BlownCorona Posted September 28, 2011 Share Posted September 28, 2011 havn't met a weed eater with a clutch / all of them.... / mine dosnt. Have one bank of 5 offset one motors forward and space them a sprockets width apart so you can go over under with chain so you get maximum chain contact. i believe this is how hes doing things, if not then he should be Quote Link to comment Share on other sites More sharing options...
Yowzer Posted September 28, 2011 Share Posted September 28, 2011 why would you need to turn the cylinder? for example. a 2 stroke motorcross bike just needs a bump start backwards to run in reverse. Having pulled many 2 smokes apart i dont see a reason to turn the cyl. Just curious btw and Ned, circle or two banks of 5, two motors on common sprocket one running backwards ftw. Sometimes the piston has an offset gudgeon pin so during the power stroke it is pushing more uniformly down on the conrod and reducing lateral forces on the piston. If you run in reverse, the piston will get mashed into the cylinder wall a lot harder, creating more friction / heat / wear / less power. Rotating piston is generally a good idea if you want the engine to run backwards. Or something like that anyway. Quote Link to comment Share on other sites More sharing options...
sentra Posted September 28, 2011 Share Posted September 28, 2011 who was the volvo guy i met today who reads this thread??????????? Quote Link to comment Share on other sites More sharing options...
Ned Posted September 28, 2011 Author Share Posted September 28, 2011 I am doing that with the offset things weaving chain etc etc. p.s. my weed eaters don't have a clutch Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted September 28, 2011 Share Posted September 28, 2011 one big centrifugal clutch will work awesome if you have something powerfull enough to turn over 10 engines at ones? Quote Link to comment Share on other sites More sharing options...
anglia4 Posted September 28, 2011 Share Posted September 28, 2011 fixed drive ftw! Quote Link to comment Share on other sites More sharing options...
Ned Posted September 28, 2011 Author Share Posted September 28, 2011 Single centrifugal + scooter CVT i think.... All 10 motors linked together with car starter will work sweet i think... Quote Link to comment Share on other sites More sharing options...
KKtrips Posted September 28, 2011 Share Posted September 28, 2011 Don't have too much chain contact area - too much drag and you will lose heaps of power - its toothed so you will only need 3 or 4 teeth per motor in contact at most. (I'm not an engineer but makes sense to my simple mind) Quote Link to comment Share on other sites More sharing options...
Steelies Posted September 28, 2011 Share Posted September 28, 2011 ^agree i have chain sapping clydesdales issues. Quote Link to comment Share on other sites More sharing options...
Ned Posted September 28, 2011 Author Share Posted September 28, 2011 hopefully i can adapt this to suit... $15 so who cares if i doesnt Quote Link to comment Share on other sites More sharing options...
Ned Posted September 29, 2011 Author Share Posted September 29, 2011 Motors clean, thanks John! Took me 2 hours to blow all the remaining water out of them though but gave me the opportunity to inspect the insides of all the motors. CUTE! I took the primer pump mounting off while i was at it to be able to mount the motors closer together Cleaned the plugs too, as this one looked POOS! and this was after an initial brush with kero too :/ Took 5 of the cabs apart a few days ago and soaked them in kero as well. Put them back together tonight too. Was actually a lot of fun puzzling them back into 1 piece lets hope they still work/work better. Just some of the main bits and 5 nicely reassembled carbs p.s. are these image sizes ok for everyone? as i can make them any size by editing the link (Picasa is sweeeet) like so (pic from bike summit) 480 640 800 1024 1 Quote Link to comment Share on other sites More sharing options...
Simon Posted September 29, 2011 Share Posted September 29, 2011 Just in case you guys wanted it at 3000x2300 yu'know... Oh and 6200x4500 You never know. (open in new tab to see full so you can save it etc). Thx Quote Link to comment Share on other sites More sharing options...
Ned Posted September 29, 2011 Author Share Posted September 29, 2011 lol, you got me. I really just wanted to post some bike summit pics as motiation oh, and OS limits the sizes to 1024 so any bigger is pointless Quote Link to comment Share on other sites More sharing options...
felixx Posted September 29, 2011 Share Posted September 29, 2011 this thing gets my sphincter twitching - in a good way! Quote Link to comment Share on other sites More sharing options...
Steelies Posted September 29, 2011 Share Posted September 29, 2011 itching to see this come together also, cant wait for the sound! Quote Link to comment Share on other sites More sharing options...
bdm Posted September 29, 2011 Share Posted September 29, 2011 who was the volvo guy i met today who reads this thread??????????? That Would be me Quote Link to comment Share on other sites More sharing options...
Ned Posted September 30, 2011 Author Share Posted September 30, 2011 Glad you lot are enjoying it so far Another small update; Will be trying to get them all running this weekend so to not give myself a dead arm, i decided to make up an electric start. Went out and bought a nice freewheel BMX rear sprocket to use the sprag clutchyness of it, but turns out starter motors already have one... a proper one and not the lame clicky one thats in a BMX sprocket. So got a 2J starter motor from Ryan (cheers buddy!) "Ned likes this" and machined up a sleeve to go over the started motor gear and over a 1/2" drive extension. This was to be welded onto both ends but due to the level of intoxication, the holes weren't quite the right side and there is a little play in them. Not enough to piss me off too much, but enough to be annoying to get straight. Plus can't get the welder into the starter motor side as the housing is in the way so will grub screw them into place tomorrow and hope that works. Some pics of course; And i drew up how i want to mount the motors. (click to enlarge) 6 motors on one side and 4 on the other. That is to make it easy to run the chain and give me some room to permanently mount a starter motor on it Rough size is 600x400 without the final drive gear mounted to it (centrifugal + CVT?) so not too large really. Will likely mount the motors closer together but want to see how large the sprockts are and how well the chain runs between them at different spacings etc. 1 Quote Link to comment Share on other sites More sharing options...
Guest Posted September 30, 2011 Share Posted September 30, 2011 I'll be following this with interest. Reminds me of this on a smaller scale. Awesome work! DDWqJe1dCgY Quote Link to comment Share on other sites More sharing options...
Ned Posted October 6, 2011 Author Share Posted October 6, 2011 Got the electric start working just fine as_E1gIOUxQ Only got 5 motors going so far, but thats 5/5 motors i've tried so thats fine. Still need to reassemble the carbs from the other 6. Spent $175.49 on sprockets but the guy who i dealt with was awesome to deal with and extremely helpful! Craig from Supply Services. So will hopefully get to machine out the sprockets so they fit on the shafts tonight and start designing the plate that holds the motors Also picked up a 2 speed scooter box but the centrifugal clutch is missing so will have to hunt down another one. Not sure if i can actually mount the 2 speed box anywhere, but i'll sure try! Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 6, 2011 Share Posted October 6, 2011 Mmmmm sprockets. Quote Link to comment Share on other sites More sharing options...
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