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  #1 (permalink)  
Old 08-12-2007, 11:52 PM
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Homemade "mini" 8 cylinders engine and crazy idea for a scooter chopper

Hey peoples
I'm dont know where to post this, so i just post it here
I'm starting a my first "chopper bike like" machine, I am making it out of neighborhood junk such as childrens bike, scooter, wood, and etc. I bought 8 chainsaw engine from all over my town. They all work ok, I tried each on my skateboard, it seemed to go the speed about 20 - 35 mph. But I wanted to make a powerful engine out of it so i am thinking combining them all in one. it like a v8 engine (i guess) i could not afford bigger engine, so im hoping that v8 engine could push me me faster. Is this is possible to do? combining all 8 chainsaw engine in one?

I'm not sure of making a custom frame out of a old bike and a kick scooter, I could not find a good welding set.... Any one know where i can find a cheap welding set?

I been reading at some site, i just thought out something. If i attach the engine straight to the wheel it wont able to idle when the engine is on. Can any one help me on this one?

Thanks, Nick

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Last edited by amanofgreatevil; 08-12-2007 at 11:55 PM. Reason: not sure if this the right site to post this
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Old 08-13-2007, 12:55 AM
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use an old motorcycle engine/trans
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Old 08-13-2007, 01:06 AM
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humm i was going too, but are they a little dangerous than newer ones? And more complicated?
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Old 08-13-2007, 01:38 AM
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Well Nick, I certainly have to admire your "out of the box" thinking. Is it possible? Yes, anything is possible given enough money and time.

The idling problem could be solved using a Salisbury drive. Do a google search to learn how they work. Junior dragsters use 'em, snowmobiles use 'em.

As viewed from the side, the motors could be stacked into a circle. Divide the circle into 9 parts, so that each motor would be 40 degrees from the other one around the circle. On the ninth position, mount a jackshaft. Each motor would have the same size chain sprocket attached to the crankshaft. The sprocket on the jackshaft would be whatever was needed to drive the driven pulley of the Salisbury drive system. Whether the cranks were on the left or right side of the vehicle would be determined by the rotation of the crankshafts. Mount the jackshaft in a slotted plate so the motor chain tension could be set.

Now, the only question left is how do you start the motors. I doubt you could pull the cord on one of them and have enough hiney on your backside to pull all 8 of them through compression. You could of course use an Indy-type plug in starter like the Junior dragsters use and plug it into the jackshaft.

Anyway, it's fun to try to figure this stuff out and make it work. The good Lord knows I've done some backyard engineering in my time too.

Talk to others about it before you commit to the build. You might decide it will cost too much money for the return you'd get, although I'm pretty sure you'd get some press with it.
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Old 08-13-2007, 04:34 AM
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Before you try all 8 try linking 2 engines together..the snowmobile drive idea is a good one.or with only 2 engines perhaps a centifugal clutch like we used on go-karts might work....Harbor freight has some cheap welders that you can get and practice with..Too bad the schools do not offer shop classes any more..Or maybe there is a shop class in your area you can go to..

Good luck


Sam
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Old 05-16-2008, 08:06 PM
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search u-tube - there are several multi chainsaw motor bikes on there........
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Old 05-16-2008, 09:50 PM
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^ Isnt there a 36 engine one on there?

Shane
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Old 05-17-2008, 08:29 AM
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http://www.youtube.com/watch?v=DDWqJe1dCgY
This is just madness!
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Old 05-17-2008, 09:01 AM
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Holy guacomole, Weirdbeard!!

That thing is real.

http://www.dolmar.de/aktuell/dolmette/

http://www.dolmar.de/aktuell/dolmette/technik.html

Now where is Killerformula?...he spricht das Deutsche.


later, mikey
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