ESE's works engine tuner

[Wos]

Very interesting answers form all

Good Example frits...leaving dentist with blue laughing...🙈🤣



Talked not about mirror finish of these surfaceses.. some Materials take no real mirror finish what ever I did...think of its high silicium content

My goal is more to flaten lathe tool " marks" on surfaces of squish to optimice flow ... lets call it medium mirror ..and in my case best possible reflection of heat from crown by minimize its micro surface😌🙃✋

Heared about just polish last few mm of squish to edge....wob?... maybe a compromise🙈🤔🙃

Wolfgang ✋🤔🙃👍🤪

[wobbly]

Deto starts the bottom of the ring /piston seal surface then migrates up to the sharp piston timing edge , so that in my mind dictates what should be shiny and what should not.

[Frits Overmars]

Deto starts the bottom of the ring /piston seal surface then migrates up to the sharp piston timing edge ,
so that in my mind dictates what should be shiny and what should not.

In my mind it also dictates what should be sharp and what should not .

Partly kidding; I use a radiused piston timing edge mainly for reasons of flow and cooling; the Coanda effect makes the incoming cool charge cling to the piston dome.
But the radiused edge also counteracts deto, killing two birds with one stone, Or, as my esteemed colleague would put it: a free lunch.

[Wos]

In my mind it dictates what should be sharp and what should not .

Partly kidding; I use a radiused piston timing edge mainly for reasons of flow and cooling; the Coanda effect makes the incoming cool charge cling to the piston dome.
But the radiused edge also counteracts deto, killing two birds with one stone, Or, as my esteemed colleague would put it: a free lunch.

Frits!

Wouldn't you teach us more about coanda Effekt? 🤔😉

Seems very effektiv and useful in many ways

Where to use besides of piston edge in a 2 stroke?
How to size radius ...in which place/ circumstanzes/ speeds of flow?

Wouldn't you? 👍🤣✋

Grüße Wolfgang

[Frits Overmars]

Frits!
Wouldn't you teach us more about coanda Effekt? ����
Seems very effektiv and useful in many ways
Where to use besides of piston edge in a 2 stroke?
How to size radius ...in which place/ circumstanzes/ speeds of flow?
Wouldn't you? ����✋

My pleasure Wolfgang.
Coanda effect:

http://www.youtube.com/watch?v=AvLwqRCbGKY

https://www.youtube.com/watch?v=6Q8HssqWDDE




You will find the above info, and a lot of other stuff, in my FOS tips & concepts,
https://1drv.ms/u/s!Atyzb5b7jtWNmVcX...5eKjL?e=nxuw41

[Wos]

My pleasure Wolfgang.
Coanda effect:

http://www.youtube.com/watch?v=AvLwqRCbGKY

https://www.youtube.com/watch?v=6Q8HssqWDDE




You will find the above info, and a lot of other stuff, in my FOS tips & concepts,
https://1drv.ms/u/s!Atyzb5b7jtWNmVcX...5eKjL?e=nxuw41

Remember now your pics frits 👍... but was not aware this is called coanda. Sorry.

Whatever...these days teachers have so much more patience with me✋👍 thank you!!!
Coool to be back at school 🤣

Wolfgang

[Frits Overmars]

Remember now your pics frits .. but was not aware this is called coanda. Sorry.

It's a bit of everything, Wolfgang. Not just Coanda, but also Bernoulli, Reynolds, De Laval, even a bit of me.

these days teachers have so much more patience with me✋ thank you! Coool to be back at school

Teaching can be most rewarding if the students appreciate what you're trying to do. For example, as a volunteer I taught Dutch to asylum seekers who had come to Holland from all over the world. After a few lessons they started to communicate in the only language they all had more or less in common: Dutch.
I had set only one condition: my students had to take the lessons of their own free will and not because participation would give them some privilege
It's the same here: you visit this forum because you want to, and I'll be glad to oblige if I can.

I'll let you in on a little secret. While trying to teach, I also learn myself. I try to explain things as understandably and simply as possible and that forces me to think about the best way to put everything into words. As a result, things sometimes become clearer to me as well. And I'm sure I am not the only one here who has experienced this.

[Wos]

It's a bit of everything, Wolfgang. Not just Coanda, but also Bernoulli, Reynolds, De Laval, even a bit of me.

Teaching can be most rewarding if the students appreciate what you're trying to do. For example, as a volunteer I taught Dutch to asylum seekers who had come to Holland from all over the world. After a few lessons they started to communicate in the only language they all had more or less in common: Dutch.
I had set only one condition: my students had to take the lessons of their own free will and not because participation would give them some privilege
It's the same here: you visit this forum because you want to, and I'll be glad to oblige if I can.

I'll let you in on a little secret. While trying to teach, I also learn myself. I try to explain things as understandably and simply as possible and that forces me to think about the best way to put everything into words. As a result, things sometimes become clearer to me as well. And I'm sure I am not the only one here who has experienced this.

Its more than simple talking here frits!

Triple win for me

Refresh and widen english
Learn and understand more about 2 strokes.
talk discuss communicate to same adicted nice people arround the world

Good job not only for integration of foreigners in netherlands frits👍

At school i was never happy, cause my mother was a teacher and there was a subtle expectation to bring very good certificates 😐🤮

The more happy i am, to be free... free now too learn what i am interested in...without pressure 🥰👍and it feels/ is suddenly easy to learn... wow😎

Be sure frits!!

Have next question in back up✋🤣

Wolfgang

[Storbeck]

Figured this might be a good time to speak up and say thanks to Frits, Jan, Wobbly, Neels, TZ, and all of the other very knowledgeable contributors to this thread. Amazing how much info is on here and shared so freely!

Even more impressive that some of the contributors are speaking in a second language and able to communicate complex subjects so eloquently!

Eventually I'll ask some questions but wanted to start off by showing some appreciation. I've been lurking for quite some time working my way through all of this (there is a lot!) and it really is much appreciated, I'm guessing I'm not the only one that reads but doesn't comment so at least know that we are out there.

[Wos]

Figured this might be a good time to speak up and say thanks to Frits, Jan, Wobbly, Neels, TZ, and all of the other very knowledgeable contributors to this thread. Amazing how much info is on here and shared so freely!

Even more impressive that some of the contributors are speaking in a second language and able to communicate complex subjects so eloquently!

Eventually I'll ask some questions but wanted to start off by showing some appreciation. I've been lurking for quite some time working my way through all of this (there is a lot!) and it really is much appreciated, I'm guessing I'm not the only one that reads but doesn't comment so at least know that we are out there.

Youre welcome Storbeck

Nice true words

Wolfgang ✋

[Pursang]

Thanks to Frits for (re)posting the link to FOS Tips and concepts

While looking through this great resource I came across this pic.



It reminded me that back in the 1990's there was an Aussie Automotive Engineer (John Bennett) that did a lot of research on improving the efficiency of older engines, particularly V8's.

One issue he found was dramatically fluctuating coolant temperatures. He determined this was due to the conventional placement of the thermostat on the inlet side of the radiator.

When coolant temperature was sufficient to open the thermostat the entire engine was then flushed with cold coolant from the radiator. This produced variable (mostly poor) combustion.

His solution was to place the thermostat at the bottom of the system where (when required) relatively small quantities of radiator output was blended with the bypass flow to control the input temp and create a more constant engine operating temperature.



He marketed machined alloy components for the bypass and thermostat housing (Eco-Therm?) They were well regarded but probably far too easily copied.
If some 'Bucketeer' wanted to experiment, he/she would have no trouble producing a workable solution

[pete376403]

Thanks to Frits for (re)posting the link to FOS Tips and concepts

While looking through this great resource I came across this pic.



It reminded me that back in the 1990's there was an Aussie Automotive Engineer (John Bennett) that did a lot of research on improving the efficiency of older engines, particularly V8's.

One issue he found was dramatically fluctuating coolant temperatures. He determined this was due to the conventional placement of the thermostat on the inlet side of the radiator.

When coolant temperature was sufficient to open the thermostat the entire engine was then flushed with cold coolant from the radiator. This produced variable (mostly poor) combustion.

His solution was to place the thermostat at the bottom of the system where (when required) relatively small quantities of radiator output was blended with the bypass flow to control the input temp and create a more constant engine operating temperature.



He marketed machined alloy components for the bypass and thermostat housing (Eco-Therm?) They were well regarded but probably far too easily copied.
If some 'Bucketeer' wanted to experiment, he/she would have no trouble producing a workable solution

Thats a well known fix for a problem the KLR650 (four stroke, sorry) has. The Thermobob bypass, developed and marketed by Wattman. His web page is well documented with the cooling fluctuations that the standard system encounters as the thermostat opens and closes. IN the case of the KLR - the engine runs far too cool, never gets hot unless the bike is not moving. After fitting the thermobob to my KLR, it quickly heats up to mid temp gauge and stays there.

[Pursang]

The Thermobob is a version of the bypass system shown in Frits' drawing.
It is certainly an improvement on basic non-bypass systems.

The Bennett system has the thermostat sited at the bottom not the top.
It is regulating the coolant Input temperature.


AND...Happy Birthday Frits!

[wobbly]

I have tried the thermo housing at the intake side on the bottom of a couple of racebikes.
Maybe the thermo element body was a bit small , but in both cases the hot running temp ( fully closed bypass ) was a few degrees higher
as I think even a small restriction on the pump inlet side has a large effect , Whereas any restriction seen on the pressure return side has little effect on the flow efficiency.

And Happy Birthday Frits , had no idea you are only a day older than the way I feel.

[SwePatrick]

I´ve got a couple of questions for you guys that have converted your rides to EFI.
In what manner do you add fuel 'when on pipe'?

Compensation relative to crankhouse pressure, or pipe pressure?
Either way, do you use any sort of 'pulse damper device' between source and map sensor?
I reckon the map sensor will live a hard life otherwise.

Rgds
Patrick.

A little video of some of the parts i made and will run:
(nevermind the AMG in the beginning, just an intro)