MOPED ARMY

Is that plastic?

Yes thats 3d printeg pla.

I am going to lost pla cast it which means i am going to suround the plastic cylinder with plaster thaen burn the plastic ouz and cast mrtall in to the plaster.

Today the space plate for the cylinder arrived. Which will be welded onto the crank case mainly to get the extremly big space between the cylinderstuds.

Of course the plate need to be cut in half on on each half of the case. Now I am only waiting for the new liner to arrive hopefully tomorrow.

Next I am going ro carve the port in the liner and then cast the cylinder around the liner.

Can't cast the spacing into the bottom of the cylinder ?

I take by your title you are following 2 Stroke Stuffing.

I see no reason not to put some fins on the cly to pick up radiant area. Other than of course making the casting more difficult. Also, why not connect the head stud bosses to the cly sides and fare them in?

why dont you use auxiliary exhaust ports?

I notice another item. The speed of the flowing coolant in the critical areas will be based on volume it's flowing through. Perhaps the huge area on provided will have it moving very slowly around the bore.

a few holes in the head for the coolant to get through.

so... i would use your current design for the coolant, but adjust the head to it

I am thinking about the cooling around the exaust to.

I designed it that way it is at the moment manly to make it easier to cast.

On the previous casting attemps of me a was able to get good result even to wall thicknesses as low as 2mm's.

I was thinking about welding on cooling fins to the exaust afterwards.

But I will probably do a re designe.

I am using to 2 exaust port designe for two reasons.

1. Cause its easier to cast and when done correctly I should get more blowdown. But i am not sure about that.

2. Auxiliary exaust ports should have a higher power output potential. Mainly to to faster blowdown flow in the Auxiliary ports thats why I kept the exaust port bottom pretty far up and keep the size of the exaust opening quite small (80% of port area)

With bridges it shouldn't have a ring issue. I think this is really swell man.

...That captive ring setup he's working in blows my mind. Especially the Piston itself. It's such a novel design but I don't see any reason one couldn't use that Piston design with standard rings...

Certainly would have helped me out when I was starting out. I have a Piston ring graveyard around here from 20 years ago when I diddnt know how to install them correctly.

Working on the new cylinder designe.

Atm

Almost 100% of bore!!

Hope so to thanks.

I started to weld the cases.

Now I just realized that I have a problem. Because the cylinder is 90° turned the skirt of the liner is now in the way of the rotary inlet.

Yess it’s looking better!!

That cylinder looks like it made for scooter engines.

Did you fit it to a puch or was it run on a scooter engine.

I am just curios.

Of it was run on a puch du you have any

I meen the mallossi (edited)