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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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AuteurMessage
Frits Overmars

Frits Overmars

Nombre de messages : 2160
Age : 70
Localisation : Raalte, Holland
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 5) - Page 26 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 26 Icon_minitimeMar 9 Avr 2019 - 18:56

laranjateam a écrit:
How do you calculate the speed at which the maximum power of a motor is achieved?
The answer to your question could easily become a complete book, Laranjateam, but I will try to keep it short and simple.
At each crankshaft revolution we need a certain amount of exhaust port area that has to be open during a certain amount of time, so all burnt gases can leave the cylinder.
After this, we need a certain amount of transfer port area that has to be open during a certain amount of time, so the fresh mixture can flow from the crankcase into the cylinder.
The port areas depend on the heights and widths of the ports.
The available time during which the ports are open, depends on their timing angles, divided by the engine rpm: when the crankshaft turns twice as fast, the available time is halved.
If the crankshaft turns too fast for the available port areas, the ports will close again before sufficient exhaust gas has been removed and substituted by fresh mixture; the engine runs out of breath.
=======================================
The exhaust gases must leave the cylinder before the transfer ports start to open; otherwise a part of the exhaust gas would flow into the transfer ducts. The exhaust port area above the transfer ports, multiplied by the port timing angle during which this area is open, is called the blowdown angle.area.
Blowdown angle.area is not simply the total blowdown area multiplied by the total blowdown angle.
It is the sum of a lot of small area steps, multiplied by the time during which each of these steps is open.

For example, let us assume that the exhaust port is a simple rectangle, 40 mm wide, that it opens 1 mm further for each degree of crankshaft rotation, and that the total blowdown angle from the point where the exhaust port is beginning to open till the point were the transfer ports are beginning to open, is 30°.
Then the first degree of exhaust opening will open an area of 40 mm x 1 mm = 40 mm², and this area will be open during the whole 30° of blowdown period. That first area thus has an angle.area of 30° x 40 mm² = 1200°mm².

When the crankshaft turns 1 degree further, an additional area of 40 mm² is opened. This second area will be open during 29°, so its angle.area is 29° x 40 mm² = 1160°mm².

Repeat this calculation for each crank degree until the end of the blowdown phase, and add all the angle.area values;
this will give you the total blowdown angle.area.

In reality this calculation is complicated by the fact that not every degree of crank angle gives the same port height difference, and even more complicated by the fact that the exhaust port is not a simple rectangle. But you will understand the principle of angle.area.
==================================================
The tranfer port area, multiplied by the port timing angle during which this area is open, is called the transfer angle.area.
As an example, let's assume a transfer port with a timing of 130°.
When you turn the crank 1º past Transfer Open, a certain area of port, say A1, will be exposed. I don't know or care what that area is, that's for you to measure.
That area of port A1 will be open for 130º. The angle.area for this area A1 is = 130 x A1.
Turn the crank another 1º and an additional area of port, A2, will be opened.
This additional area A2 will be open for 128º. The angle.area for this area is = 128 x A2.
The next degree of crank rotation will open Area A3 which will be open for 126º and its angle.area will be 126 x A3.
Keep going like this until BDC, then add up all the angle.areas you have calculated.
The total sum is the angle.area for that transfer port.
=====================================================
The exhaust port timing should be about 190°. Explaining the reason, called wave superposition, would make this simple story too complicated, but you can find the explanation elswhere on this forum and on  http://www.kiwibiker.co.nz/forums/showthread.php/86554-ESE-s-works-engine-tuner?p=1130172752#post1130172752

The transfer port timing should be about 130°. Any higher, and the blowdown angle, that starts when the exhaust ports begin to open, and ends when the transfer ports begin to open, would become too small.
Because the transfer timing is more or less fixed, we try to make the total transfer port width as big as possible:
almost the total cylinder circumference of a modern competition engine is occupied by transfer ports.
======================================================
When we have established the values for blowdown angle.area and transfer angle.area, we can divide these values by the engine rpm. That gives us the blowdown time.area and the transfer time.area.
And when we divide those time.areas by the volume of cylinder plus combustion chamber, we find the Specific Time.Areas, usually abbreviated to STA.
A modern competition two-stroke engine should have a blowdown STA of 8,72°mm² per cc per 1000 rpm, and a transfer STA of 66,16°mm² per cc per 1000 rpm.
You can find some more information about the subject here:
[Vous devez être inscrit et connecté pour voir ce lien]
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laranjateam



Nombre de messages : 15
Localisation : Palmela Portugal
Date d'inscription : 04/03/2012

[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 26 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 26 Icon_minitimeMer 10 Avr 2019 - 23:27

Thank you Very much, Mr Frits.
I will read and reread to try to understand the information left in these lines.
All the best for you and your family.
Thank you.
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