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pojoran

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» Fred, t'es un enfoiré !
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» [Oldies] Critérium ACO Le Mans 1968, 1969, 1970
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» Circuit de vitesse Bourg 1959
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» Salon Moto Légende 2021/...2022 !
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» Salzburgring 1971
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» [Oldies] Les motos JBB, toute une histoire...
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» [Bla bla bla] ePower : Y va-t-on vraiment ?
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» Honda 450 en course.
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» [Oldies] Collections motos en vente aux enchères...
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» [Oldies] Moto Journal 200-1976
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeDim 27 Nov 2022 - 16:58 par DidierF

» [Oldies] Moto Journal 200 1976. C. Léon et Y. Duhamel Kawa 750
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» 87 x 67
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeSam 26 Nov 2022 - 19:02 par justin

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Marc
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Voting16[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Voting13[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Voting15 
EDOUARD Jean
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philwood
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mickey
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Pierre"PhilRead"
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yves kerlo
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Voting16[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Voting13[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Voting15 
Fügner
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bubu
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Jarno
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Dialmax
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 [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)

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AuteurMessage
dga

dga


Nombre de messages : 1800
Localisation : 78
Date d'inscription : 12/01/2018

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Empty
MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeDim 23 Oct 2022 - 19:08

Thanks Frits !
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Architito2002




Nombre de messages : 4
Age : 48
Localisation : Torino, Italia
Date d'inscription : 28/12/2021

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Empty
MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeLun 24 Oct 2022 - 10:03

Good morning Frits, good morning everyone, trying to understand the two-stroke exhaust I assimilated this to a helmholtz resonator, but then analyzing the pulsations that occur inside I seemed to understand that in the end the resonance does not occur but is exploited "only" "the reverberation of the exhaust impulse. Is this a correct interpretation in your opinion? Thanks
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vorlis




Nombre de messages : 6
Age : 38
Localisation : cier de luchon
Date d'inscription : 24/06/2015

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Empty
MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeLun 24 Oct 2022 - 11:22

Quand vous dites 140% de remplissage c'est en rapport a la cylindré, 124.8cc, ou en rapport a la cylindré plus la chambre de combustion, 124.8cc+8.6cc=133.4cc ?

Comment faites-vous pour calculer ce taux de remplissage, c'est une opération que vous pouvez nous décrire ici ou cela est trop complexe?

Dans votre formule mathématique pour le calcul de la chambre de résonance(pot d'échappement) pourquoi visez-vous le régime de puissance maximal, je pensai qu'il serai logique de viser le régime de couple maximal?
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vorlis




Nombre de messages : 6
Age : 38
Localisation : cier de luchon
Date d'inscription : 24/06/2015

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MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeLun 24 Oct 2022 - 11:29

Est-ce que quelqu'un a le lien de la discussion sur kiwibiker qui traite du conduit d'échappement sur les moteurs deux temps? je l’avais vu(dans ce sujet) sans l'enregistrer en pensant pouvoir le retrouver facilement, maintenant je ne le trouve plus!!

Merci d'avance.
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vorlis




Nombre de messages : 6
Age : 38
Localisation : cier de luchon
Date d'inscription : 24/06/2015

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MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeLun 24 Oct 2022 - 11:37

Bonjour jan, cette question est pour vous si vous venez occasionnellement ici, plus tôt dans la discussion vous avez dit que si vous faisiez un nouveau moteur il aurait une valve d'échappement en acier inoxydable d'une épaisseur de 1.5mm, est-ce que j'ai bien compris? Pourquoi en acier inoxydable et pourquoi si fine, 1.5mm me parait fragile, cela serait peut être pour une valve diabolo évidé?

Bonne journée a tous! NONO
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walms




Nombre de messages : 1
Localisation : Canada
Date d'inscription : 18/03/2019

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Empty
MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeDim 20 Nov 2022 - 3:54

My apologies if this topic has already been discussed elsewhere, I didn't have any luck finding it. I'm interested in pipe centre section diameters. I was under the assumption that bigger the better as long as you can make it fit.
Using engmod2T, I ran a series of simulations comparing pipes derived using the program's Blair pipe generator. I kept all parameters the same except exhaust port to centre section coefficient. 6 pipes ranging from 2.5 to 3.75x. For the most part, the simulation results show the larger the pipe, the better. Although Max peak hp was from the 3.25 pipe, over rev seemed to be better on the larger pipes.
I'm wondering if these results would match reality, or if there is an ideal pipe to cylinder volume ratio that would supersede these findings?
TIA


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JanBros




Nombre de messages : 305
Localisation : Belgique
Date d'inscription : 05/12/2011

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MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 13 Icon_minitimeDim 20 Nov 2022 - 11:52

there is limited energy in the exhaust gases. the bigger the center section, the more energy is used for sucking and the less is left for pushing back. so eventualy there will be a tipping point when bigger becomes to big.
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» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)
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» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)
» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked)
» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 3) (Locked)

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