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pascaltz, ptitkreid, Srx56

Le record du nombre d'utilisateurs en ligne est de 355 le Lun 13 Sep 2021 - 12:59
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» [Oldies] Quizz (26)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeAujourd'hui à 21:58 par spreyer

» [SORTIES] Sunday Ride Classic 2022, 11 et 12 juin
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeAujourd'hui à 20:26 par Joel Enndewell 2424

» [Oldies] 250 PERNOD
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeAujourd'hui à 9:34 par Ed

» (Oldies) Un Pépé, des coques (et accessoirement des poutres)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeHier à 19:19 par yves kerlo

» [Oldies] Un petit bout de l’histoire Morbidelli, 1977-1979
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeHier à 18:32 par spreyer

» [MotoGP] GP de France 2022 au Mans - Les 13 , 14 et 15 Mai 2022
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeHier à 16:06 par EDOUARD Jean

» controle technique moto
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeHier à 15:56 par cat

» [Oldies] Les Suzuki d'usine 50 et 125cc à Bourg en Bresse en 1966
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeHier à 10:50 par pascaltz

» [SORTIES] Vintage Revival Montlhéry mai 2022
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeHier à 10:08 par Dan42

» [Oldies] Jarno Saarinen, la star qui a revolutionné le pilotage (Part 5)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 19 Mai 2022 - 22:41 par DidierF

» [Oldies] Les transporteurs de motos des paddocks
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 19 Mai 2022 - 22:13 par closed

» [Oldies] Des livres sur la course moto
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 19 Mai 2022 - 21:57 par DidierF

» [ oldies ] Les photos de Roger Lohrer
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 19 Mai 2022 - 20:15 par spyderman 32

» Tom Dickie RIP
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 19 Mai 2022 - 11:33 par philwood

» [Fiction] Steak...
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeMer 18 Mai 2022 - 14:03 par janpol84

» Mais pourquoi le pneu AR est plus large?
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeMar 17 Mai 2022 - 20:26 par justin

» CONTROLE TECH
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeMar 17 Mai 2022 - 19:54 par Mykeul

» [Technique] Honda racing des sixties
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeMar 17 Mai 2022 - 16:59 par Dialmax

» Le petit avantage de la Bestia.
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeMar 17 Mai 2022 - 14:08 par Aragon

» North West 200
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeMar 17 Mai 2022 - 7:57 par Aragon

» [Oldies] Honda 6
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeLun 16 Mai 2022 - 18:01 par T54

» [Pit Laners en course!] Clément Révolte (coupe YAMAHA R125)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeLun 16 Mai 2022 - 14:01 par BOOZE

» Alain Michel
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeLun 16 Mai 2022 - 13:24 par janpol84

» Honda Monkey
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeDim 15 Mai 2022 - 11:03 par Joel Enndewell 2424

» [MotoGP] GP 2022 d' Espagne à Jerez - du 29 - 30 Avril et 1er Mai 2022
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeSam 14 Mai 2022 - 11:39 par philwood

» [Oldies] Les Aermacchi deux temps
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeSam 14 Mai 2022 - 8:05 par dulas frederic

» [Oldies] Circuit Bourg en Bresse 1971
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeVen 13 Mai 2022 - 12:45 par DidierF

» [Oldies] Questions (vitesse 1947-1976)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeVen 13 Mai 2022 - 5:44 par berlu

» [SORTIES] 19 et20 mars 2022 ISSOIRE
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 12 Mai 2022 - 15:35 par Niko

» [Oldies] Honda 50 twin RC113/114/115 /116
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 12 Mai 2022 - 13:27 par T54

La réclame...
Mots-clés
side 1973 bourg inventaire yamaha oldies 2013 charade ROAD bresse artisanales 1976 terrot coupe aprilia motos wanted suzuki francaises rouge zone geco motobecane classic RACING ducati
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Marc
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting15 
EDOUARD Jean
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting15 
philwood
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting15 
mickey
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Pierre"PhilRead"
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yves kerlo
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting15 
Fügner
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Jarno
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting15 
bubu
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Voting15 
Dialmax
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La réclame...
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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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45 participants
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MANETON

MANETON


Nombre de messages : 2031
Localisation : *
Date d'inscription : 26/09/2010

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MANETON

MANETON


Nombre de messages : 2031
Localisation : *
Date d'inscription : 26/09/2010

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MANETON

MANETON


Nombre de messages : 2031
Localisation : *
Date d'inscription : 26/09/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Empty
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Tim Ey




