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La réclame...
Mots-clés
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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 1) (Locked) - Page 37 Voting16[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 Voting13[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 Voting15 
philwood
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EDOUARD Jean
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Pierre"PhilRead"
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mickey
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Fügner
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Jarno
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yves kerlo
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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 1) (Locked)

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AuteurMessage
Howard Gifford



Nombre de messages : 139
Age : 63
Localisation : Ottawa Canada
Date d'inscription : 01/05/2012

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 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 1) (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) - Page 37 Icon_minitimeMar 26 Juin 2012 - 13:02

Was there a point in the development where more air flow resulted in no more gains in power or is airflow through the engine a function of power output. My theory is that if the pipe is not doing its job properly pushing the mixture back into the motorfrom that increased airflow will besimply lost out the tailpipe. With increased port area increasing airflow does the baffle cone angle need to be increased tohelp push this extra flow back into the motor? |You earlier stated you tried over 200 exhaust designs. Can you post the dimensions of the pipe you found worked best? As a pipe designer and builder I am curious about finding more power with the pipe.

And by the way I would be first in line with my money to buy your book. Two strokes oil runs through the veins of more people than you think. I have every two stroke book an article ever written. Most are full of \BS or gobbledygook but your knowledge is golden and should be recorded in some form. [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 101130
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Frits Overmars

Frits Overmars

Nombre de messages : 2302
Age : 71
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

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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 1) (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) - Page 37 Icon_minitimeMar 26 Juin 2012 - 15:24

Howard Gifford a écrit:
Was there a point in the development where more air flow resulted in no more gains in power or is airflow through the engine a function of power output. My theory is that if the pipe is not doing its job properly pushing the mixture back into the motorfrom that increased airflow will besimply lost out the tailpipe.
Even if increased airflow increases the scavenging losses, it will also help in purifying the cylinder contents.
And even fresh mixture that directly short-circuits from the transfer ports into the exhaust ports, helps in cooling the piston.
Citation :
With increased port area increasing airflow does the baffle cone angle need to be increased to help push this extra flow back into the motor?
No, the baffle cone angle is already optimal; you cannot increase it at will. If you make it too steep, the returning pulse will turn into a shock wave that is very uneffective in pushing anything back into the cylinder.
Citation :
You earlier stated you tried over 200 exhaust designs. Can you post the dimensions of the pipe you found worked best? As a pipe designer and builder I am curious about finding more power with the pipe.
Jan, what do you think of this request?
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wax



Nombre de messages : 60
Localisation : australia
Date d'inscription : 01/06/2012

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 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 1) (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) - Page 37 Icon_minitimeMer 27 Juin 2012 - 0:19

I have seen some engines using copper combustion chambers to help reduce detonation. Whats your thoughts on this, did you try it on the rsa and if so what was the results
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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 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 1) (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) - Page 37 Icon_minitimeMer 27 Juin 2012 - 1:55

Yes, a bridged exhaust was tried.
Of course!
2HP less.
Power is mainly determined by blowdown, which is better with a triple port.
A bridged exhaust is wider at the bottom.
Which means the transfers have to be smaller.
This gives less power.
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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 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 1) (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) - Page 37 Icon_minitimeMer 27 Juin 2012 - 5:32

Howard Gifford a écrit:
Was there a point in the development where more air flow resulted in no more gains in power or is airflow through the engine a function of power output. My theory is that if the pipe is not doing its job properly pushing the mixture back into the motorfrom that increased airflow will besimply lost out the tailpipe. With increased port area increasing airflow does the baffle cone angle need to be increased tohelp push this extra flow back into the motor? |You earlier stated you tried over 200 exhaust designs. Can you post the dimensions of the pipe you found worked best? As a pipe designer and builder I am curious about finding more power with the pipe.

