ESE's works engine tuner

[Grumph]

So, a heavy but solid topped looking piston. That fits in a tube for linear motion. A ridiculous amount of inlet area. Conventional transfer area but with sharp holes on the inners.
My brain hurts.

It almost looks like a return to the origins of the 2 stroke where the piston was assumed to do all the pumping work. Still trying to visualise whether the under piston pumping setup is more efficient than the usual crankcase volume. Certainly plenty of transfer volume to provide mixture and as dave notes, it's provided with plenty of inlet area too. If it's a more efficient pump, it may not need the usual triple exhaust to generate flow...
At least we can now see why it's a short rod. I'd been assuming a trunk piston as it does seem to be a wet bottom end, well it is and it isn't a trunk piston..

[Flettner]

and about a cm to the left of the yellow circle looks to be the other end of the duct you mention.

Certainly looks like an exhaust eye port. Either Ryger is wrong about one exhaust port, or, its one of the 11 transfers talked about. Assuming there is another one also on the other side of the main exhaust port.

Come on, whats the harm, it's all tied up now so just get that can opener out.

[husaberg]

It almost looks like a return to the origins of the 2 stroke where the piston was assumed to do all the pumping work. Still trying to visualise whether the under piston pumping setup is more efficient than the usual crankcase volume. Certainly plenty of transfer volume to provide mixture and as dave notes, it's provided with plenty of inlet area too. If it's a more efficient pump, it may not need the usual triple exhaust to generate flow...
At least we can now see why it's a short rod. I'd been assuming a trunk piston as it does seem to be a wet bottom end, well it is and it isn't a trunk piston..

With regards to the crankcase vs pump It might not be more efficient in BMEP terms but I muse it will allow very fast blowdown via pressure differential. Rather than duration vs time area. I would muse a Std triple is nothing much to do with better flow really at all, more to do with making the best of a bad situation. (best Compromise in a std design)

[Lightbulb]

It only has a single exhaust port. There is just a reflection in the bore from the opposite transfer port to make it look like a port.
The reed block and the crank assemble looks to be the best parts yet to be revealed. I want to see what keeps it all together at 30K
Neil

[wobbly]

And as I have said a dozen times on here, its only in lawnmowers that the dropping piston has anything to do with promoting flow
from the conventional case - thru the transfers,as there is more pressure above than there is below the piston at TPO.
The Ryger is using a very small trapped volume, that is compressed substantially by the larger diameter piston portion.
Thus it simply doesnt need a ton of blowdown to reduce the combustion pressure above the transfers, and as well it doesnt need the big negative pressure
ratio created by the diffuser to pull mixture into the cylinder when the piston is at BDC.
So a single Ex port seems entirely reasonable and expected.
The top end workings I believe we have pretty much guessed the trickery, as for the 30,000 rpm capable bottom end - darkness and guessing are really confusing
and we are not even close to reality yet.

[marsheng]

Looks like I need to raise the RPM when the centrifugal actuator comes in by 1500 RPM . I can't really preload the spring any more as that will reduce the opening mechanism travel.

There are 4 steel balls that fly out to make it all work. They are around 6-7 mm in diameter. I was wondering if using a smaller set of balls may work. I guess another option is to only use 2.

Cheers Wallace.

[RAW]

Re- the ryger
If a engine had a single main exhaust port & 2 sub exhaust ports as we have come to know but there is a very fine slot almost like a crack from the main exhaust port into the as known sub exhaust ports, this then would be a single exhaust port.

[ken seeber]

Re- the ryger
If a engine had a single main exhaust port & 2 sub exhaust ports as we have come to know but there is a very fine slot almost like a crack from the main exhaust port into the as known sub exhaust ports, this then would be a single exhaust port.

Good thought Rick, that's exactly what they do with RC cars for the transfer port count when they put in extra passages and ports.

Frits we won't spread the pictures any further unless you give us some more crumbs. A deal?

[pugs]

Looks like I need to raise the RPM when the centrifugal actuator comes in by 1500 RPM . I can't really preload the spring any more as that will reduce the opening mechanism travel.

There are 4 steel balls that fly out to make it all work. They are around 6-7 mm in diameter. I was wondering if using a smaller set of balls may work. I guess another option is to only use 2.

Cheers Wallace.

A bit rough but works... and easy to set up ... Managed to raise the rpm open point from 7000 to 9500 (depending on the spring tension)

To whom it may concern: in my previous posts some pictures got posted that were not yet meant to be published.
I noticed that they also appeared on another forum and in other threads on Kiwibiker. It's entirely my fault but I cannot undo what others posted there. So I would really appreciate it if you would remove those pictures as soon as possible. Thank you.

What the... leave the computer for a while and I missed it...

[Lef16]

https://www.facebook.com/luc.foekema...9441588&type=3
Ryger engine homologation papers online

[pugs]

https://www.facebook.com/luc.foekema...9441588&type=3
Ryger engine homologation papers online

Great

[Frits Overmars]

For those who haven't got Facebook:

[Frits Overmars]

And the second batch:

[Frits Overmars]

And the last picture for now (I could only upload 6 pictures per post):

[Muciek]

Frits any chance of seeing a video (with normal sound ) of the engine running now when it's homologated? Or we have to wait till the karting season starts?