Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

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

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

I am hoping to get the engine running by April

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

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

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

Thanks

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

Looking really good

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Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Yeah don't be scared to skim coat that porosity with epoxy. There is no shame in that game.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

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.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

This is a german video.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

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

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

Interesting odea never thought of that.

But i want to race pffroad so thats why i will use fins as a race takes more than 3 minutes.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

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

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

Didn't know that there were dragracers with no cooling.

An yes i could get it cast, but i also do really want to eo it myselfe.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

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.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Hang in there. I'm retooling my project completely due to persistent flaws in over a dozen attempts.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

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

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Sander Mulder /

I would use fins, or maybe a computer heatsink to screw on the side?

Old kreidler/mahle cylinders are great material to melt and cast.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

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.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

I know that mahle cylinder material is great the problem is, that even very destroyed mahle cylinderes are very overpriced in germany. By the way i am not going the route of mashining the cylinder instead of casting it.

I also received a mallossi reed today.

And I made an insta account where I should hopefully make more updates on the engine.

It is called 50cc_dev

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Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

todd amundson /

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

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

That is a vl6 reed I believe that's for tye am6. These are also used in some other reed simson builds.

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

> Graham Motzing Wrote:

> -------------------------------------------------------

> 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.

was this done to find the heat input from combustion?

Re: The 2nd most powerful 50cc engine. (Casting a cylinder)

Kilian Münscher /

I will use fins out of 3mm aluminium that are weleed on.

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