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  [2 stroke]exhaust temperature

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ktuningteam



Nombre de messages : 38
Localisation : valencia
Date d'inscription : 03/03/2015

MessageSujet: [2 stroke]exhaust temperature   Jeu 19 Mar 2015 - 23:48

I am working on improving my 80cc engine, I'm making myself exhausts, I bought a temperature sensor koso my surprise is that only managed to rise to 350 degrees temperature, is this possible? normal is 500 or 600 degrees, this means that a large amount of fresh gases escape through the exhaust and lower the temperature? maybe have little compression in the cylinder head? ...

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Frits Overmars

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Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [2 stroke]exhaust temperature   Ven 20 Mar 2015 - 0:09

ktuningteam a écrit:
I bought a temperature sensor koso my surprise is that only managed to rise to 350 degrees temperature, is this possible? normal is 500 or 600 degrees, this means that a large amount of fresh gases escape through the exhaust and lower the temperature? maybe have little compression in the cylinder head?
With your sensor so close to the cylinder there is a real chance that it is touched by washed-through fresh mixture that subsequently gets pushed back into the cylinder. You can put it another 100 mm further away from the cylinder and see if that makes a difference. You can also experiment with a later ignition timing; that will certainly raise the exhaust gas temperature. A leaner mixture will do that too, but retarding the ignition is safe, leaning the mixture is not.
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ktuningteam



Nombre de messages : 38
Localisation : valencia
Date d'inscription : 03/03/2015

MessageSujet: Re: [2 stroke]exhaust temperature   Ven 20 Mar 2015 - 1:10

thanks for your advice, I have been inspired by his "FOS concept" and Gordon Blair studies, for pipes design. I have put a sensor to 100mm from the piston and another near the end, and the maximum difference is 50 ° between the first and second. So my question is, should I look for the highest temperature? what would be the optimum for a motor gp? would not be a good choice to design a shorter pipe calculated this temperature?
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Frits Overmars

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Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [2 stroke]exhaust temperature   Ven 20 Mar 2015 - 9:30

ktuningteam a écrit:
thanks for your advice, I have been inspired by his "FOS concept" and Gordon Blair studies, for pipes design. I have put a sensor to 100 mm from the piston and another near the end, and the maximum difference is 50 ° between the first and second. So my question is, should I look for the highest temperature? what would be the optimum for a motor gp? would not be a good choice to design a shorter pipe calculated this temperature?
As I wrote, retarding the ignition and leaning the mixture will raise the exhaust gas temperature, but that is not what we want; we want power.The optimum temp for a racing engine will be around 600° but you can only expect to reach that when every aspect of your engine is perfect.
Designing a pipe for the temperature you have actually measured is always a good idea; you will learn from it.
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m4r



Nombre de messages : 1
Localisation : Germany
Date d'inscription : 28/08/2014

MessageSujet: Re: [2 stroke]exhaust temperature   Lun 11 Mai 2015 - 16:16

could it be that your egt probe is rather short and the tip doesn't reach to the center of the pipe?
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ktuningteam



Nombre de messages : 38
Localisation : valencia
Date d'inscription : 03/03/2015

MessageSujet: Re: [2 stroke]exhaust temperature   Lun 11 Mai 2015 - 18:49

It is not very long but reaches far enough to take a temperature, plus those achieved rpm and exhaust length are correct, so I take it for good measure. We are now testing different forms of head and compression, and we hope that this will improve the power and resulting temperature rise.
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ktuningteam



Nombre de messages : 38
Localisation : valencia
Date d'inscription : 03/03/2015

MessageSujet: Re: [2 stroke]exhaust temperature   Lun 11 Mai 2015 - 19:05

Frits, Thiel , help!! you think of this cylinder head design?It is to 80cc, and a compression of approximately 14: 1 (real 7: 1 from closing the exhaust) squiss between 0.6 and 0.7.

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ktuningteam



Nombre de messages : 38
Localisation : valencia
Date d'inscription : 03/03/2015

MessageSujet: Re: [2 stroke]exhaust temperature   Ven 22 Mai 2015 - 21:33

finished head, now try the dyno

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Vortex



Nombre de messages : 41
Localisation : Luxembourg
Date d'inscription : 26/11/2013

MessageSujet: Re: [2 stroke]exhaust temperature   Dim 11 Oct 2015 - 12:35

Hi guys,
Find here some pics from a 125cc engine, head volume is 11cc, using a squish about 1mm, squish angle 4,5 degree parallel to the piston. I have light detonation but without any problem. I can't find the solution in carburation to stop this at 100%.

Any advices will be apreciated.

