AccueilGalerieRechercherS'enregistrerConnexionNouveaux messages depuis dernière visite
Rechercher
 
 

Résultats par :
 
Rechercher Recherche avancée
Qui est en ligne ?
Il y a en tout 12 utilisateurs en ligne :: 2 Enregistrés, 0 Invisible et 10 Invités :: 2 Moteurs de recherche

DidierF, MANETON

Le record du nombre d'utilisateurs en ligne est de 187 le Lun 3 Déc 2012 - 14:45
Derniers sujets
» Mitch# 24 le retour, VMA EVO 7 ème et Dernier round 2019 : finale à Pau
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeAujourd'hui à 2:46 par MD-SF43

» [Technique] Frein sur fourche Earles ou télescopique ? le bon montage ?
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 22:53 par Srx56

» [Pit Laners en course!] Clément Révolte (coupe YAMAHA R125)
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 22:35 par petitvolt

» [Oldies] circuit (de kart) de Villacoublay
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 22:31 par dga

» [WSBK] Argentine 2019
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 22:08 par EDOUARD Jean

» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 21:55 par Zrt1200

» Honda tour de france
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 21:26 par Dukasuz

» [Technique] Comment trouver la dénomination exacte du matériau pour un bras oscillant?
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 19:17 par Dan42

» [MotoGP] KTM
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 13:59 par EDOUARD Jean

» [Klass GP] le vigeant lien live timing
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 12:51 par Buell-LN

» [GP] Johann Zarco
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 11:51 par Didier LEBRUN

» [Endurance] Bol d'Or Circuit Paul Ricard 20-22 septembre 2019
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 11:21 par dblg

» [Road racing] calendrier 2020
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 10:48 par mickey

» [Oldies] Malheureusement, ils sont partis...
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 10:43 par Dialmax

» [Oldies] Programmes et feuilles de temps du siècle dernier.
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 10:35 par sidthouv

» [ WSBK ] 2020
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 10:29 par mickey

» [Oldies] Ils ont p'loté la belle à culbuter de Varese (2ème partie)
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 9:43 par damienfollenfant

» [Oldies] Jarno Saarinen, la star qui a révolutionné le pilotage... (Part 3)
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeHier à 2:19 par DidierF

» [Oldies] Angel Nieto Mike Hailwood ( Part5 )
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 12 Oct 2019 - 22:46 par DidierF

» Final Ulyimate cup LIVE VIDEO
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 12 Oct 2019 - 13:44 par t2

» [Oldies] Honda 450,les cadres de course
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 11 Oct 2019 - 23:07 par Adco

» [Oldies] Quizz??????
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 11 Oct 2019 - 20:37 par DidierF

» [Oldies] La R50 de Robert
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 11 Oct 2019 - 19:05 par Dialmax

» les DUCATI 175cc F3
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 11 Oct 2019 - 13:35 par motori49

» [Oldies] Helmut Fath
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 11 Oct 2019 - 7:10 par fredomono

» [GP] Fabio Quartararo
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 11 Oct 2019 - 7:01 par Pifou

» [Sorties] Classic Machines Nogaro 2019
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeJeu 10 Oct 2019 - 20:49 par TEEWY

» [Road racing] Classic TT/ Manx GP 2019
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeJeu 10 Oct 2019 - 20:45 par raspoutine

» [Oldies] Side-Car: quelques images
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeJeu 10 Oct 2019 - 18:57 par woab

» [MotoGP] GP 2019 de Thaïlande au Shang International Circuit ou Buriram - Les 4 , 5 et 6 Oct 2019
[2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeJeu 10 Oct 2019 - 18:17 par Noël

La réclame...
Mots-clés
ROAD race rouge triumph bourg yamaha motobecane geco 1973 2018 aermacchi france coupe suzuki daytona side 2013 wanted classic charade aprilia eurosport RACING zone metiss ducati
Meilleurs posteurs
Marc
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
philwood
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
EDOUARD Jean
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
mickey
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
Pierre"PhilRead"
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
Fügner
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
Jarno
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
yves kerlo
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
janpol84
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
Dialmax
[2 stroke] Spherical vs Toroïdal head design (UK) Voting16[2 stroke] Spherical vs Toroïdal head design (UK) Voting13[2 stroke] Spherical vs Toroïdal head design (UK) Voting15 
La réclame...