And by the way I would be first in line with my money to buy your book. Two strokes oil runs through the veins of more people than you think. I have every two stroke book an article ever written. Most are full of \BS or gobbledygook but your knowledge is golden and should be recorded in some form. [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 101130

I thought of doing it before I retired to Thailand.
No one wanted to edit it, so nothing came of it.
Then I gave away my tuning books, papers and notes.
So now there is no way I can do it anymore.
I have no photo's, designs or graph's, nothing.
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wax



Nombre de messages : 60
Localisation : australia
Date d'inscription : 01/06/2012

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 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 1) (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) - Page 37 Icon_minitimeMer 27 Juin 2012 - 5:35

Jan Thiel a écrit:
Yes, a bridged exhaust was tried.
Of course!
2HP less.
Power is mainly determined by blowdown, which is better with a triple port.
A bridged exhaust is wider at the bottom.
Which means the transfers have to be smaller.
This gives less power.

Ok That makes sense.
I didnt think about it from that point of view, the exhaust port width at the bottom
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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

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In the end we reduced the width of the bottom of the exhaust port, and also raised the bottom.
That was a little bit better.
Then I stopped working.
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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 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 1) (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) - Page 37 Icon_minitimeMer 27 Juin 2012 - 5:40

Frits,

If you wish you can publish the exhausts sizes at this forum,no problem!
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wax



Nombre de messages : 60
Localisation : australia
Date d'inscription : 01/06/2012

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 Empty
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Jan Thiel a écrit:
In the end we reduced the width of the bottom of the exhaust port, and also raised the bottom.
That was a little bit better.
Then I stopped working.
Im guessing that most of the work has been done by the time the piston gets to the bottom, By raising the bottom of the exhaust you would have had the exhaust port slightly higher than the piston at bdc ??
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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 Empty
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wax a écrit:
Jan Thiel a écrit:
In the end we reduced the width of the bottom of the exhaust port, and also raised the bottom.
That was a little bit better.
Then I stopped working.
Im guessing that most of the work has been done by the time the piston gets to the bottom, By raising the bottom of the exhaust you would have had the exhaust port slightly higher than the piston at bdc ??

Really most of the work must have been done when the transfers open!

We raised the bottom of the exhaust to about 2mm above the piston in BDC.

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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 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 1) (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) - Page 37 Icon_minitimeMer 27 Juin 2012 - 6:50

Once a copper/bronze head insert was tried.
It made no difference to detonation.
Full throttle-detonation ended when we made the transfers as wide as possible.
Thus improving piston cooling.
The problem of part-throttle detonation remained.
Part-throttle causes pre-ignition due to the remaining burned gases.
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GtG001



Nombre de messages : 81
Age : 65
Localisation : Adelaide, Australia
Date d'inscription : 02/06/2012

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 Empty
MessageSujet: Aprilia RSA 125   [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 1) (Locked) - Page 37 Icon_minitimeMer 27 Juin 2012 - 7:00

Really most of the work must have been done when the transfers open!

We raised the bottom of the exhaust to about 2mm above the piston in BDC.

[/quote]

Hi Jan,
Did you do any more tests to see how far you could raise the exhaust port floor?
Had you thought about creating a transfer port under the exhaust port by raising the centre of the exhaust port floor?
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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

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Yes, I did that in 1974, without succes!

At Aprilia I had a cylinder cast, in 2007, with the underside of the exhaust raised to the level of the upper
transfer port height.
It was my intention to lower this until the power became good.
But when I realized that I would be retired when the cylinder would be plated I abandoned it, and had it
CNC machined to 'normal'
A pity!
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wax



Nombre de messages : 60
Localisation : australia
Date d'inscription : 01/06/2012

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Jan Thiel a écrit:
Yes, I did that in 1974, without succes!

At Aprilia I had a cylinder cast, in 2007, with the underside of the exhaust raised to the level of the upper
transfer port height.
It was my intention to lower this until the power became good.
But when I realized that I would be retired when the cylinder would be plated I abandoned it, and had it
CNC machined to 'normal'
A pity!
How dare they.
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GtG001



Nombre de messages : 81
Age : 65
Localisation : Adelaide, Australia
Date d'inscription : 02/06/2012

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Jan Thiel a écrit:
Yes, I did that in 1974, without succes!

At Aprilia I had a cylinder cast, in 2007, with the underside of the exhaust raised to the level of the upper
transfer port height.
It was my intention to lower this until the power became good.
But when I realized that I would be retired when the cylinder would be plated I abandoned it, and had it
CNC machined to 'normal'
A pity!