Nombre de messages : 20
Localisation : Allemagne
Date d'inscription : 22/05/2013

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I came for copper and found gold! Thank you so much!
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remix31

remix31


Nombre de messages : 634
Age : 52
Localisation : palavas les flots
Date d'inscription : 14/04/2009

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superbe
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2strokeman

2strokeman


Nombre de messages : 1176
Age : 46
Localisation : au pays du champagne
Date d'inscription : 07/06/2011

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeJeu 28 Oct 2021 - 19:44

Magnifique, j'en bave.....
La culasse est fixée au cadre par des équerres en alu , montage rigide sans silenbloc ?
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Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeVen 29 Oct 2021 - 12:22

2strokeman a écrit:
La culasse est fixée au cadre par des équerres en alu , montage rigide sans silenbloc ?
Contrarotating twins like the Aprilia RSW250 and RSA250, and, previously, the Rotax tandemtwins, can be pretty free of external vibrations.
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2strokeman

2strokeman


Nombre de messages : 1176
Age : 46
Localisation : au pays du champagne
Date d'inscription : 07/06/2011

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Empty
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Thanks for your clarifications Frits. wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 771973
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Eric_91




Nombre de messages : 29
Localisation : Italia
Date d'inscription : 09/07/2019

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Empty
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Hi Frits and jan, I have a questioni for you.
I have an TM 125 k7 cranckshaft unbalanced forward (cranck fall down in direction of rotation). What about this type of modificati in?
Thanks so much
Eric[Vous devez être inscrit et connecté pour voir cette image]
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Adco

Adco


Nombre de messages : 3728
Localisation : Limoges
Date d'inscription : 19/02/2016

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TM K7, c’est du kart ?
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Eric_91




Nombre de messages : 29
Localisation : Italia
Date d'inscription : 09/07/2019

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Empty
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Adco a écrit:
TM K7, c’est du kart ?
Yes it's kart cranckshaft
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Adco

Adco


Nombre de messages : 3728
Localisation : Limoges
Date d'inscription : 19/02/2016

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Empty
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Au cas où ! Ce qu’en disent classiquement les préparateurs de karts….
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Eric_91




Nombre de messages : 29
Localisation : Italia
Date d'inscription : 09/07/2019

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Fantastico, thanks so much adco
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pojoran




Nombre de messages : 4
Localisation : Thailand
Date d'inscription : 11/09/2021

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Dear Frits.
Would you please advise about 2T cylinder head or FOS cylinder head design.
1) what 's effect to head design in case different racing fuel unlead & lead fuel.
(such as Burn perior, Head Volume, Squize area or etc..)
2) If we change fuel from AV gas(Octance100) or unlead racing fuel to VP racing Q16 (Octance116),
basically i can increase compression ratio correct, if you have any advise please
Thank you for your advice.
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Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 9 Icon_minitimeMer 19 Jan 2022 - 16:24

pojoran a écrit:
Dear Frits.
Would you please advise about 2T cylinder head or FOS cylinder head design.
1) what 's effect to head design in case different racing fuel unlead & lead fuel.  
   (such as Burn perior, Head Volume, Squize area or etc..)
2) If we change fuel from AV gas(Octance100) or unlead racing fuel to VP racing Q16 (Octance116),
   basically i can increase compression ratio correct, if you have any advise please
Thank you for your advice.
Dear Pojoran, if you wish to use leaded fuel, you are on your own. I haven't concerned myself with leaded fuel in decades, and I am not going to.

Apart from this, any combustion head shape, irrespective of its volume, should promote the highest possible burn rate. That way you will only need a small amount of ignition advance, which will limit the undesirable pressure rise acting on the piston before Top Dead Center. Furthermore, shortening the burn duration will limit heat loss to the surrounding metal.

Squish is the most effective way of promoting a fast burn rate. Make the squish area parallel to the piston crown and make the squish gap as narrow as possible. If the crankshaft is of good quality, you can use a squish gap of 1% of the stroke.

