turning the jug

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blue 48

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hi again
is it possible to rotate the whole cylinder bore 180degrees and will it run?
i know the goemetry will be unsuitable for a bike but thats not an issue to me. itll be going on a scooter im making:eek:

i hope it does work bearing in mind im making my own exhaust and inlet.:unsure:
 
It should work.(what engine are you talking about?)
Just remember, this will make your exhaust exit at the rear of the engine, and your carb will be at the front of the engine.
they used to do this on Triumph motorcycles back in the day for drag racing. Having the carbs in front gives ram air effect.
I'm not sure if it's just as simple as spinning the jug around, or if there's more to it than that.
 
hi motopsycho its the 48cc ht, it looks like the transfer ports may be an issue from what im looking at now
 
As far as the exhaust/intake ports the distance from the bottom of the cylinder are the same (at least on the engine I just measures 66cc).
But as far as the gasket (transfer ports)...well I'll let you decide.

Stock gasket placement.


Reversed gasket


So I'm going to stick my head out and say NO, as I feel that there would be too much of a restriction of fuel mix supplied to the combustion chamber.
 
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hi again
is it possible to rotate the whole cylinder bore 180degrees and will it run?
i know the goemetry will be unsuitable for a bike but thats not an issue to me. itll be going on a scooter im making:eek:

i hope it does work bearing in mind im making my own exhaust and inlet.:unsure:
I know of 3 guys that have successfully built 180 rotated cylinder 66 cc
motorized bicycles.
I have ridden one of them and the bike runs great. The owner raced it at the last
2 SoCal Motor Bicycle races and has built at least 4 rotated jug bikes.

Turn the piston and jug 180 and just match the transfer ports with a dremel
rotary grinder. That is all that it takes.
 
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I thought about opening the transfer ports when I took those pictures today. But thought that there isn't that much base thickness to do it. Since you know or those that have.. then he could go for it. If he does, keep us posted.
 
Not the best pic.
 

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yeah, id say its possible.

better than a dremel, get someone to fill up the ports with weld then dremel for perfection. (like me, with my ali TIG :giggle: )

i wouldnt do it to a HT, too unreliable as they are. wasting 6 hours+ of work is depressing.

spin the piston at the same time to reduce chances of ring ends going out the port.
 
welllll.... i asked a friend who does one off casting and machine work for us the same thing

but i asked if he could remanufacture it from scratch so the transfer ports are the same but reverse the inlet/exhaust ports while maintaining the port timing and size of the origional jug, he grabed his measuring tools checks a few things ,looks at me with a grin and asked how many do ya want !!!!
so long story short 2 bottles of jack daniels and 3 weeks time ill hopefully have 2 new reverse port jugs coming my way


this guy is great , his work is fantastic and spot on he a retired engine builder and machinist that over the years made some very wise choices in life which saw him with some really neat cars, bikes, workshop equipment and property. he loves the little hts he says theyre the simplest and most perfect example of how the 2 smoke engines work


camera working now PHOTOS SOON:unsure::unsure::unsure:
 
thats AWESOME!

you could have the ports tweaked regards shape and size at the same time and make a screamer!

just be aware that they will need either a CAST IRON sleeve/liner, or chrome plating.

having experienced chrome plating of alloy, i recomend the liner method.

if hes good he will make liners, and cast the cylinders around them... :)

updates required when done :)
 
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