Partagez
 

 [2 stroke] Spherical vs Toroïdal head design (UK)

Aller en bas 
AuteurMessage
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 28 Fév 2015 - 1:23

Hello,

As I'll maybe get a better feedback in English... I'm interested to know advantage/drawback of a toroïdal shape vs spherical, if it could be compared. It seems to me that toroïdal design is more rev oriented, with lower trapped ratio due to higher exhaust charge, but this is just a "feeling" - which tend to be step #1 in making mistakes Wink Overall, it's looks like pressure is clearly oriented to the piston (again in the range of "feelings" [2 stroke] Spherical vs Toroïdal head design (UK) 809262 )

My application is a single 2 stroke 150cc, air cooled, reed case induction, with a reso band that ends @ 9 500-10 000 rpm, so I would write a torque oriented set-up.
Actual head design:

[Vous devez être inscrit et connecté pour voir ce lien]

Djami



Dernière édition par Djamitague le Lun 16 Mar 2015 - 19:41, édité 1 fois
Revenir en haut Aller en bas
Bob van der Zijden



Nombre de messages : 94
Localisation : Hollande
Date d'inscription : 10/09/2013

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Tor. vs hemisp. chamber   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMer 11 Mar 2015 - 23:15

Just 1 remark about your hemisph. chamber : if  I see it right you plan a radius from the squish area to  the actual chamber. This is detrimental for the squish function. This transition should be SHARP. For a Pmax @ 9500  I think the difference between the toroïdal job and the hemi one wouldn't make much difference.
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 13 Mar 2015 - 7:42

Hi Bob!

Thanks for your tip Wink

You're right, there's a radius at junction; I will remove it then, gasses like sharp transition :). As my cylinder head will be a two-pieces assembly I will start first with casual hemi design.


Cheers
Revenir en haut Aller en bas
seattle smitty



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

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeDim 15 Mar 2015 - 17:24

IF, repeat IF I understand correctly, the "toroidal" combustion chamber appears to work best with flat-top pistons, or pistons that are flat-topped but have an angled squish-band, whereas a semi-spherical chamber seems to work a little better with pistons that have the more usual domed crown. The old "half-a-golfball" shape (as in your photo) has been superceded by a wider diameter, more flattened shape for a given volume, with the squish area having got smaller. Have I got this about right, Bob?
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeLun 16 Mar 2015 - 19:32

So, summary:
- Sharped squish edge
- 53% squish area
- 11,5cc volume (without plug hole)
- Squish gap 1,3mm (a rectified ring will take place under the head)
- hemi design  arc design

Note that 3D allows something between both shapes, but let's stick to conventional one. Special stuff is expensive enough to generate additionnal costs wih seizure.

Another question is typical plug to piston top distance?

[Vous devez être inscrit et connecté pour voir ce lien]

(the blue dome comes from Parmakit)
Revenir en haut Aller en bas
JanBros



Nombre de messages : 248
Localisation : Belgique
Date d'inscription : 05/12/2011

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeLun 16 Mar 2015 - 23:27

why such a big squish gap ?
how long is your rod/stroke ?
I thinck 1mm (or even smaller ) would be much better.
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMar 17 Mar 2015 - 13:39

Hi Jan,

The conrod is 105mm long and it's a 54mm stroke. I know that squish gap should be as small as possible but it's just an air cooled head, for standard 98 fuel.
Revenir en haut Aller en bas
GrahamB

GrahamB

Nombre de messages : 3457
Age : 57
Localisation : Lyon
Date d'inscription : 19/08/2011

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMar 17 Mar 2015 - 15:36

My naive guess is that using a partial sphere with the same volume as a toroidal shape implies that the angle at the edge of the squish is less acute. That would potentially be less effective at generating turbulent mixing, in the same direction as using a radius. It's only a guess, however.

