just a few questions before i start building

I'll vouch for the "no-sidewall" recommendations. I tried building one about a dozen years ago or so. Perhaps I could have even made it work, except that the slightest slippage ruined tires in an instant.

The OP is talking about contact with the wheel sidewall, I realize. But the tolerances will be tight. Anything less than perfect adjustment will mean contact between the drive and the tire sidewall.

Maybe it can still be done, but it'll require zero contact.
 
ya i think i will try it on the rim thanks sorry my computer is messed up so i can't watch videos right now so that is why i asked thanks also i am thinking of using a disk brake thing for it to rub on instead of the rim any ideas
 
i don't really know where to get a roto-tiller gearbox or how to hook it up much less mount it but if you could give some advice i might think about it there is something like that on the lawn mower i got the engine from it used a belt off the engine shaft above the blade and made the front wheels turn but that will be really slow
 
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one possibility might be a roto-tiller gearbox. This would rotate the drive axis by 90 degrees, and reduce the RPM so that it's near what the rear wheel needs to be at. However, there are some disadvantages...
  1. power loss in the gearbox
  2. The need to add a clutch. A centrifugal, or even a belt clutch could be added before the gearbox, or, a belt-clutch after it.
  3. The weight of the gearbox
  4. Complexity of the solution

Here's two other possible approaches:
  • One member has modified a vertical shaft engine to the horizontal by swapping the oil dipper (splasher,) inside the crankcase.
  • A couple of members have advocated a vertical engine friction drive. Using a pair of rollers (an idler on one side of the tire, and the friction roller on the other. On the surface, this will work. However, a vertical drive roller will contact the tire in the sidewall, where it's the thinnest, AND, the roller is against the tire at a range of diameters from the axle. This means that the roller will have a scrubbing action against the tire, as at a given RPM, the portion of the roller farthest from the axle will try to drive the wheel faster than the portion nearest the axle. This will lead to additional friction and wear, and, unfortunately, it's where the tire is least able to handle it. Who wants a sidewall blowout??? It would probably happen when you're stressing the tire sidewall more than usual (i.e. - in a turn...) Can you say 'Wipeout?'

That is just plain, dang brilliant! I wish I had thunk 'o dat! I really did search a lot and the worm gears I found were crazy bucks expensive. Easy to change the ratio via the drive shaft pully or sprocket. Good Job Loq, thanks!

The lawn mower engines coming out of late would (will) make really great looking rack mounts! (And work awesomely) Replacement vertical shafted lawn mower engines are mass produced and cheap. Look cool and will work great! Win, win, win.
 
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That is just plain, dang brilliant! I wish I had thunk 'o dat! I really did search a lot and the worm gears I found were crazy bucks expensive. Easy to change the ratio via the drive shaft pully or sprocket. Good Job Loq, thanks!

The lawn mower engines coming out of late would (will) make really great looking rack mounts! (And work awesomely) Replacement vertical shafted lawn mower engines are mass produced and cheap. Look cool and will work great! Win, win, win.

Here's one I did last year. Honda GX25 into a generic Home Depot minitiller gearbox. It went 20-22 mph @ about 240 mpg. Got 27 mph out of it once on a downhill, but it didn't like it. :devilish: Ran fairly trouble free for about 1800 miles.

If you put a generic kart clutch on the crankshaft and a matching sprocket on the tiller gearbox shaft, and coupled then with a 2-40 chain (the double stuff) it would work. Maybe a little cumbersome, but no worse than some of my contraptions. :D

Denny
 

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That would be

A good engine for a pusher trailer.. check them out !!!
Kinda Cool...
 
That is just plain, dang brilliant! I wish I had thunk 'o dat! I really did search a lot and the worm gears I found were crazy bucks expensive. Easy to change the ratio via the drive shaft pully or sprocket. Good Job Loq, thanks!

The lawn mower engines coming out of late would (will) make really great looking rack mounts! (And work awesomely) Replacement vertical shafted lawn mower engines are mass produced and cheap. Look cool and will work great! Win, win, win.

sorry dan i am a little confused on what you are talking about care to explain
 
ibdennyak where could i get a gear box that would be easy to put together and not make me lose to much power also has anyone ever thought of doing a vertical engine friction drive on a disk brake pad for a bike rather than on the rim or tire it seems like it might be a really good idea no tire blow outs
 
here is my plan i will have a clutch on the handlebars like a brake and it will pull the engine away form the rim and i will have a throttle control so it is not all out all the time also i will try to design something to widen the rim so that i can put the friction drive on the rim more easily rather than on the tire then there is more griping area. ALSO if anyone knows where i can possibly find some parts for a schwinn manta ray 2005 that would be great because i can't find it anywhere on the internet and the people at the local bike shops can't really help i just need the parts for a schwinn coaster brake so all the guts in the back axle the pros at the bike store said it is generic so really any schwinn coaster brake will work for mine i just need to find some on the internet so please keep your eyes peeled thanks
 
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