ESE's works engine tuner

[pete376403]

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Posted for those like my self who are following 2Stroke Stuffing's adventures with his supercharged engine. https://youtu.be/47sf_5IQeMI

Attachment 349144

I have been pretty quiet my self lately re-building a 250cc pre 72 Post Classic racer with its rotary valve Kawasaki engine. Flettner has given me a lot of help with this. Also someone else, the DoldGuy donated the carburetor and also helped me a lot with getting the DynoJet dyno working again.

There is nothing to special about this engine. It follows the current conventional single exhaust, 5 transfer two stroke tuning ideas. And the timing and pipe design was developed using EngMod2T software. It will run on a petrol/acetone/methanol mix. Methanol for cooling. Acetone to stabalise the Methanol against pre ignition. Petrol to adjust the engine's running temperature.

I am working on finalising the pipe design now and expect, because the engine will be Methanol cooled the pipe will be noticable shorter than a straight petrol pipe because the average pipe temperature will be much lower. I am not entirly sure about this so if anyone has experiance with this any tips would be welcome.

Have you checked out Harry Klemms F5 / F8/ F9 preparation tips? Lots wrong with those engines as they left the factory, but lots of potential when put together properly.

[Muhr]

Hi everyone, does anyone know a 115-120 conrod that has a 22mm pin. Have had a hard time finding anyone, last night's solution became a sleeve. Does not feel optimal, maybe someone who has made some other good solution to this problem.
a bonus in this case was that this conrod we put in had some weight which compensated for the change of pin quite well.

Muhr

[OopsClunkThud]

Hi everyone, does anyone know a 115-120 conrod that has a 22mm pin. Have had a hard time finding anyone, last night's solution became a sleeve. Does not feel optimal, maybe someone who has made some other good solution to this problem.
a bonus in this case was that this conrod we put in had some weight which compensated for the change of pin quite well.

Muhr

I think RD400 is 115 with 22mm pin

https://www.ebay.com/itm/25469887775...cf824ad7d84a08

[katinas]

Hi everyone, does anyone know a 115-120 conrod that has a 22mm pin. Have had a hard time finding anyone, last night's solution became a sleeve. Does not feel optimal, maybe someone who has made some other good solution to this problem.
a bonus in this case was that this conrod we put in had some weight which compensated for the change of pin quite well.

Muhr

Hi Muhr , KTM SX 200 conrod length 118 mm 22 mm pin ( 28 mm big end eye and 20 mm small end eye). Width 16 mm.
Big end outside 40 mm.

[wobbly]

TeeZee , I have done several projects using Methanol.
If tuned by way of pretty much stock ignition timing and going to 18 to 20 : 1 compression , the optimal egt seems to be around 420*C.
This is well over rich , but is perfect for an air cooled in this respect.
Thus the pipe average wall temps input for EngMod become 425 x 420/650 = 275* @ peak power and around 75% of that at the bottom of the powerband.

[Frits Overmars]

... a bonus in this case was that this conrod we put in had some weight which compensated for the change of pin quite well.

So you had to use a lighter pin and therefore you are glad that the con rod is heavier?
A lighter pin or small end bearing or con rod small end or piston or ring will increase the balance factor and reduce the reciprocating balance force, while the rotating balance force remains unaltered. In short, lighter is always better. It's the balance forces, not the balance factor, that cause vibrations.

In theory, if you keep reducing those reciprocating masses, you may reach a point where the balance factor exceeds 100%, and then the vibration will increase once more, but now with a 180° phase shift. But in real life I've never seen that happen.

[wobbly]

Haha Frits , you are making an assumption we all live in real life.

[husaberg]

I can't be arsed formatting it
But I have a few spreadsheets to put into one document one day it is not pretty.

There is double-ups and you will need to double check and there is likely a few 4ts
CLICK ON IT 3 TIMES

[sniemisto]

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It will run on a petrol/acetone/methanol mix. Methanol for cooling. Acetone to stabalise the Methanol against pre ignition. Petrol to adjust the engine's running temperature.

What mixing ratios you planned to use? I’m interested in trying something similar on my air cooled Tomos.

[speedpro]

I used the same ingredients in my bike's fuel. 25% petrol(98), 75% methanol. With 20L of that mixed I then tipped in Acetone until it blended. Typically it took about 1L of acetone. It instantly turned from a cloudy mixture to perfectly clear as I tipped in the acetone. I used 100 octane and toluol for a while but 98 is something like 30% toluol so no need to add more. Given time the fuel will dissolve most flexible fuel hoses.

[Muhr]

Thank you all for the help (Husa impressive!) I look around among your suggestions and see what I can find.

Frits
Yes that's how it is. In this case, we change the deck height, cylinder, piston, conrod length and head. And do not end up super bad when it comes to balance factor or change the receiver weight significantly without touching the crankshaft.
little win win effort vs outcome. (22mm pin is big end)

[peewee]

Hi everyone, does anyone know a 115-120 conrod that has a 22mm pin. Have had a hard time finding anyone, last night's solution became a sleeve. Does not feel optimal, maybe someone who has made some other good solution to this problem.
a bonus in this case was that this conrod we put in had some weight which compensated for the change of pin quite well.

Muhr

yes ktm200 may suit you but check the prox catalogue for more options. maybe you can bore the pin bore in the web as well. i did that to fit a cr500 conrod to a ktm and its still holding up well

[Frits Overmars]

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[TZ350]

Haha Frits , you are making an assumption we all live in real life.

Yep, I have found reality to be over rated ........

[TZ350]

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Although I have used Methanol and Acetone before. I liked the results but need to make a better job of it for the post classic racer.

Big shout out and thanks to:- Grumph, Teriks, SwePatrick, pete376403, Flettner and Wobbly for their thoughts and experiance with using Methanol. It has been a great help.