MOPED ARMY

it has been done and it works.

you sir are correct

so is an open transfer ok? like in the early puch cylinders?

I guess so since it's never really uncoverd by the piston any deeper than where the normal ports cut off... it just would increase crankcase volume and mess a little with primary compression, but that's probobly good since if another transfer is being added than a larger carb would help out alot and that extra case volume would benifit from the larger carb... brainstorm sorry...

I guess the only real questions I have are:

Should I do something with the piston skirt? (I'm thinking not since it'll just be static metal in the case moving back and forth with an open port)

and:

should I point the stream of the transfer at the head(squish band) or piston crown? (I'm guessing head since I'd just be tossing unburnt fuel out the exhaust with the port facing the piston) maybe two ports that point and converge streams aimed at the head to slow the velocity of it heading too fast out towards the exhaust?

I want to look at a three port cylinder that works well and see how it was aimed I guess...

yeah, I read that and A.G. Bell's so I guess I'll just go off of what I think I know. I was just seeing if anyone had done this before

if you mill the head almost completely flat you will have around 180 psi (i have 183) and that's with 2 base gaskets that i made myself out of thick gasket paper and no porting i was thinking about getting on a puch high comp head since the batavus head has no squish band so the head is basically useless but then it would cool not as good because of the direction of the fins on the puch head so i was then thinking a pug head has the same bolt spacing and fin pattern so i may get a high comp pug head (50cc) since its same bore almost and same bolt spacing so yah there's another "secret" i have

was the spacing of your piston at TDC the same as that in my picture? mine is only on there with a paper thin gasket and light sealer. I can't imagine that getting 180 psi. although I haven't tried it yet, so I wouldn't really know. haha

I was thinking of milling the cylinder so the dome of the piston crests a bit out of the jug and then using a tomos head since it has a small squish band and has fins aligned for angled placement

oh, that's also with running a head gasket

i have a puch "lo torque" head on that i milled down almost to the fins, with worn out rings (seriously the piston is scarred from bouncing around) im getting about 100-120 psi.

it heats up like a motherfer tho, use at least a b7hs. Im interested to see a picture of this third transfer port tho :O

Weird, I've never seen a moped piston that didn't come nearly flush with the top of the cylinder.

so I'll try it

sounds like a cool looking plug, yah i dont know how you al are getting that low compression, stock my other bat got like 120 psi 600 miles on odometer

Maitland, loose, worn out rings do not dissipate heat as well to the cylinder walls, and can cause overheating. Getting rings and a piston that fit correctly will solve the overheating.

ummm... that runs?

huh- that would be one way to use a cylinder with a cracked sleeve I have sitting around.

it's probobly running "not well" because you added like 10-15cc to you primary compression ratio right? and I'm not trying to knock on your handy work but the porting does look a bit jagged so turbulance is probobly a factor aswell... but thats awesome ethat that runs! it gives me some hope! thanks dude

Yeah, Hippy. It was more of an experiment. I really have no idea what I am doing. Keep posting, maybe it will inspire me to keep my purple piece of shit!

Hummm, I have a 15:15 but I don't want to deal with making the intake. Thanks Matey!