AccueilGalerieRechercherDernières imagesS'enregistrerConnexionNouveaux messages depuis dernière visite
Rechercher
 
 

Résultats par :
 
Rechercher Recherche avancée
Qui est en ligne ?
Il y a en tout 54 utilisateurs en ligne :: 0 Enregistré, 0 Invisible et 54 Invités :: 1 Moteur de recherche

Aucun

Le record du nombre d'utilisateurs en ligne est de 588 le Jeu 26 Sep 2024 - 6:33
Derniers sujets
» [oldies] Honda 125 CB93 1963-1966 /racing kit.
Help! Please two stroke experts !! Icon_minitimeHier à 21:37 par DidierF

»  [MotoGP] Infos , nouveautés , potins , tests et plus pour la saison GP 2025 ...
Help! Please two stroke experts !! Icon_minitimeHier à 18:27 par BOOZE

» Bourg-en-Bresse 1969
Help! Please two stroke experts !! Icon_minitimeHier à 17:40 par tripotemascagne

» Bourg en Bresse 1964
Help! Please two stroke experts !! Icon_minitimeHier à 14:51 par DidierF

» [Oldies] 1961/2011: 50 ans de Yamaha en Grand Prix!
Help! Please two stroke experts !! Icon_minitimeHier à 14:34 par bubu

» [Oldies] Honda 450,les cadres de course
Help! Please two stroke experts !! Icon_minitimeHier à 13:25 par DidierF

» [Technique] Vilebrequin deux temps
Help! Please two stroke experts !! Icon_minitimeHier à 12:39 par JPG

» Té que nique.
Help! Please two stroke experts !! Icon_minitimeMer 20 Nov 2024 - 23:23 par Adco

» Recensement des moteurs V3, deux et quatre temps
Help! Please two stroke experts !! Icon_minitimeMer 20 Nov 2024 - 23:20 par Anthony FZ1

» [Oldies] Répertoire Moto Revue
Help! Please two stroke experts !! Icon_minitimeMer 20 Nov 2024 - 11:59 par DidierF

» [Oldies] Questions (vitesse 1947-1976) (2)
Help! Please two stroke experts !! Icon_minitimeMer 20 Nov 2024 - 11:58 par DidierF

» #4 Restauration de mon side-car des années 70,
Help! Please two stroke experts !! Icon_minitimeMer 20 Nov 2024 - 11:29 par Joel Enndewell 2424

» Honda V3 en préparation
Help! Please two stroke experts !! Icon_minitimeMar 19 Nov 2024 - 21:53 par Toop

» [Oldies] Quizz (30)
Help! Please two stroke experts !! Icon_minitimeMar 19 Nov 2024 - 19:40 par jack177071

» controle technique moto
Help! Please two stroke experts !! Icon_minitimeMar 19 Nov 2024 - 13:17 par Ninja Atak

» Fred, t'es un enfoiré !
Help! Please two stroke experts !! Icon_minitimeLun 18 Nov 2024 - 21:05 par Objectif Lune

»  [MotoGP] GP de Catalogne 2024 à Barcelone les 15 - 16 et 17 Nov 2024
Help! Please two stroke experts !! Icon_minitimeLun 18 Nov 2024 - 18:55 par Ninja Atak

» Sunday Ride Classic 2025 - circuit Paul Ricard
Help! Please two stroke experts !! Icon_minitimeLun 18 Nov 2024 - 18:53 par SuomiFinn 95

» [Oldies] Courses de côte
Help! Please two stroke experts !! Icon_minitimeDim 17 Nov 2024 - 17:21 par Loveside

» [Oldies] Angel Nieto Mike Hailwood (part 7)
Help! Please two stroke experts !! Icon_minitimeDim 17 Nov 2024 - 17:04 par DidierF

» [Oldies] Des livres sur la course moto
Help! Please two stroke experts !! Icon_minitimeDim 17 Nov 2024 - 11:51 par Loveside

» [Oldies] Ils ont p'loté la belle à culbuter de Varese (3ème partie)
Help! Please two stroke experts !! Icon_minitimeSam 16 Nov 2024 - 20:29 par dga

» Micou.
Help! Please two stroke experts !! Icon_minitimeSam 16 Nov 2024 - 17:09 par Joel Enndewell 2424

» Bourg en Bresse 1958
Help! Please two stroke experts !! Icon_minitimeSam 16 Nov 2024 - 16:47 par DidierF

» Questions (vitesse 1977-2001)
Help! Please two stroke experts !! Icon_minitimeSam 16 Nov 2024 - 14:22 par DidierF

» [Oldies] Les transporteurs de motos des paddocks
Help! Please two stroke experts !! Icon_minitimeSam 16 Nov 2024 - 14:08 par DidierF