Jan, in adding the transfer under the exhaust port, were you looking at adding to the main column of fresh charge or allowing the suction of the exhaust to take it out the exhaust port to be pushed back later?
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Jan Thiel



Nombre de messages : 501
Age : 79
Localisation : Bangkok
Date d'inscription : 12/10/2010

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I was looking to add to the main transfer flow.
But the engine gave no power at all and did not rev.
I think the flow of this extra transfer port made a 180° turn, straight into the exhaust!
Maybe this cooled the exhaust gases so that the pipe could not work properly!
Probably the blowdown was not finished when it opened.
It was a little bit lower than the main transfers, and its direction was towards the opposite cylinder wall.


Dernière édition par Jan Thiel le Mer 27 Juin 2012 - 8:16, édité 1 fois
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wax



Nombre de messages : 60
Localisation : australia
Date d'inscription : 01/06/2012

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I am jealous it would be a dream of mine to work with a great team like aprillia and to be able to spend the time looking for extra power, you get to spend there money. So much better
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GtG001



Nombre de messages : 81
Age : 65
Localisation : Adelaide, Australia
Date d'inscription : 02/06/2012

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Having read all of the postings on this topic (gp125-caracteristiques-aprilia-rsa) I get the feeling that it is hard to beat a RSA style rotary valve motor but the KTM has answered the challenge with a Reed Valve motor. As there is very little information about on this motor being posted, can I be bold enough without offending you and ask you if you know how they were able to do this?
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Jan Thiel



Nombre de messages : 501
Age : 79
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Yes, no problem.
Their cilinder and exhaust pipe were copied from Honda.
Their fairing and gearbox were designed by Porsche
Instead of a powerjet they used an injector in the crankcase.
In their last year they had a very good rider, Marc Marquez, but he never won.
When Marquez changed to Aprilia he nearly always won!
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GtG001



Nombre de messages : 81
Age : 65
Localisation : Adelaide, Australia
Date d'inscription : 02/06/2012

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Jan Thiel a écrit:
Yes, no problem.
Their cilinder and exhaust pipe were copied from Honda.
Their fairing and gearbox were designed by Porsche
Instead of a powerjet they used an injector in the crankcase.
In their last year they had a very good rider, Marc Marquez, but he never won.
When Marquez changed to Aprilia he nearly always won!

The HP quoted in the media for the KTM 125GP is 55HP, do you think this is at the gearbox or crankshaft?
Also, they are quoted as using a 39mm Keihin Carburetor but this seems a little small compared to the Aprilia; do you think it is correct or do reed valve motors work better on a smaller Carburetor?

many thanks for your time.
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Jan Thiel



Nombre de messages : 501
Age : 79
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Date d'inscription : 12/10/2010

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The flow capacity is limited by the reedvalve, not the carburettor.
So it makes no sense using a carburettor bigger than 39.
We tried, of course, but it was not better

55 KTM HP is surely at the crankshaft.
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Frits Overmars

Frits Overmars

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Date d'inscription : 12/10/2010

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Jan Thiel a écrit:
Frits, if you wish you can publish the exhausts sizes at this forum, no problem!
OK, here we go, for all two-stroke addicts: the latest exhaust pipes from Aprilia, Honda, Derbi and KTM.

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wax



Nombre de messages : 60
Localisation : australia
Date d'inscription : 01/06/2012

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And we all right click, save image as.
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Howard Gifford



Nombre de messages : 139
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Thank you Frits. Im sure there are a lot of snips and torches being used this week as everyone tries these designs. It is very intersting to me that the Aprilia pipe has no parallel center section. This goes against the norm. Was it found that a tapered center carried the negative wave longer thus evacuating more charge through the motor? Also the last section of the difuser cone is very long and has a relatively steep angle. This would indicate a very high suction from this pipe. I am curious as to the name 102Tubo? What does this signify?
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Marc
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Marc

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Frits Overmars a écrit:
Jan Thiel a écrit:
Frits, if you wish you can publish the exhausts sizes at this forum, no problem!
OK, here we go, for all two-stroke addicts: the latest exhaust pipes from Aprilia, Honda, Derbi and KTM.


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