre of engine rather than out at extreme, so you can't run it forward from here as is
There is another R1 Bug chassis, but he hangs the engine off the back and to one side (yuck) and drives it through the VW box AS WELL as the bike box (yuck).
Pics of 4 cylinder bike engine setups:
So, my idea:
- Extend the output shaft of the box far enough to clear the rest of the engine and properly support this with a bearing
- put the sprocket on the end of this extended shaft
- run a chain forward from here to a quad style diff like this one from #20: http://stuff.fredcooke.com/vw.bike.engi ... arrier.jpg
- maybe hit another sprocket, move drive back more central before going forward to diff (two chains)
As pointed out by Sean a while back, reverse can be achieved using 1st, non-running engine and the starter motor wired backward through relays. Good enough.
Fred.