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Post by 190mech on May 8, 2010 19:11:21 GMT -5
I finally decided to start a project I've wanted to do for a while. A 50cc scoot with a 100cc engine,geared so it will cruise at 60 without turning a million RPM.I ordered a NCY 54mm cylinder kit for a 90cc engine,have a 45mm stroker crank on the way. Cases must be cut to fit both the larger cylinder and crankshaft. Got the engine off and mostly apart;  Here is the 50cc,70cc,and 54mm(103cc with stroker crank)cylinders;  This is how much metal must be removed for the cylinder to fit the case;  Will post more when my work schedule allows me to tinker,,, |
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Post by stepthrutuner on May 8, 2010 19:39:57 GMT -5
Cool. I think you should call this Project Echo Chamber. ;D
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Post by 190mech on May 8, 2010 20:02:51 GMT -5
Thanks Reg!I am planning on a new quiet pipe for it,want to ride un-noticed by all the anti scoot types  |
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Post by stepthrutuner on May 8, 2010 20:51:40 GMT -5
Hello Hello Hello. This is my new Big Big Big Bore Bore Bore. 
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jimh
Scoot Enthusiast
Posts: 198
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Post by jimh on May 8, 2010 21:11:49 GMT -5
Dang, that's a big pot!
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Post by 90GTVert on May 8, 2010 22:17:16 GMT -5
I'm very glad to see you getting this project underway. I have no doubt that it will be a beast with you building it.
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Post by 190mech on May 9, 2010 5:25:34 GMT -5
Thanks!I ordered the cylinder studs and shroud last night,hope to
have some time today to split the crankcase(why do they call them 'carters'?)and figure out a fixture to mount it in the milling
machine..
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Post by 2strokd on May 9, 2010 7:32:36 GMT -5
I dunno, but im looking forward to seeing this puppy run ;D! Gonna be interesting to say the least  |
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Post by 190mech on May 9, 2010 18:45:01 GMT -5
Got some time to 'make chips' today.Setup the cases in the mill to cut the cylinder mouth;  After many chips,here is what it looks like;  Here is the cylinder test fit,Whew,it fit!  Started roughing out the transfer tunnels;   Here is the cylinder in the case,ya'll think that web under the boost port needs to be cut straight down?  |
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Post by stepthrutuner on May 9, 2010 19:01:17 GMT -5
Hard to say. You say you're building a mild motor. It would very slightly decrease primary compression wouldn't it?
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Post by drawkward on May 9, 2010 19:36:36 GMT -5
Seems a little sketchy to me. How thin of a wall would you be talking here at the bolt hole?
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Post by 190mech on May 9, 2010 20:16:48 GMT -5
I have a 'stuffer' crank ordered,so that should keep the primary compression up.. Might cut a little more on that case channel,but worry about the bolt hole and case support there.Ive also seen where guys are cutting a 'scallop' out of the rear cylinder skirt to aid in boost flow.Like this; i34.photobucket.com/albums/d101/MomoMexicano/More%20Taz/CaseTuning17.jpgThe 50cc case appears to be restrictive in these areas for proper cylinder filling and I think some time spent here will make a stronger running engine.. |
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Post by 90GTVert on May 9, 2010 20:48:38 GMT -5
:drool:
You made that look easy.
I agree that you are getting a little too close for comfort to that case bolt hole if you cut it straight. I'd definitely look to alternative methods for increasing flow.
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Post by 2strokd on May 9, 2010 23:32:33 GMT -5
When this thing done its gonna be like  , and everybody that want to race is gonna be like     . And John will be  . I think this build is  And a  .  . Should be fine to cut a U in the skirt i would think? Now im gonna sit back and let the master work  |
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jimh
Scoot Enthusiast
Posts: 198
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Post by jimh on May 10, 2010 20:06:21 GMT -5
Hahahaha...............this is going to be great.
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