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Chainsaw bike

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Unread postAuthor: Crna Legija » Wed Sep 14, 2011 7:29 pm

ramses wrote:Don't ignore the need for an overrun clutch. Otherwise, if you close the throttle and coast, you may have lubrication issues.


Don't most bikes have bearings that let you coast with the petals still, I think if you keep the stock rear wheel and gearing in them that wont be a problem.
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Unread postAuthor: ramses » Wed Sep 14, 2011 7:35 pm

Crna Legija wrote:
ramses wrote:Don't ignore the need for an overrun clutch. Otherwise, if you close the throttle and coast, you may have lubrication issues.


Don't most bikes have bearings that let you coast with the petals still, I think if you keep the stock rear wheel and gearing in them that wont be a problem.



Yep, wow, I completely forgot about that. :oops: :oops: :oops:

I'm curious how you would leave the pedals operable with the engine. I guess you could switch the chain between the engine socket and the pedal socket.
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Unread postAuthor: dewey-1 » Wed Sep 14, 2011 9:26 pm

Must run in a 4 year cycle!

http://www.spudfiles.com/forums/help-wi ... 11395.html

Ever wonder why these projects never seem to get finished or even some pictures posted with success?
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 14, 2011 11:36 pm

dewey-1 wrote:Ever wonder why these projects never seem to get finished or even some pictures posted with success?


Teh sexeh blondes are distracting?
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Unread postAuthor: jrrdw » Thu Sep 15, 2011 6:33 am

ramses wrote:
Crna Legija wrote:
ramses wrote:Don't ignore the need for an overrun clutch. Otherwise, if you close the throttle and coast, you may have lubrication issues.


Don't most bikes have bearings that let you coast with the petals still, I think if you keep the stock rear wheel and gearing in them that wont be a problem.



Yep, wow, I completely forgot about that. :oops: :oops: :oops:

I'm curious how you would leave the pedals operable with the engine. I guess you could switch the chain between the engine socket and the pedal socket.


The ability to coast comes from a ratchet drive mech. on the rear axle. A/any 2 stroke engine will not burn up idling, they are getting all the lube they need for the immediate engine speed presuming the gas mix it right.

If I my self were building this project I would get rid of the bike crank and mount the engine near the bottom center as possible then run the rest of the hook ups and add foot rest/pegs.
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Unread postAuthor: stuffbuilder » Thu Sep 15, 2011 12:21 pm

I'm curious how you would leave the pedals operable with the engine


At first I was just going to run a second chain from the gearbox down to the wheel sprocket and never shift to that gear, but now I'm realizing that would cause the engine to also drive the pedals as if I were pedaling 30mph.
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Unread postAuthor: Technician1002 » Thu Sep 15, 2011 12:25 pm

jackssmirkingrevenge wrote:
dewey-1 wrote:Ever wonder why these projects never seem to get finished or even some pictures posted with success?


Teh sexeh blondes are distracting?


I don't think that one will pass as a moped. I don't see any way to pedal that one.. the bike I mean. :roll:
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 15, 2011 11:26 pm

Technician1002 wrote:I don't think that one will pass as a moped. I don't see any way to pedal that one.. the bike I mean. :roll:


Pedalling, perhaps not, but I can picture riding both :D
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Unread postAuthor: stuffbuilder » Fri Sep 16, 2011 7:45 pm

New plan: I'm attaching a separate sprocket to the other side of the wheel that will be dedicated to the engine. The problem now is how will I attack a 9-tooth sprocket to a chainsaw clutch? I thought the chainsaw chain hooked onto the outside of the clutch, but I just realized it hooks up between the clutch and the saw body.
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Unread postAuthor: stuffbuilder » Tue Sep 20, 2011 9:37 pm

Ok so I finally got a saw to use. Its a 46cc Craftsman.
Image
Hopefully this isn't too much power for a bike; I would have gone with a smaller engine, but this one was actually cheaper than most of the smaller ones
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Unread postAuthor: Crna Legija » Wed Sep 21, 2011 1:52 am

I think the bigger on is better now you can gear it down if need be and get more torque.
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Unread postAuthor: stuffbuilder » Wed Sep 21, 2011 10:32 am

The problem is that I don't know how much to gear it down. I estimated 24:1, which will make it go about 35mph at full throttle, but I'm not sure if that will give it an unneccessary amount of torque.
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Unread postAuthor: ramses » Wed Sep 21, 2011 8:46 pm

stuffbuilder wrote:Hopefully this isn't too much power for a bike


No such thing :D :D


As far as gearing goes, you need to think about the max top speed you want, and find how fast (in RPM) your wheel needs to go. Then compare that to the redline RPM of the engine. The ratio is the gear ratio you need.


If you gear it too much, you'll accelerate faster, but will hit the redline before you want to. If you gear it too little, you'll accelerate slower, and never actually reach full power (or have the ability to go faster than what you deem safe) If you preserve the derailleur system, do the calculation in the highest gear (smallest back sprocket)
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Unread postAuthor: stuffbuilder » Wed Sep 21, 2011 9:38 pm

I won't be hooking it up to the derailleur, I'll be hooking it up to a separate sprocket on the other side of the wheel.

And how does a centrifugal clutch behave at different rpms? I know that at speeds just higher than engaging speed they tend to slip more than at redline but that's about it.
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Unread postAuthor: MisterSteve124 » Thu Oct 06, 2011 1:50 pm

dewey-1 wrote:Must run in a 4 year cycle!

http://www.spudfiles.com/forums/help-wi ... 11395.html

Ever wonder why these projects never seem to get finished or even some pictures posted with success?


I actually did finish it, and it worked. Problem was I didn't really think about the proper gear ratios until the end and the clutch got burned out. Let me know if you have any questions, but you seem like you're going in the right direction
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