avjoe Posted September 8, 2013 Share Posted September 8, 2013 so i had a wee thing going in my city turbo thread but i thought id seperate it as it seems things are getting drastically out of hand. seems to be just the way we like it on old school! Its a old school, Velamos, kids pedal bike from Czechoslovakia. hes a pic from the auction i origionally wanted a honda express/ nc50, but there seems to be no so many around, for not my sort of price range.... lol then i remembered i had a small engine lying around, that i had bought / build for an old scooter project ages ago that i never got around to completing. and thought this would be a much better cause. specs on the engine are, -a trademe base kit. which i then bought a -larger carb -larger cylender block -larger piston -new conrod -and crank adding upto make about 88cc. needs a bit of a clean up but its pretty fucking sick i reckon. basic mock up, using zip ties, lol top bars will have to be re made, this time using round bar, the old stuff is just thin tubing. need to find a way to set up the rear wheel so the sproket is on the same side as the engine drive, its got one of those systems where if you pedal backwards it locks the back wheel, so i dont know if im going to need to do something to get around that if im flipping the wheel. also, i bought a super charger for it. el oh el. will be interested to see how i get on mounting it up, obviously there isnt alot of room, should fit nicely under the seat though. its a 'smog pump' that the yanks used on their old transams to pump fresh air into the exhaust to help pass smog tests, they are supposidly perfect for these little engines, so i may as well give it a go. ill need to pressurise the fuel, so ill run a boost line from the s/c out let to the breather on the fuel tank, then make up a reducer pipe for the s/c outlet to the carb, to make sure the carb is getting more fuel then air. oh yeah and a mate linked me to these Sooooooo... NOS is on the cards too cherio. 2 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted September 8, 2013 Share Posted September 8, 2013 Very cool. But as much as I love doing things in excess- I think at 80cc it'll already have enough power haha. You are going to die Quote Link to comment Share on other sites More sharing options...
avjoe Posted September 8, 2013 Author Share Posted September 8, 2013 I am prepared haha Quote Link to comment Share on other sites More sharing options...
avjoe Posted September 8, 2013 Author Share Posted September 8, 2013 has anyone got any tips for running in two strokes? im not to worried if it blows up either, its cheap enough to replace Quote Link to comment Share on other sites More sharing options...
Hachi-ichi Posted September 8, 2013 Share Posted September 8, 2013 Supercharged Nitroused Child's bike. Good to see you aren't doing things by halves. 3 Quote Link to comment Share on other sites More sharing options...
ODB Posted September 8, 2013 Share Posted September 8, 2013 This thing will be unstoppable at next years bike polo @ Hanmer! 2 Quote Link to comment Share on other sites More sharing options...
avjoe Posted September 8, 2013 Author Share Posted September 8, 2013 haha! itll be a wepon alright Quote Link to comment Share on other sites More sharing options...
Benno Posted September 8, 2013 Share Posted September 8, 2013 Can't beat burnouts for breaking in a new engine! Not sure how well you will get on with supercharging a 2 stroke, many have tried and failed. The main issue is that due to the 2 stroke design if you use forced induction you will end up just blowing all the extra fuel/air straight out of the exhaust. You might be better off making a tuned exhaust for it (expansion chamber). Don't let me put you off though, be interested to see how it turns out! Quote Link to comment Share on other sites More sharing options...
Llama Posted September 8, 2013 Share Posted September 8, 2013 Where did you get the supercharger from? Quote Link to comment Share on other sites More sharing options...
avjoe Posted September 8, 2013 Author Share Posted September 8, 2013 ahhhh true true. very good point. no harm in trying i guess. got it from a mate who tunes cars, took it out of a old transam Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted September 8, 2013 Share Posted September 8, 2013 supercharging will be hard, but i supose if you keep boost levels super low, like 2/3psi it might work better/be contained by the 2strokes piston porting. it also strikes me that an expansion pipe (which uses presure waves to jam the lost fuel mixture back in, might help counteract the tendancy to blow it all out the exhuast) so conclusion is, supercharged, nitroused, exhuast tuned 88cc childs bike. as if youll be strugling for power!, Quote Link to comment Share on other sites More sharing options...
AllTorque Posted September 8, 2013 Share Posted September 8, 2013 So you have a supercharger from a 5000cc+ motor for a 80cc 2 stroke? Ya reckon that'll work? 2 Quote Link to comment Share on other sites More sharing options...
felixx Posted September 8, 2013 Share Posted September 8, 2013 Alltorque its a fan that was used to 'dilute' the exhaust gases to meet emission std tests, not a huge supercharger I found a few references to this technique online with mixed results when I googled supercharging a 2 stroke AvJoe I love the concept and wish you well on it It looks haggard and angry but cute too Quote Link to comment Share on other sites More sharing options...
avjoe Posted September 8, 2013 Author Share Posted September 8, 2013 So you have a supercharger from a 5000cc+ motor for a 80cc 2 stroke? Ya reckon that'll work? Oh yes. Should make 800hp atw. Can you get me 2 of those big bottles by friday? Cheers felixx. Itll be interesting. Ill give it ago, but like many of you im unsure what the result will be Quote Link to comment Share on other sites More sharing options...
KIRK Posted September 8, 2013 Share Posted September 8, 2013 I saw a smog pump supercharged scooter on the internet once. Quote Link to comment Share on other sites More sharing options...
AllTorque Posted September 9, 2013 Share Posted September 9, 2013 Alltorque its a fan that was used to 'dilute' the exhaust gases to meet emission std tests, not a huge supercharger I found a few references to this technique online with mixed results when I googled supercharging a 2 stroke O I C. carry on then Quote Link to comment Share on other sites More sharing options...
KIRK Posted September 9, 2013 Share Posted September 9, 2013 wrong thread KK I think Quote Link to comment Share on other sites More sharing options...
avjoe Posted September 9, 2013 Author Share Posted September 9, 2013 run into problems already, cant run the motor on the piss like i intended because the carb has to be level, because of the float. Quote Link to comment Share on other sites More sharing options...
Goat Posted September 9, 2013 Share Posted September 9, 2013 make a manifold to keep motor on angle but carb level. Easy 1 Quote Link to comment Share on other sites More sharing options...
Steelies Posted September 9, 2013 Share Posted September 9, 2013 you may find the carb will clear your frame once the motor is moved to suit chain line..? Quote Link to comment Share on other sites More sharing options...
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