» [Oldies] Fergus, Geoff, Libero et les autres (vitesse 1946-1960)
Help! Please two stroke experts !! Icon_minitimeSam 16 Nov 2024 - 8:49 par DidierF

» [INTERVIEW] Dans la Boite à Gants - Top moments avec des Top personnages
Help! Please two stroke experts !! Icon_minitimeSam 16 Nov 2024 - 8:42 par cric29

» [Oldies] Dutch TT Assen 1966. Apogée de la période classique.
Help! Please two stroke experts !! Icon_minitimeVen 15 Nov 2024 - 19:30 par DidierF

» Der de der Barcelone....
Help! Please two stroke experts !! Icon_minitimeVen 15 Nov 2024 - 9:34 par Joel Enndewell 2424

Mots-clés
ROAD aprilia coupe artisanales ducati francaises moto bresse classic motos side 1973 fior 2013 zone bourg oldies inventaire suzuki RACING 1976 rouge yamaha charade Mans wanted
Meilleurs posteurs
Marc
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
EDOUARD Jean
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
philwood
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
Pierre"PhilRead"
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
mickey
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
yves kerlo
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
bubu
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
Fügner
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
Dialmax
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
Dan42
Help! Please two stroke experts !! Voting16Help! Please two stroke experts !! Voting13Help! Please two stroke experts !! Voting15 
La réclame...
-30%
Le deal à ne pas rater :
LEGO Icons 10318 – Le Concorde à 139,99€
139.99 € 198.99 €
Voir le deal

 

 Help! Please two stroke experts !!

Aller en bas 
3 participants
AuteurMessage
motoholic71




Nombre de messages : 54
Age : 53
Localisation : Lisbon
Date d'inscription : 19/01/2013

Help! Please two stroke experts !! Empty
MessageSujet: Help! Please two stroke experts !!   Help! Please two stroke experts !! Icon_minitimeJeu 15 Aoû 2019 - 14:13

Bon Jour!

Ok I thought I knew a thing or two about combustion chamber design, squish bands and so on and now I found this on a DT 125 R I'm fixing up for a friend:


[Vous devez être inscrit et connecté pour voir cette image]

Sorry for the pics being so big, I always struggle with it.

Here from another angle:

[Vous devez être inscrit et connecté pour voir cette image]

And the piston crown;

[Vous devez être inscrit et connecté pour voir cette image]

So can someone please explain how this combustion chamber works, I never saw something like this I mean I've seen older two strokes without a squish band but these were not performance engines, it was engines with very little assistance from a sort of the exhaust chamber.

Now this is an engine with 6.5:1 compression and 28 hp, ypvs and so on. So not exactly a slug

How can this be without a squish band and what is that ridge on the edge of the c. chamber ?

How does this work ,please anyone that knows will please explain?

Thank you very much.

Fernando
Revenir en haut Aller en bas
190mech




Nombre de messages : 4
Localisation : USA
Date d'inscription : 24/03/2012

Help! Please two stroke experts !! Empty
MessageSujet: Re: Help! Please two stroke experts !!   Help! Please two stroke experts !! Icon_minitimeJeu 15 Aoû 2019 - 23:57

That is a common head design in the Yamaha Jog scooters also,they are rubbish and are replaced with a modern squish head if more power is sought..If a squish head for your type is not available,welding and re cutting may be an option...
Revenir en haut Aller en bas
motoholic71




Nombre de messages : 54
Age : 53
Localisation : Lisbon
Date d'inscription : 19/01/2013

Help! Please two stroke experts !! Empty
MessageSujet: Re: Help! Please two stroke experts !!   Help! Please two stroke experts !! Icon_minitimeDim 1 Sep 2019 - 8:10

Sorry I had to leave to a place with no grid.
Thank you for your input 190mech.
Revenir en haut Aller en bas
Toop




Nombre de messages : 3925
Age : 17
Localisation : Tours
Date d'inscription : 02/01/2010

Help! Please two stroke experts !! Empty
MessageSujet: Re: Help! Please two stroke experts !!   Help! Please two stroke experts !! Icon_minitimeDim 1 Sep 2019 - 8:40

It's a bitch supposed to reduce noise (it is explained so in the writings) , it's nonsense for performance.
It works like all those shits that are trying to get out of power without cycling speed -> increased turbulence ... but lower overall flow

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





Help! Please two stroke experts !! Empty
MessageSujet: Re: Help! Please two stroke experts !!   Help! Please two stroke experts !! Icon_minitime

Revenir en haut Aller en bas
 
Help! Please two stroke experts !!
Revenir en haut 
Page 1 sur 1
 Sujets similaires
-
» [2 Stroke] How plug up a 2-stroke wristpin?
» [SORTIES] Sunday Ride Classic au Castellet, 5 & 6 avril 2014
» [2 stroke] Prototype 150 cc
» Two stroke infos
» [2 stroke] ISF question

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