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Seb4LO

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Nombre de messages : 2605
Localisation : Concarneau
Date d'inscription : 05/07/2009

MessageSujet: Re: [2 stroke]exhaust temperature   Dim 11 Oct 2015 - 15:49

Stinger may be too small , that's nothing close to safe deto !
Your ring will get stuck and no more compression quite fast ....
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Vortex



Nombre de messages : 41
Localisation : Luxembourg
Date d'inscription : 26/11/2013

MessageSujet: Re: [2 stroke]exhaust temperature   Dim 11 Oct 2015 - 16:40

Seb4LO a écrit:
Stinger may be too small , that's nothing close to safe deto !
Your ring will get stuck and no more compression quite fast ....

Thx, unfortunaly the hole exhaust is fixed by homologation, not possible to change the stinger size.
Also the EGT seems not beeing to high with 630°C with that carb configuration, usually 680°C is used.
Should i try a narrower squish near 0,70mm?
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Seb4LO

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Nombre de messages : 2605
Localisation : Concarneau
Date d'inscription : 05/07/2009

MessageSujet: Re: [2 stroke]exhaust temperature   Lun 12 Oct 2015 - 17:25

If you have deto at 1mm , 0.7mm squish will go boom faster

Fuel used
Volume with or without plug hole
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Vortex



Nombre de messages : 41
Localisation : Luxembourg
Date d'inscription : 26/11/2013

MessageSujet: Re: [2 stroke]exhaust temperature   Lun 12 Oct 2015 - 18:25

Seb4LO a écrit:
If you have deto at 1mm , 0.7mm squish will go boom faster

Fuel used
Volume with or without plug hole

Normal fuel 98 octane
Combustion chamber 11cc measured with plug insert 13cc
Not sure, like Jan use to say " where nothing is, nothing can detonate"
Thx
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seattle smitty



Nombre de messages : 29
Localisation : USA northwest
Date d'inscription : 26/10/2014

MessageSujet: Re: [2 stroke]exhaust temperature   Mar 17 Nov 2015 - 17:32

When you say "narrower squish," by "narrower" are you saying, "less clearance between the piston crown and the squishband"?  Assuming that's what you mean, 1mm seems like slightly excessive clearance, although 0.7mm might be getting a little too tight  .  .  . I'd think 0.9mm would be safe, and help with detonation (other things being equal), and if your engine allows 0.8mm without the piston hitting (incl. after the engine has run a few long races and loosened up), that should be better yet.

On the engines I worked on long ago, the crankshaft design and support and other factors discouraged us from going any tighter than 0.9mm, even though those engines didn't rev as high as modern ones.
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Frits Overmars

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Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [2 stroke]exhaust temperature   Mer 18 Nov 2015 - 12:40

Vortex a écrit:
Find here some pics from a 125cc engine, head volume is 11cc, using a squish about 1mm, squish angle 4,5 degree parallel to the piston. I have light detonation but without any problem. I can't find the solution in carburation to stop this at 100%.
Maybe the solution is not in the carburation but in the ignition. As you mentioned homologation, I assume you are talking about a KZ kart engine which means that both the compression ratio and the exhaust restriction are safe.
A 0,7 mm squish gap should be OK as well, and the pictures of your piston show a fairly rich mixture (or a bad premix oil).
You may want to retard the ignition timing by maybe 3° and see if it helps. That way you may loose some low-down power but it will give you an indication of where to look for a solution.
There is also the possibility that the ignition timing advances uncontrollably when the ignition unit gets hot. In that case you should change the unit.
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Vortex



Nombre de messages : 41
Localisation : Luxembourg
Date d'inscription : 26/11/2013

MessageSujet: Re: [2 stroke]exhaust temperature   Dim 29 Nov 2015 - 22:21

Frits Overmars a écrit:
Vortex a écrit:
Find here some pics from a 125cc engine, head volume is 11cc, using a squish about 1mm, squish angle 4,5 degree parallel to the piston. I have light detonation but without any problem. I can't find the solution in carburation to stop this at 100%.
Maybe the solution is not in the carburation but in the ignition. As you mentioned homologation, I assume you are talking about a KZ kart engine which means that both the compression ratio and the exhaust restriction are safe.
A 0,7 mm squish gap should be OK as well, and the pictures of your piston show a fairly rich mixture (or a bad premix oil).
You may want to retard the ignition timing by maybe 3° and see if it helps. That way you may loose some low-down power but it will give you an indication of where to look for a solution.
There is also the possibility that the ignition timing advances uncontrollably when the ignition unit gets hot. In that case you should change the unit.

Thx Frits,
Yes, you are right it is a KZ Kart engine.
I will try to retard, now i use 16,5°-17° btdc
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