[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4)

At Aprilia we always used dental hand pieces.
D&H if I remember well.
We made about 400 cylinders a year, working in a team of 3.
We broke maybe 2 or 3 a year, which was not so bad in my opinion

Nombre de messages : 38 Localisation : valencia Date d'inscription : 03/03/2015

I use disposable, with 2 or 3 per cylinder is sufficient, works out cheaper than a new high-quality and then it can spoil

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Nombre de messages : 362 Localisation : Belgique Date d'inscription : 05/12/2011

what burs/stones/whatever do you use ?

Nombre de messages : 1 Localisation : italy Date d'inscription : 05/02/2015

to Frits: what about Ryger Engine?

ridgeback a écrit:: to Frits: what about Ryger Engine?

It is spectacular. It is a 125 cc kart engine with the 30 mm Dellorto carb and the low compression ratio that are mandatory for kart engines but nevertheless it produces 70 HP at 17500 rpm as compared to the 54 HP at 13000 rpm of the Aprilia RSA.
It uses regular Euro-95 petrol without oil added to it, its fuel consumption is more economical than conventional two-strokes and there are over 80% less emissions.

The Federal Internationale de l'Automobile has approved the Ryger homologation last saturday.
Some patents are still pending and this is the reason I cannot tell more about the engine yet. As soon as the patents are granted I will give more details.
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Nombre de messages : 38 Localisation : valencia Date d'inscription : 03/03/2015

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70cv with 125cc 30mm carburetor in there ?? ... there can only be magic ...

Nombre de messages : 8 Localisation : Trier Date d'inscription : 18/05/2014

Wow, that sounds incredible.

Can't wait for more information on that engine.

vin97 a écrit:: Wow, that sounds incredible.

Can't wait for more information on that engine.

You are not the only one, many licence requests too !!

Nombre de messages : 57 Localisation : DFW,Texas Date d'inscription : 15/11/2013

Has eleven ducks, huh ?

Well OK !

Nombre de messages : 6 Localisation : Germany Date d'inscription : 18/07/2012

Jan or Frits how much port offset (undersize) was needed to get the casted duct grinded on spec?
How was the template build and applied?

And Frits was there any offset for your FOS cylinder and the SLM process needed?

Thank you guys very much!

about 0,2mm

nine-thirtysix a écrit:: Frits was there any offset for your FOS cylinder and the SLM process needed?

Less than 0,1 mm.

Ryger production is running in high gear in order to meet the CIK regulations.
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Il est très intéressant ce moteur RYGER 125cc de 70HP: le plus puissant 2T jamais construit? avec une simple admission à clapets. Si l'Aprillia de 54 Hp à 13000 rpm pouvait monter à 17500 rpm ( comme le Ryger) en conservant son efficacité de respiration, il développerait 73 hp, soit une puissance voisine, mais est-ce possible? Il semble que cette bride brillante à la base du cylindre soit une partie du "secret" du rendement. Les très faibles émissions sont aussi un des aspects remarquables de ce moteur. Nous attendons avec impatience de plus précises informations ( lorsque possible) de la part de Frits qui a peut être travaillé sur ce moteur aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 809262

aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 809262

aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 980796

Dan

Dan42 a écrit:: Il est très intéressant ce moteur RYGER 125cc de 70HP: le plus puissant 2T jamais construit?

To the best of my knowledge: yes.

Citation :: Si l'Aprillia de 54 Hp à 13000 rpm pouvait monter à 17500 rpm ( comme le Ryger) en conservant son efficacité de respiration, il développerait 73 hp, soit une puissance voisine.

Yes Dan, if we look at the Mean Effective Pressure, Jan Thiels achievement is still unsurpassed. The virtue of the Ryger engine is that it can maintain this high MEP value at much higher revs, and with a lower specific fuel consumption.

Citation :: Il semble que cette bride brillante à la base du cylindre soit une partie du "secret" du rendement.

That is right Dan.

Citation :: Les très faibles émissions sont aussi un des aspects remarquables de ce moteur.

The Ryger's power and its capability for ultrahigh revs are impressive but if we look at the big picture, the 80% emissions reduction is the most important aspect. It may initiate the return of the two-stroke as the prime type of combustion engine.

Citation :: ... Frits qui a peut être travaillé sur ce moteur.

The Ryger engine was entirely designed and developed by Harry Ryger. I am very happy to be part of the Ryger team now and I am eager to contribute to its further development. Who knows where this will end...

La course “motrice“ paraît très importante? Il semble que tout se passe au niveau du bas moteur? scratch

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Merci Frits pour tes commentaires.
Dan

Don't worry, Frits; even in french, it doesn't mean anything.... Very Happy

_________________
Un p'tit clik vaut mieux qu'une grande claque; c'est Harry qui l'a dit! [Vous devez être inscrit et connecté pour voir cette image]

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Jan Thiel a écrit:: At Aprilia we always used dental hand pieces....We made about 400 cylinders a year...We broke maybe 2 or 3 a year, which was not so bad in my opinion

Not bad at all. But then there are dental handpieces and dental handpieces.
Some you'll find at a dental surgeon's ; some you are more likely to find in a Zoo.
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Course motrice: Moment durant lequel l'équipage mobile reçoit, via la pression liée à la combustion exercée sur la calotte du piston, l'effort maximal (avant l'ouverture de la lumière d'échappement dans le cas d'un moteur 2 temps).

Power stroke: Time during which the moving element receives, via the pressure of the combustion exerted on the piston crown, the maximum force (before the opening of the exhaust port in the case of a 2-stroke engine ).
Marc: aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 629615

aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 629615

aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 167764023

ridley a écrit:: La course “motrice“ paraît très importante? Il semble que tout se passe au niveau du bas moteur?

Course motrice: Moment durant lequel l'équipage mobile reçoit, via la pression liée à la combustion exercée sur la calotte du piston, l'effort maximal (avant l'ouverture de la lumière d'échappement dans le cas d'un moteur 2 temps).
Power stroke: Time during which the moving element receives, via the pressure of the combustion exerted on the piston crown, the maximum force (before the opening of the exhaust port in the case of a 2-stroke engine ).

I got it now, Ridley. Let's go easy on Marc though.
Google Translator: aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 629615

Yes, the power stroke is important, but that does not make the Ryger different from any other engine.
And like in any other engine, some things happen in the engine cases, but most of it happens higher up.

About Marc it's only humor. aprilia - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4) - Page 38 809262

What is the utility of the tank topped of a filter that we can see near the carburetor?

Is there something like a double diameter piston for precompression, a bit like the old Norton engine ???

» [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)
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