MOPED ARMY

This is so exciting! How long until we get to see some bench test videos or even riding?! The suspense makes my tummy tingle.

Very cool. I wish I had the drive to get into something this creative. Wish I was 15 again and knew what I know now. I guess it's cool that your parent support this. I was never allowed to have anything motorized as a kid and I think that's what I have such a drive to mess with anything that runs on gasoline and propels me. Good work man. Keep it up

Looking really good

There where some quite big inclusions in the cylinder. I could have filled them with epoxy. But i didn't like it thats why I will build a new version of the cylinder. This time I won't cast it but maschine it out of a piece of round aluminium the fins are going to be welded on. The idea is from a dude I saw on YouTube who build a cylinder like that and that cylinder was fucking nice.

Nice!

If you are sprint racing you might not even need cylinder fins, just a solid billet will be enough of a heat sink that the fins on the head can handle the rest

Yeah many drag race cars (usa style) have epoxy filled engine blocks with no water, the guys that do racing with lawnmower-type engines as well use finless solid iron blocks.

You might also be able to find a small foundry near you that can pour it, it's still common in USA to have small foundries although they are going away

Yeah there are some really serious blocks that are just cast or billet machined completely solid, 3000 hp blown top fuel cars and stuff.

At the very least it's a good way to test stuff. Casting is enough of a challenge in itself, hard to engineer a part and cast it, it's like 4x as much work.

Haha yeah, 9 years and dozens of pours and I have a handful of decent parts to show for it.

The heat sink is actually a great idea, production cylinders are always thin to save metal but I wonder what a big chunky cylinder would do?

It might expand unevenly with the ports, this was a major issue designing 4t heads, but we were fighting with much smaller wall section and much higher forces. When we prototyped we would make them out of a big billet with drilled water passages and use the temp measurements to feed into the FEA for the casting design.

that reed cage is am6 right¿ It’s a hair narrower than the gila reeds. pretty important. there’s so much work in these builds it’s wicked

was this done to find the heat input from combustion?