AccueilGalerieRechercherDernières imagesS'enregistrerConnexionNouveaux messages depuis dernière visite
Rechercher
 
 

Résultats par :
 
Rechercher Recherche avancée
Qui est en ligne ?
Il y a en tout 105 utilisateurs en ligne :: 10 Enregistrés, 1 Invisible et 94 Invités :: 3 Moteurs de recherche

berlu, dga, DidierF, jb42, joel noirel, lavocadudiabl, marcel59, marco91, spyderman 32, Tobec02

Le record du nombre d'utilisateurs en ligne est de 588 le Jeu 26 Sep 2024 - 4:33
Derniers sujets
»  [MotoGP] Infos , nouveautés , potins , tests et plus pour la saison GP 2025 ...
 [2 stroke]exhaust temperature Icon_minitimeAujourd'hui à 11:51 par Mykeul

» [Technique] Vilebrequin deux temps
 [2 stroke]exhaust temperature Icon_minitimeAujourd'hui à 11:39 par JPG

» [Oldies] Honda 450,les cadres de course
 [2 stroke]exhaust temperature Icon_minitimeAujourd'hui à 9:03 par Ala Zorro

» Bourg en Bresse 1964
 [2 stroke]exhaust temperature Icon_minitimeAujourd'hui à 7:58 par Adco

» [Oldies] 1961/2011: 50 ans de Yamaha en Grand Prix!
 [2 stroke]exhaust temperature Icon_minitimeHier à 22:27 par DidierF

» Té que nique.
 [2 stroke]exhaust temperature Icon_minitimeHier à 22:23 par Adco

» Recensement des moteurs V3, deux et quatre temps
 [2 stroke]exhaust temperature Icon_minitimeHier à 22:20 par Anthony FZ1

» [Oldies] Répertoire Moto Revue
 [2 stroke]exhaust temperature Icon_minitimeHier à 10:59 par DidierF

» [Oldies] Questions (vitesse 1947-1976) (2)
 [2 stroke]exhaust temperature Icon_minitimeHier à 10:58 par DidierF

» #4 Restauration de mon side-car des années 70,
 [2 stroke]exhaust temperature Icon_minitimeHier à 10:29 par Joel Enndewell 2424

» Honda V3 en préparation
 [2 stroke]exhaust temperature Icon_minitimeMar 19 Nov 2024 - 20:53 par Toop

» [Oldies] Quizz (30)
 [2 stroke]exhaust temperature Icon_minitimeMar 19 Nov 2024 - 18:40 par jack177071

» controle technique moto
 [2 stroke]exhaust temperature Icon_minitimeMar 19 Nov 2024 - 12:17 par Ninja Atak

» Fred, t'es un enfoiré !
 [2 stroke]exhaust temperature Icon_minitimeLun 18 Nov 2024 - 20:05 par Objectif Lune

»  [MotoGP] GP de Catalogne 2024 à Barcelone les 15 - 16 et 17 Nov 2024
 [2 stroke]exhaust temperature Icon_minitimeLun 18 Nov 2024 - 17:55 par Ninja Atak

» Sunday Ride Classic 2025 - circuit Paul Ricard
 [2 stroke]exhaust temperature Icon_minitimeLun 18 Nov 2024 - 17:53 par SuomiFinn 95

» [Oldies] Courses de côte
 [2 stroke]exhaust temperature Icon_minitimeDim 17 Nov 2024 - 16:21 par Loveside

» [Oldies] Angel Nieto Mike Hailwood (part 7)
 [2 stroke]exhaust temperature Icon_minitimeDim 17 Nov 2024 - 16:04 par DidierF

» [Oldies] Des livres sur la course moto
 [2 stroke]exhaust temperature Icon_minitimeDim 17 Nov 2024 - 10:51 par Loveside

» [Oldies] Ils ont p'loté la belle à culbuter de Varese (3ème partie)
 [2 stroke]exhaust temperature Icon_minitimeSam 16 Nov 2024 - 19:29 par dga

» Micou.
 [2 stroke]exhaust temperature Icon_minitimeSam 16 Nov 2024 - 16:09 par Joel Enndewell 2424

» Bourg en Bresse 1958
 [2 stroke]exhaust temperature Icon_minitimeSam 16 Nov 2024 - 15:47 par DidierF

» Questions (vitesse 1977-2001)
 [2 stroke]exhaust temperature Icon_minitimeSam 16 Nov 2024 - 13:22 par DidierF

» [Oldies] Les transporteurs de motos des paddocks
 [2 stroke]exhaust temperature Icon_minitimeSam 16 Nov 2024 - 13:08 par DidierF

» [Oldies] Fergus, Geoff, Libero et les autres (vitesse 1946-1960)
 [2 stroke]exhaust temperature Icon_minitimeSam 16 Nov 2024 - 7:49 par DidierF