1.3mm squish seems about 2x bigger than what I'd shoose to run...
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars

Nombre de messages : 2243
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMar 17 Mar 2015 - 16:12

Djamitague a écrit:
Note that 3D allows something between both shapes, but let's stick to conventional old-fashioned one.
Corrected that for you  Wink .
GrahamB a écrit:
My naive guess is that using a partial sphere with the same volume as a toroidal shape implies that the angle at the edge of the squish is less acute. That would potentially be less effective at generating turbulent mixing, in the same direction as using a radius... 1.3 mm squish seems about 2x bigger than what I'd choose to run...
+1
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMar 17 Mar 2015 - 17:43

GrahamB a écrit:
My naive guess is that using a partial sphere with the same volume as a toroidal shape implies that the angle at the edge of the squish is less acute. That would potentially be less effective at generating turbulent mixing, in the same direction as using a radius. It's only a guess, however.

1.3mm squish seems about 2x bigger than what I'd shoose to run...

I was also thinking this way: sudden break generates more turbulence. Anyway my piston as a radius on top, so curved shape.
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMar 17 Mar 2015 - 18:05

Frits Overmars a écrit:
Djamitague a écrit:
Note that 3D allows something between both shapes, but let's stick to conventional old-fashioned one.
Corrected that for you  Wink . Very Happy Very Happy


GrahamB a écrit:
My naive guess is that using a partial sphere with the same volume as a toroidal shape implies that the angle at the edge of the squish is less acute. That would potentially be less effective at generating turbulent mixing, in the same direction as using a radius... 1.3 mm squish seems about 2x bigger than what I'd choose to run...
+1

Just tell me if I'm wrong: as you wrote, squish clearance can't be too small (regarless minimal mechanical tolerance), but the lower the squish is, higher the head temperature will be?
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars

Nombre de messages : 2243
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMar 17 Mar 2015 - 18:44

Djamitague a écrit:
the lower the squish is, higher the head temperature will be?
No. A tight squish will speed up the combustion, so the piston, head and cylinder will be exposed to the flame for a shorter period of time. There will be more expansion after the end of combustion, the spent gases will cool down more before the exhaust opens, and less heat will be transferred to the exhaust duct.
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMar 17 Mar 2015 - 20:22

Frits Overmars a écrit:
Djamitague a écrit:
the lower the squish is, higher the head temperature will be?
No. A tight squish will speed up the combustion, so the piston, head and cylinder will be exposed to the flame for a shorter period of time. There will be more expansion after the end of combustion, the spent gases will cool down more before the exhaust opens, and less heat will be transferred to the exhaust duct.

Thanks a lot Frits! (The only problem is that.... each answer leads to twice other question........... :))
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeJeu 19 Mar 2015 - 18:25

Bob van der Zijden a écrit:
Just 1 remark about your hemisph. chamber : if  I see it right you plan a radius from the squish area to  the actual chamber. This is detrimental for the squish function. This transition should be SHARP. For a Pmax @ 9500  I think the difference between the toroïdal job and the hemi one wouldn't make much difference.
Hi Bob,

Re. the squish transition, I have here one head (125 NX4 97) with a consistant radius at transition, is it linked with the toroïdal design of the cup? Does it make the squish band larger?

[Vous devez être inscrit et connecté pour voir ce lien]


Dernière édition par Djamitague le Jeu 19 Mar 2015 - 21:20, édité 1 fois
Revenir en haut Aller en bas
Bob van der Zijden



Nombre de messages : 94
Localisation : Hollande
Date d'inscription : 10/09/2013

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeJeu 19 Mar 2015 - 18:57

I see only one combustion chamber on your picture and it shows clearly a radius, which is not good at all. Frits Overmars explained perfectly well what a proper functioning squish band really does: it's a major contribution to a good combustion.
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 21 Mar 2015 - 13:05

Bob van der Zijden a écrit:
I see only one combustion chamber on your picture and it shows clearly a radius, which is not good at all. Frits Overmars explained  perfectly  well what a proper  functioning squish band really does: it's a major contribution to a good combustion.

