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

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

Edited by 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 40 324787

Nombre de messages : 728 Localisation : Par ici Date d'inscription : 29/09/2012

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 40 55116

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 40 1768664114

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 40 498886

Angelo

Hummm, l'avait l'air fâché notre ami d'outre Atlantique! pour une petite phrase maladroite ou mal comprise?
Dan

Could the internals be similar to this engine?
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here is the running engine based on an 800 rotax. note the spacer under the cylinders

Here is some section views of the piston assembly. Note the pseuto piston has no rings and transfers all the thrust to clean cylinderwalls with no ports. The actual piston head is bolted to the shaft portion. The whole piston assembly looks a bit heavier than a conventional piston but not a lot when it is all trimmed out to the max
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Very interresting design whith " steam engine" pistons, we can suppose that Ryger design is close to this, but without drawings???????
Dan

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

Dan42 a écrit:: Very interresting design whith " steam engine" pistons, we can suppose that Ryger design is close to this, but without drawings???????
Dan

This engine is big riddle but also looks simple 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 40 771973

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 40 771973

Probably: piston is lubricated with oil from crankshaft chamber, so it can have much better lubrication for hi rpms, piston is longer and crank webs(counterweight) have smaller diameter, when piston is in TDC transfers are also closed under the piston-so no mixing crank oil and fuel, upper part of the crankcase looks classic as we can see shape for transfers and oil groove for main bearing, lower piston ring is not close to upper one?
Front side of carter is mysterious-something goes there-vacum pump?

Sabijator a écrit:: This engine is big riddle but also looks simple
Probably: piston is lubricated with oil from crankshaft chamber, so it can have much better lubrication for hi rpms, piston is longer and crank webs(counterweight) have smaller diameter, when piston is in TDC transfers are also closed under the piston-so no mixing crank oil and fuel, upper part of the crankcase looks classic as we can see shape for transfers and oil groove for main bearing, lower piston ring is not close to upper one?
Front side of carter is mysterious-something goes there-vacum pump?

Not certain for a vacum pomp, i think it's the genuine inlet duct connexion of a quite standard crankcase, it looks very similar with VM 125 kart engines ( Czech Rep.) The cylinder also seems very similar, excepted the inlet duct added in a high position.
Dan

Nombre de messages : 27 Localisation : nancy Date d'inscription : 25/06/2014

Hello,

Considering the Ryger engine picture and if the large crankcase volume is not longer connected with the cylinder and intake track, the different maximum volumes of the elements implicated in " the helmoltz blues of Frits Overmars " ( intake, tansfer ducts, cylinder ) look nearly the same.

It could also ease the global breathing in shortening the travel of the fresh charge and allow some sort of 4 stroke lubrification for the crankshaft.

Does this kind of balance between the maximum volumes of each part play a role in the working efficiency of the globality ?

Thank you

I can't understand 30000rpm with a "standard" 54mm stroke.
What about the piston speed?! It's quite over 26m/s ...
The acceleration will be awsome at TDC or BDC isn't?

scratch

Phytus a écrit:: I can't understand 30000rpm with a "standard" 54mm stroke. What about the piston speed?! It's quite over 26m/s ... The acceleration will be awsome at TDC or BDC isn't?

Yes

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 40 809262

Sure, if I don't make a mistake, at 30000Rpm, with a piston +crankpin of 200gr, the connecting rod supports tension and compression loads of around 3700 daN, incredible on such small 125cc parts. 200gr is probably wrong: too light. 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 40 809262

Dan

Yes ?! ... 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 40 438659

It's awsome or it's "here" that we must seek an ~~answer~~ idea? scratch

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 40 101130

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 40 3186062340

Dan42 a écrit:: Sure, if I don't make a mistake, at 30000Rpm, with a piston +crankpin of 200gr, the connecting rod supports tension and compression loads of around 3700 daN, incredible on such small 125cc parts. 200gr is probably wrong: too light.
Dan

Tu obtiens ça comment?! 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 40 55116

Il y a accélération et décélération à chaque point mort ...

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