» [INTERVIEW] Dans la Boite à Gants - Top moments avec des Top personnages
 [2 stroke]exhaust temperature Icon_minitimeSam 16 Nov 2024 - 7:42 par cric29

» [Oldies] Dutch TT Assen 1966. Apogée de la période classique.
 [2 stroke]exhaust temperature Icon_minitimeVen 15 Nov 2024 - 18:30 par DidierF

» Der de der Barcelone....
 [2 stroke]exhaust temperature Icon_minitimeVen 15 Nov 2024 - 8:34 par Joel Enndewell 2424

» Jacky Germain
 [2 stroke]exhaust temperature Icon_minitimeJeu 14 Nov 2024 - 22:25 par Joel Enndewell 2424

» [Technique] Le frein des Aermacchi 250 et 350 1973
 [2 stroke]exhaust temperature Icon_minitimeJeu 14 Nov 2024 - 18:15 par Bricole 63

Mots-clés
inventaire motos side ducati suzuki charade coupe bourg Mans rouge classic bresse RACING artisanales oldies 1973 1976 moto wanted aprilia francaises 2013 fior ROAD zone yamaha
Meilleurs posteurs
Marc
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
EDOUARD Jean
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
philwood
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
Pierre"PhilRead"
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
mickey
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
yves kerlo
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
bubu
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
Fügner
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
Dialmax
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
Dan42
 [2 stroke]exhaust temperature Voting16 [2 stroke]exhaust temperature Voting13 [2 stroke]exhaust temperature Voting15 
La réclame...
Le Deal du moment : -19%
PC portable MSI Gaming Pulse 16” -Ultra7 155H ...
Voir le deal
1299 €

 

  [2 stroke]exhaust temperature

Aller en bas 
+2
Frits Overmars
ktuningteam
6 participants
AuteurMessage
ktuningteam




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

 [2 stroke]exhaust temperature Empty
MessageSujet: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeJeu 19 Mar 2015 - 22:48

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? ...

[Vous devez être inscrit et connecté pour voir cette image]
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2638
Age : 76
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeJeu 19 Mar 2015 - 23:09

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.
Revenir en haut Aller en bas
ktuningteam




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeVen 20 Mar 2015 - 0:10

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?
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2638
Age : 76
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeVen 20 Mar 2015 - 8:30

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.
Revenir en haut Aller en bas
m4r




Nombre de messages : 1
Localisation : Germany
Date d'inscription : 27/08/2014

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeLun 11 Mai 2015 - 14:16

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




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeLun 11 Mai 2015 - 16:49

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.
Revenir en haut Aller en bas
ktuningteam




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeLun 11 Mai 2015 - 17:05

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.

[Vous devez être inscrit et connecté pour voir cette image]
Revenir en haut Aller en bas
ktuningteam




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeVen 22 Mai 2015 - 19:33

finished head, now try the dyno

[Vous devez être inscrit et connecté pour voir cette image]
Revenir en haut Aller en bas
Vortex




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeDim 11 Oct 2015 - 10:35

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.

[Vous devez être inscrit et connecté pour voir ce lien]
Revenir en haut Aller en bas
Seb4LO

Seb4LO


Nombre de messages : 2607
Localisation : Concarneau
Date d'inscription : 05/07/2009

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeDim 11 Oct 2015 - 13:49

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




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeDim 11 Oct 2015 - 14:40

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?
Revenir en haut Aller en bas
Seb4LO

Seb4LO


Nombre de messages : 2607
Localisation : Concarneau
Date d'inscription : 05/07/2009

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeLun 12 Oct 2015 - 15:25

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

Fuel used
Volume with or without plug hole
Revenir en haut Aller en bas
Vortex




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeLun 12 Oct 2015 - 16:25

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
Revenir en haut Aller en bas
seattle smitty




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeMar 17 Nov 2015 - 16:32

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.
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2638
Age : 76
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeMer 18 Nov 2015 - 11:40

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.
Revenir en haut Aller en bas
Vortex




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

 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitimeDim 29 Nov 2015 - 21:21

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
Revenir en haut Aller en bas
Contenu sponsorisé





 [2 stroke]exhaust temperature Empty
MessageSujet: Re: [2 stroke]exhaust temperature    [2 stroke]exhaust temperature Icon_minitime

Revenir en haut Aller en bas
 
[2 stroke]exhaust temperature
Revenir en haut 
Page 1 sur 1
 Sujets similaires
-
» [2 stroke] Exhaust chamber software
» Exhaust Pipe of Four-Stroke Engines
» [2 Stroke] Cagiva Mito Racer-new Exhaust
» [2 Stroke] How plug up a 2-stroke wristpin?
» [Technique] Température KR 108

Permission de ce forum:Vous ne pouvez pas répondre aux sujets dans ce forum
 :: ACTUALITES :: [GP] :: [GP125 (et 250 Snif!)]-
Sauter vers: