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LeonardoMRF2

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» [Endurance] 24 heures du Mans 2020
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeAujourd'hui à 1:11 par RenNa

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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) - Page 44 Icon_minitimeAujourd'hui à 0:07 par yves kerlo

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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) - Page 44 Icon_minitimeHier à 23:35 par bubu

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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) - Page 44 Icon_minitimeHier à 9:46 par EDOUARD Jean

» BULTACO TSS
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeHier à 6:31 par EDOUARD Jean

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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) - Page 44 Icon_minitimeSam 11 Juil 2020 - 19:43 par Le Xav

» [WSBK] 2020
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeSam 11 Juil 2020 - 5:49 par EDOUARD Jean

» Coupes Moto Légende 2020
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeVen 10 Juil 2020 - 15:24 par charlie grouniache

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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) - Page 44 Icon_minitimeVen 10 Juil 2020 - 11:29 par Dan42

» Moto GP 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 44 Icon_minitimeVen 10 Juil 2020 - 9:51 par EDOUARD Jean

» [Technique] Réception à titre isolé d'une moto
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeVen 10 Juil 2020 - 9:18 par mickie

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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) - Page 44 Icon_minitimeVen 10 Juil 2020 - 8:47 par Dan42

» [Oldies] Mettet, Mouscron, Chimay....
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeJeu 9 Juil 2020 - 21:15 par DidierF

» [Oldies] Montesa
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeJeu 9 Juil 2020 - 19:17 par janpol84

» André Luc Appietto
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeJeu 9 Juil 2020 - 17:55 par spreyer

» [Oldies] Les casques de nos champions
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeJeu 9 Juil 2020 - 17:12 par Dukasuz

» [Oldies] Daytona 1970
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeJeu 9 Juil 2020 - 16:59 par Dukasuz

» [Sorties] Calendrier 2020 des manifestations, roulages,....
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeJeu 9 Juil 2020 - 10:19 par cambox

» [Oldies] Ils ont p'loté la belle à culbuter de Varese (2ème partie)
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeJeu 9 Juil 2020 - 9:41 par Ala Zorro

» [Technique] Question : fabriquer un cadre acier ?
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 23:55 par panerai

» [Oldies] Honda 750 Daytona
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 19:00 par Noël

» GP Allemagne Nurburgring 1970
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 18:39 par dubois bruno

» [MotoGP] Valentino Rossi, aujourd'hui...
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 16:02 par jack177071

» [Oldies] Les Suzuki 500 RG ( Part 2 )
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 15:18 par Emmanuel Laurentz

» [Oldies] C'était le bon temps...
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 14:44 par rudgissimo

» [Oldies] Charade 70 - 71
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 10:05 par jack177071

» [Divers] YKC Bricoleur professionel
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMer 8 Juil 2020 - 9:04 par mickie

» [ Oldies ] Jarno Saarinen, la star qui a revolutionné le pilotage (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 44 Icon_minitimeMer 8 Juil 2020 - 8:16 par bubu

» [Oldies] Terrot 175 R,
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeMar 7 Juil 2020 - 17:13 par janpol84

» [Oldies] Daytona 1974
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Icon_minitimeLun 6 Juil 2020 - 22:48 par Jean-Luc Morchio

La réclame...
Mots-clés
side daytona 1976 honda bresse aprilia bourg race coupe wanted suzuki 2013 geco charade ducati 1974 rouge classic RACING eurosport 1973 france zone ROAD yamaha 1980
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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 44 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 44 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 44 Voting15 
philwood
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 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 44 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 44 Voting15 
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) - Page 44 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 44 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 44 Voting15 
Pierre"PhilRead"
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 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 44 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 44 Voting15 
mickey
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 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 44 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 44 Voting15 
Fügner
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 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 44 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 44 Voting15 
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 44 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 44 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 44 Voting15 
Jarno
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Dialmax
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 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 44 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 44 Voting15 
bubu
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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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carlovitch1



Nombre de messages : 394
Localisation : Pays Catalan
Date d'inscription : 20/05/2018

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 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 44 Icon_minitimeVen 29 Mai 2020 - 11:36

OK, thanks Frits and Jan for quick replies. Looks like this company just tries to sell ceramic coating (they do for all sorts of things) without seriously studying the question.
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Frits Overmars

Frits Overmars

Nombre de messages : 2351
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

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carlovitch1



Nombre de messages : 394
Localisation : Pays Catalan
Date d'inscription : 20/05/2018

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Happy Birthday Jan !
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Elmi



