ESE's works engine tuner

[Frits Overmars]

Frits, with the exhaust ports sitting directly above all transfer ports and with what looks like a very small area of metal seperating them....

True. The metal between auxiliary exhaust floors and transfer roofs in many conventional cylinders is even thinner, but the difference is that in my cylinder all transfer roofs double as exhaust floors. The commas will form a welcome heat barrier.

I would think the water cooling path to keep all this cool would have to be really targeted.

True again. Like I said the other day, I wanted to show more of the cylinder layout here, but there was no option to upload the ZIP-file, so I mailed it to Mental Trousers. He wrote: "I'm still away on holiday at the moment so I'm only online sporadically using my phone and I'm not able to do this right now but I'll take care of it as soon as I get back to civilisation."

[TZ350]

Maybe it helps if you not only watch how far the throttle is opened, but also the rate at which it is opened.

Ok, I have found the section in the Ecotrons manual where it talks about tuning for the throttle blip.


By default it does not work above 3,000rpm, but I can set it higher to suit my engine.



From a quick read, the amount of enriching is tied to the predicted load increase as the throttle is opened. I guess its like a smart accelerator pump.



You can determine the "Load" from the recorded data.



And adjust the map, it looks like a bit of trial and error is required to get it right.



There are other adjustments in the advanced calibration file for tuning for the rate of change in the throttle opening (TPS).

All I need to do now is learn how to use it.

[136kg136ps]

Wobbly,would there be any advantage to a divider in a RZ or CPI cylinder intake?

[Lucas M]

Your project is very interesting, I would love to see more pictures and details of your work posted here as it progresses.

No Problem. It´s a pleasure for me, to giving you something back, for all the stuff you (and the others) posted here.

The pictures below show some details of work. I also installed a 120mm PC fan above the head. It works with 14,8V lithium polymer accu. Very good cooling for the cylinder head. Maybe you should think of
On the one picture you can see my 2 stroke car called Trabant built in my hometown Zwickau/Germany. 26HP out of 600ccm

[wobbly]

The RZ/CPI has a severe down bend in the intake, thus the majority of the flow adheres to the roof and of course punches open the upper
reeds way more than the lowers ( made worse by the fact that the Boyesens are on the reed box floor ).
With a VF3 in place you can make a curved blade the same thickness as the VF divider at one end ( with a ball nose radius to fit over the leading edge )
tapering down to a small radius facing the carb.
By raising the leading edge of the blade you can equalise the upper and lower reed opening ( that is the flow ).
Easy to test with a vacuum cleaner hose connected to the exit ( or a leaf blower, or if you are really desperate the exhaust pipe on your car - been there done that ).
Of course the flow bench with a velocity pitot is the real go.
I did this on a CR250 on a kart and picked up 3Hp from memory.

[136kg136ps]

Brilliant,thanks!

[jasonu]

No Problem. It´s a pleasure for me, to giving you something back, for all the stuff you (and the others) posted here.

The pictures below show some details of work. I also installed a 120mm PC fan above the head. It works with 14,8V lithium polymer accu. Very good cooling for the cylinder head. Maybe you should think of
On the one picture you can see my 2 stroke car called Trabant built in my hometown Zwickau/Germany. 26HP out of 600ccm

Have you got any videos of your class you can post here?

[Frits Overmars]

Have you got any videos of your class you can post here?

Here you go: http://www.youtube.com/watch?v=nqSoqF1vnRQ . And at the right of the YouTube page you'll find a lot more Simson videos.
The big guy doing the interviews is my mate Jan Schäffer wo runs a two-stroke tuning business in Zwickau. Weighing 116 kg with his boots on he's not quite the perfect figure for 50 cc racing. But nobody told him, so he is also the guy who won more SimsonGP titles than any other rider.
After dominating the open classes I persuaded him to try his luck in the aircooled pistonported standard 50cc class, thinking that he couldn't possibly win there, which would be good for the series. Well, he won the 50 cc standard class and using the same 50 cc bike he also won the 85 cc standard class. that 50 cc bike ain't bad.

[2T Institute]

Love the Trabie

[Frits Overmars]

Love the Trabie

You asked for it:

[jasonu]

Here you go: http://www.youtube.com/watch?v=nqSoqF1vnRQ . And at the right of the YouTube page you'll find a lot more Simson videos.
The big guy doing the interviews is my mate Jan Schäffer wo runs a two-stroke tuning business in Zwickau. Weighing 116 kg with his boots on he's not quite the perfect figure for 50 cc racing. But nobody told him, so he is also the guy who won more SimsonGP titles than any other rider.
After dominating the open classes I persuaded him to try his luck in the aircooled pistonported standard 50cc class, thinking that he couldn't possibly win there, which would be good for the series. Well, he won the 50 cc standard class and using the same 50 cc bike he also won the 85 cc standard class.

Thanks for posting.

[TZ350]

The pictures below show some details of work. On the one picture you can see my 2 stroke car called Trabant built in my hometown Zwickau/Germany. 26HP out of 600ccm

Thanks for the tip about the PC fan, I will try it. I like the pictures, very good workmanship, and I think your Trabaint transporter is really cool...

[F5 Dave]

Good to see you out on the GP again, pity it just didn't want to pick up. Must be more on this initial throttle opening stuff.

[AndreasL]

Mental Trousers wrote: "I'm still away on holiday at the moment so I'm only online sporadically using my phone and I'm not able to do this right now but I'll take care of it as soon as I get back to civilisation."

Cant wait!

No Problem. It´s a pleasure for me, to giving you something back, for all the stuff you (and the others) posted here.

The pictures below show some details of work. I also installed a 120mm PC fan above the head. It works with 14,8V lithium polymer accu. Very good cooling for the cylinder head. Maybe you should think of
On the one picture you can see my 2 stroke car called Trabant built in my hometown Zwickau/Germany. 26HP out of 600ccm

Great Lucas!
Please let us see more of your work.
I find it really interesting since I know "everything" about 50cc barrels with to tightly placed studs and crap dual transfers with little room for improvement.
The Simson is way better then anything I have so even half of your PS would be great.
EngMod2T says it is easily but I'm not overly convinced that a BMEP of even 6-8 bar is realistic for me and my lack of experience. Time will tell. Lawnmover anyone? 

[FastFred]

For sale Next generation bucket race bikes.

CVT Scooter Vis CBR on a Kart track. TZ's idea of using a CVT looks like a good one, it can only be time before someone makes a Bucket using a CVT transmission.