ESE's works engine tuner

[Haufen]

Just noticed that the emissions tests on the KZ2 engine and the so called Clean 2T were done at 5000 rpm - what a joke.
Makes me wonder about the whole thing when you see that sort of skewed ,make it look good at any cost bullshit.

Also, the KZ2 engine was run richer (CO values) and, depending on the load and ignition timing etc., would be more likely to miss a couple of ignitions at 5000 rpm than the (c)leaner engine which would then explain the different HC values easily.

[peewee]

hey guys i cut this head open to see what it looks like and drilled some holes to see how much material there is. it appears to be plenty thick. i want to make a chamber shape like what jan did . somehow i just have to calculate it so i get the correct volume

[Muciek]

hey guys i cut this head open to see what it looks like and drilled some holes to see how much material there is. it appears to be plenty thick. i want to make a chamber shape like what jan did . somehow i just have to calculate it so i get the correct volume

Finished Webco reproduction heads for RD350/400 with Wobbly designed combustion chambers

Attachment 309101Attachment 309102Attachment 309103Attachment 309104

Wouldn't it be better to do it like this ones for RD ?

[Frits Overmars]

Took the Ryger-kart for a little spin today.
God Almighty!


I've got a fairly good idea of what to expect from a 125 cc kart. But this....
The revcounter could hardly keep up with the crankshaft but in any case it revved much higher than a normal 125 and I reached the end of the straight-away much quicker. What a rocketship!

[wobbly]

Perfectly chosen pics there Frits.

Re the head inserts - here is a TZ350 with these fitted after machining away the original material completely.
This setup also had a plate welded onto the top of the cylinder to redirect the water flow correctly.

[Flettner]

Frits, you are taunting us.

[adegnes]

I haven't been this excited in a long time!

[Grumph]

Perfectly chosen pics there Frits.

Agreed - I think we'll all recognise the van now.....

[ken seeber]

Ryger engine.
If you go to http://www.deraceheldenvanweleer.nl/index.php?wap2 then to full version and then to Engine Talk, from Page 76 or so onwards, there is more on it. Banter and speculation, but CDA limited.
Still, it'll be good to see what it is in the end.
A rotary/reed engine winding up from 8k to 22k gives me goosepimples, dunno what the same would do going to 30k. Dampness?

[husaberg]

Ryger engine.
If you go to http://www.deraceheldenvanweleer.nl/index.php?wap2 then to full version and then to Engine Talk, from Page 76 or so onwards, there is more on it. Banter and speculation, but CDA limited.
Still, it'll be good to see what it is in the end.
A rotary/reed engine winding up from 8k to 22k gives me goosepimples, dunno what the same would do going to 30k. Dampness?

Ken we have been trying to keep that one a secret........
I haven't looked at that forum for about 6 months either
Even worse it looks like I am bloody right about the crank.
If its got an upside down piston that extends into the head and a bottom ex port I have just wasted 2 weeks.

[Frits Overmars]

Perfectly chosen pics there Frits.

They are not selfies Wob; I didn't take them. I had no free hand in choosing them either. But in case you want to see more details of the van, I can ask .

Frits, you are taunting us.

I can't help it. I'd love to tell y'all much more but I'm not yet at liberty to do so.

I haven't been this excited in a long time!

Same here!

[peewee]

Perfectly chosen pics there Frits.

Re the head inserts - here is a TZ350 with these fitted after machining away the original material completely.
This setup also had a plate welded onto the top of the cylinder to redirect the water flow correctly.

ive seen guys machine out the whole chamber on the stock heads and use a removable cool head style chamber insert, like your photo. problem is most shops around here only know how to cut standard hemi style chambers so ill likely be stuck doing the calculations myself. any tips on what my comp ratio should be ? atleast that would give me a idea where to start with the head chamber. its 64x58 dimensions. ive got it loaded in engmod but i was using it mostly just for guidance on the STA values

on to another project. its got honda rod, piston and exh manifold. this one ill put in engmod in the next few days but im not sure what to do on the A, B,C axial angles. should A=30*. B=20*. C=10* ? and which way do i stagger the timing ? thought i read it should be A first, then B next and C/D last. i think ive got the cylinder spaced up correctly. piston just pops above the deck a few mm but not enough so the top ring will pop out of the bore. that leaves me with 182/122 timings which is a good place to start so i can have plenty of material to get a good axial angle on the A port (ktm put all the side tranfers at 5*).

[chrisc]

Some good viewing in here from TechGP on facebook
https://www.facebook.com/media/set/?...8046078&type=3

[wobbly]

The only reason to use normal stagger, ie A open first is if you have no powervalve, and need the inherent power spread of that type of porting layout.
As seen in KZ2 for example.

[Flettner]

Words for today nonsmoking 125cc 2t 70HP @ 17-18k rpm

Here's picture Attachment 312083

Frits could shed some light on it , but like he said other place he have a confidentiality clause.

That top reed block is quite high up the cylinder, looks like it goes straight into the back of the cylinder at transfer height, ie straight into the transfers.