MOPED ARMY

Awesome! Please keep it picture heavy and up to date for non instas.

That^ . Please .

Insta what ??? ;)

I know ... Just kidding . ;)

I don't use Instagram , like a lot of other sites I never visit .

This is awesome!

That think will rip, and I'll be first in line. I have production conections in China. Holler at ya boi.

Thanks everybody. Doug - I'm going to have it / them professionally plated & honed. I know that nikasil is actually a somewhat simple process on paper, but I know there's finesse in getting it right. Same goes for honing, so I will be working with a Pro on those aspects when we get there.

Here's a bunch of pictures, but a note on process. I read everything, all the books, weirdo Kart / Snowmobile / Jetski / RC Forums , the undisputed 2-Stroke beast designer that is Jan Thiel & his lovely Aprilia RSA engine... and try to reverse engineer existing designs to see what actually works in reality. When In doubt, I crack open Two Stroke Performance Tuning 2nd Edition by A. Graham Bell for cheat sheets.

The first cylinder I made in Seattle was basically a one-shot only art project. Which was dumb, but now I know better. This current design was figured out with math and formulas and copycatting. I drew up a port map, designed the cylinder in 3D, then produced 3D prints of the model with mold registrations already built in. I made silicone RTV molds of the ports (insides) and the cylinder (outsides). The port internals are cast in a sand/plaster mix, assembled then plugged into the mold. The mold is closed up and filled with hot wax. Basically Lost wax process from here on out.

even more pics

video: https://www.instagram.com/stories/highlights/17983612387200437/?hl=en

A dab of JbWeld and run it! ;)

You probably know this but getting the sprues as high as possible improves the fill and detail. Good luck. It's really great seeing someone else doing this. Alex and I had trouble with porosity (tiny holes on the cast that show themselves when you machine the bore). Please let us know if you solve that one. Because I plan to go with an iron sleeve, it doesn't matter to me but I would like to understand it. I won't get back to my cylinder till my airplane is done and that might take years!

Inspiring work. Even more impressed that you did this in Sketchup...look forward to seeing this rip!

Rocco, yes. Kitfox II.

For those playing at home, shrinkage is running about 2% in the thinner parts and 5% in the thicker sections. I may make some changes to the mold if improvements in the burnout process don't yield better accuracy.

Also here's a side by side look of the first test with a trashed Gilardoni I have laying around.

wow it’s a lot of work .. time you get it right all 3 girls you ever dated will be on social security...

This is crazy to me that people are saying it is a waste of time. It seems he is more into this for the process then an easy way to get an end result. I think it has been fun just watching him post his results.