Nombre de messages : 1
Localisation : España
Date d'inscription : 11/04/2020

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Muchas felicidades Jan, gracias por compartir tu conocimiento. [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 167764023
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Emmanuel Laurentz

Emmanuel Laurentz

Nombre de messages : 4416
Age : 60
Localisation : PACA
Date d'inscription : 07/12/2009

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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) - Page 44 241515 [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 809262
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LeonardoMRF2



Nombre de messages : 29
Localisation : Brasil
Date d'inscription : 28/04/2019

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Happy Birthday Jan Thiel!
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SLT



Nombre de messages : 136
Localisation : Bourgogne, France
Date d'inscription : 07/06/2014

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Happy Birthday to you Jan !
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Quod et probat

Quod et probat

Nombre de messages : 3
Age : 74
Localisation : South Europe
Date d'inscription : 30/10/2019

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To Jan Thiel!
All the best and many more carefree years!
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motori49



Nombre de messages : 180
Age : 70
Localisation : Turin -Italie Piemont
Date d'inscription : 02/12/2015

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Tanti auguri Jan Thiel il mago dei motori [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 241515 [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 241515 [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 241515
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JanBros



Nombre de messages : 282
Localisation : Belgique
Date d'inscription : 05/12/2011

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Gelukkige verjaardag Jan

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Jan Thiel



Nombre de messages : 507
Age : 80
Localisation : Bangkok
Date d'inscription : 12/10/2010

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Thank's for the birthday wishes!!!!!!!!!
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LeonardoMRF2



Nombre de messages : 29
Localisation : Brasil
Date d'inscription : 28/04/2019

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 44 Empty
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Frits or Jan and who else can help experiments with different materials for connecting rod bearings
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polcat88



Nombre de messages : 15
Age : 55
Localisation : Sarnia, ON
Date d'inscription : 14/01/2019

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Hi Jan and Frits. I posted the following on Kiwibiker but thought I may get more insight from the Aprilia viewpoint at least on here.

I have my 3D printer up and running and am continuing on with my snowmobile drag racing cylinder development project. My hope is to design and build a cylinder using the best design features of proven high output engines, notably the Aprilia RSA and Wobbly's further development from there. There are some design parameters that have to be taken into account. My plan right now is to build a 508cc twin with a bore and stroke of 68 X 70mm. If this produces good results an inline four cylinder of 1016cc would follow. I have tentatively chosen a Honda CR250R flat top piston and would move the ring locating pin to the centre of the c port. The 70 mm stroke was chosen because it is stock in a couple of manufacturer variations and allows close to a square engine at the displacements I am interested in. This setup would target max HP at 9500 RPM and due to the use of a CVT belt drive system which will hold the engine at peak power RPM throughout the run requires no overrev power. Snowmobile engines are conventionally inline twin or triple cylinder designs with the intake on the back side of the engine and the exhaust exiting forward. I will be using stock crankcases and crankshafts and this limits the width of the cylinder. In my case the base of the cylinder is approximately 137.5mm wide. I have scaled up and printed an RSA cylinder at a 68 mm bore and unless I have screwed up, which is entirely possible, the base of this cylinder is approximately 173mm wide. Obviously, I do not have the room to include the large sweeping radii of the transfer passages of the Aprilia cylinder. I have attached a couple of pics to hopefully clarify the situation. I can design the exhaust port and ducting and transfer ports themselves inline with Frits' FOS calculations but am concerned that the transfer passages will be a limiting factor. What is the minimum radius that I can get away with? Or am I fighting a losing battle?

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Frits Overmars

Frits Overmars

Nombre de messages : 2351
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

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polcat88 a écrit:
Hi Jan and Frits. I posted the following on Kiwibiker but thought I may get more insight from the Aprilia viewpoint at least on here.
I can design the exhaust port and ducting and transfer ports themselves inline with Frits' FOS calculations but am concerned that the transfer passages will be a limiting factor. What is the minimum radius that I can get away with?
The reactions on the Kiwibiker forum may be of interest to the Pit-Lane readers, so here is a link:
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Your question: "What is the minimum transfer passage radius that I can get away with?" is a typical example of a simple question for which there is no simple answer. Flattening the transfer ducts will no doubt cost power, but I cannot give you a simple relation between the rate of flattening and the rate of power loss.
Moreover, I'd have to guess as to your definition of "getting away with".  Would you be happy with 95%, or 75%, or even less power?
If you wish to stick to (or are obliged to stick to) the center distance between your cylinder bores, all you can do is try. Or, like Wobbly suggested on the Kiwibiker forum, reduce the bores in order to gain room for the ducts.
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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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