Different fuels will permit different compression ratios, but contrary to four-stroke practice, two-strokes do not need a high compression ratio for power, so I do not recommend to blindly use the highest ratio that the fuel will permit.
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Howard Gifford




Nombre de messages : 140
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I have a question to ask Frits. We all know the benefits of having a functional "C" port in both a reed valved engine and a rotary valve egine like the RSA but has anyone tried a "C" port in a standard piston port engine. My thought is that a C port in the roof of the intake port that opens after the A and B ports would take advantage of the suction phase of the pipe and allow more fuel charge to enter the cylinder. Has anyone tried this?
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Frits Overmars

Frits Overmars


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Howard Gifford a écrit:
I have a question to ask Frits. We all know the benefits of having a functional "C" port in both a reed valved engine and a rotary valve egine like the RSA but has anyone tried a "C" port in a standard piston port engine. My thought is that a C port in the roof of the intake port that opens after the A and B ports would take advantage of the suction phase of the pipe and allow more fuel charge to enter the cylinder. Has anyone tried this?
There have been plenty engines with a C-port above the inlet, fed through a window in the piston just below the piston ring. But I assume that you mean a C-port in open contact with the inlet port. My friend Ferry Brouwer modified a cylinder in this way and he claimed a power increase. I do not remember the timing of this C-port (it's more than 40 years ago) but it was clearly lower than the A- and B-ports.
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carlovitch1




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I think making the C lower than the others makes sense. I'm afraid that if you close the C-port after the B and A, it may blow the fresh charge direct into the exhaust.
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Quod et probat

Quod et probat


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Date d'inscription : 30/10/2019

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Hallo, if I may tell you about my experiments regarding the -C- additional channel on slot-controlled cylinders.
I have done this on Kawa, TZ 250/350 and some other cylinders. I had to be careful because of the cylinder wall above the intake port. I have milled many different channel shapes in the cylinder wall, with very different results, from -0- to noticeable improvement.  Of course, the drivers' statements as well as my experiences were very varied, as this small change also depended on the rest of the engine's configuration.
I made the -C- slot height dependent on the other overflow windows by milling only 70% to about 95% of their height in the different cylinders. I also changed the piston window in all directions and stuck with a transverse oval shape.
The higher the engine revved, the higher I made the -C-slot.
Unfortunately, this also made push-starting a bit more difficult (at the time).
I also noticed that the peak power did not increase, but the torque improved from the middle, to about 75-80% of the maximum RPM.
I spent a lot of time and cylinders on these experiments (back then) until it worked reasonably well.
Greetings Cara
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carlovitch1




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Thanks for sharing your experience.
When you say from 70 to 95% of the other transfer, do you mean the bottom line of the C-port was positioned at the same level as the other ports or it could have closed after the others as Howard suggested? In other words did you try what Howard says?
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Quod et probat

Quod et probat


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My understanding of -Howard- was ; if someone had routed (milled) a direct duct from the upper intake duct wall (roof), straight up an upright steep C duct into the cylinder on a -slot- controlled engine.
Yes, I did this (tried it) many years ago. So, when the piston is at -BDC-, the extra -C window was only opened 70 to 95% from the height of the other overflow windows. So the -C duct window was only 70 to 95% -high- compared to the other overflow window.
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carlovitch1




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OK. Not sure but I think this was done also on the Aermacchi/HD 250 and 350 at their time of glory (74-75).
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MINGRET01

MINGRET01


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Quand on regarde les docs APRILA sur les dotations de gicleurs principaux il y a une sacré différence entre ceux pour RSA et ceux pour RSW.
Les gicleurs principaux sont bien plus petit pour la RSA quelle explication peut il y avoir à ça?
La position du disque rotatif?
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jfn2




Nombre de messages : 47
Localisation : SW Pa USA
Date d'inscription : 01/06/2012

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Hello quod and probation:
At what RPM was your low rpm trial and what RPM was your high rpm trial? And about the channel shapes, what exactly was the outcome and what did you learn from the outcomes?
Did the piston window have a axial roof also and did the axial roof angle of the c-port match closely with what Frits suggests?
Thank you, Jeff
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Frits Overmars

Frits Overmars


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Date d'inscription : 12/10/2010

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MINGRET01 a écrit:
Quand on regarde les docs APRILA sur les dotations de gicleurs principaux il y a une sacré différence entre ceux pour RSA et ceux pour RSW.
Les gicleurs principaux sont bien plus petit pour la RSA quelle explication peut il y avoir à ça?
La position du disque rotatif?
There should be no difference. But maybe the RSW-data came from an older model, without power jet. That could explain the difference.
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