In addition, is there a typical, or minimal value for the distance shown below?
The spark plug shown is just a sample, I will use one which doesn't protrude (NGK B9EGP)

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



Nombre de messages : 51
Localisation : netherlands
Date d'inscription : 23/12/2012

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 21 Mar 2015 - 13:10

Surface discharge sparkplug doesn't hide your spark from the mixture.
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars

Nombre de messages : 2243
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 21 Mar 2015 - 16:17

Sanderhoutman a écrit:
Surface discharge sparkplugs doesn't hide your spark from the mixture.
That is correct, but those plugs require an exceptionally strong ignition system, Sander.
Revenir en haut Aller en bas
Sanderhoutman



Nombre de messages : 51
Localisation : netherlands
Date d'inscription : 23/12/2012

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 21 Mar 2015 - 19:33

Isn't this depending on the gap for the spark to cross?
I've heared the brisk is performing ok with a ignitech. Or Pvl.
I had trouble with sparkplugs that had the tip concealed.
Creating a head with the ideal squish an volume is less efficiënt when the spark is arround the corner.

I was not aware that the surface discharge plugs put such load on ignitions that the stock ignition might not suffice
Revenir en haut Aller en bas
Bob van der Zijden



Nombre de messages : 94
Localisation : Hollande
Date d'inscription : 10/09/2013

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeSam 21 Mar 2015 - 20:31

If you pick the wrong plug and most probably dont even know what side gapping is you cannot expect good results. Also here the word is : do your homework...
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeMer 25 Mar 2015 - 11:22

Here it is:
[Vous devez être inscrit et connecté pour voir ce lien]
Central vs Original:
[Vous devez être inscrit et connecté pour voir ce lien]
Revenir en haut Aller en bas
Tim Ey



Nombre de messages : 16
Localisation : Allemagne
Date d'inscription : 22/05/2013

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeDim 12 Avr 2015 - 22:04

sorry for the shitty image, but "been there, done that" :-D
[Vous devez être inscrit et connecté pour voir ce lien]
[2 stroke] Spherical vs Toroïdal head design (UK) 980796
Same engine type as yours - but with an old honda cr125 Cylinder. But unfortunatelly I did not had the time to test it...
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 24 Avr 2015 - 13:55

Hallo Kollegen!

Pleased to meet you here! I'm also on the GSF Wink
Mine I start it up but the clutch reached its own limit.............

Is it LC or AC cylinder? Your squish seems to be stepped...?
I ran mine on a 60x54, head volume is 11,6cc (without plug hole) and I'm pretty hurry to Dynoïze it Very Happy
Revenir en haut Aller en bas
Djamitague

Djamitague

Nombre de messages : 34
Localisation : Switzerland
Date d'inscription : 18/07/2014

[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitimeVen 24 Avr 2015 - 14:07

I have on the bench a bigger expansion (belly diam. 133mm), I will run with a higher volume (12,7cc) and smaller squish band (46%). But I need first a consistant clutch.

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




[2 stroke] Spherical vs Toroïdal head design (UK) Empty
MessageSujet: Re: [2 stroke] Spherical vs Toroïdal head design (UK)   [2 stroke] Spherical vs Toroïdal head design (UK) Icon_minitime

Revenir en haut Aller en bas
 
[2 stroke] Spherical vs Toroïdal head design (UK)
Revenir en haut 
Page 1 sur 1
 Sujets similaires
-
» head shaking, c''est quoi ça???????
» Lebrunet - Design for you
» Julie Racing Design
» Design, mon beau design
» KS Design

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