AccueilCalendrierGalerieFAQRechercherS'enregistrerConnexionNouveaux messages depuis dernière visite
Rechercher
 
 

Résultats par :
 
Rechercher Recherche avancée
Qui est en ligne ?
Il y a en tout 22 utilisateurs en ligne :: 2 Enregistrés, 0 Invisible et 20 Invités :: 2 Moteurs de recherche

coupekawa, polcat88

Le record du nombre d'utilisateurs en ligne est de 187 le Lun 3 Déc 2012 - 14:45
Derniers sujets
» [Technique] MotoGP : Ducati
Aujourd'hui à 1:26 par Marc

» [Oldies] Règlement GP 1949
Aujourd'hui à 1:21 par Marc

» [Oldies] Ils ont p'loté la belle à culbuter de Varese (2ème partie)
Hier à 18:50 par damienfollenfant

» [Oldies] Jack Findlay, pilote de légende
Hier à 18:24 par charly7728

» [Oldies] Renzo Pasolini, photos insolites
Hier à 18:08 par damienfollenfant

» [GP] MotoGP et télévision...
Hier à 17:23 par crigar

» [Oldies] C'était le bon temps...
Hier à 16:35 par Dakota

» [Oldies] "Martin Strattom" by ecrrmoto
Hier à 16:11 par ecrrmoto

» [Oldies] Documentation Motobécane
Hier à 15:47 par Mykeul

» [GP] Johann Zarco
Hier à 15:38 par Mykeul

» [MotoGP] KTM
Hier à 13:16 par freret alain robert

» [GP] Fabio Quartararo
Hier à 12:49 par Vivien57

» [Technique] La JBB-Metiss de A à Z...
Hier à 9:54 par BM1150R

» Christophe Guyot
Ven 18 Jan 2019 - 22:13 par Mykeul

» [Oldies] Malheureusement, ils sont partis...
Ven 18 Jan 2019 - 19:05 par ONLYAM

» [SORTIES] Charade Heroes - 22-23 Septembre 2018
Ven 18 Jan 2019 - 18:33 par spirit

» [WSBK] 2019
Ven 18 Jan 2019 - 17:48 par EDOUARD Jean

» Alain Genoud
Ven 18 Jan 2019 - 14:30 par bike70

» [Oldies] Angel Nieto Mike Hailwood ( Part 4 )
Ven 18 Jan 2019 - 13:38 par tripotemascagne

» [Oldies] Encore une BOUGIE !
Ven 18 Jan 2019 - 12:23 par justin

»  [Oldies] Les découvertes de Tonton Hubert (Part 4)
Jeu 17 Jan 2019 - 23:02 par philippe7

» [Oldies] Side-Car: quelques images
Jeu 17 Jan 2019 - 18:51 par enndewell joel

» [Oldies] Les photos d'Eilo Taka-prami
Jeu 17 Jan 2019 - 18:44 par philwood

» [MotoGP] Michelin
Jeu 17 Jan 2019 - 14:32 par Mykeul

» Grégory LEBLANC ....
Jeu 17 Jan 2019 - 12:13 par PLP

» MONDIAL Scugnizzo 75cc.
Mer 16 Jan 2019 - 17:39 par perruche

» [Oldies] Honda 750 Daytona
Mer 16 Jan 2019 - 11:59 par Tonton Hub

» [SORTIE] Amicale - des anciens – coureurs - motocycliste
Mer 16 Jan 2019 - 11:16 par enndewell joel

» [Sorties] Calendrier 2019 des manifestations, roulages, circuits, côtes,....
Mer 16 Jan 2019 - 11:15 par spyderman 32

» [Oldies] Quizz??????
Mer 16 Jan 2019 - 9:40 par MacPepR

La réclame...
Mots-clés
suzuki eurosport RACING 2018 aermacchi fourche triumph icgp ROAD yamaha metiss 1973 aprilia france motobecane zone wanted rouge 1000 ducati coupe geco side classic 2013 moto
Meilleurs posteurs
Marc
 
philwood
 
mickey
 
Pierre"PhilRead"
 
EDOUARD Jean
 
Jarno
 
Fügner
 
yves kerlo
 
janpol84
 
Dialmax
 
La réclame...

Partagez | 
 

 [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)

Aller en bas 
Aller à la page : Précédent  1 ... 21 ... 38, 39, 40  Suivant
AuteurMessage
Vagelis



Nombre de messages : 30
Localisation : Greece
Date d'inscription : 09/07/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Dim 24 Fév 2013 - 0:54

Oh, don't apologize Josh! It wasn't my intention to make you feel bad in any way. Sorry if it looked like so.
Cheers
Revenir en haut Aller en bas
https://s736.photobucket.com/albums/xx5/Vag1-2/
motoholic71



Nombre de messages : 52
Localisation : Lisbon
Date d'inscription : 19/01/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Dim 24 Fév 2013 - 5:18

carefull in buying that because typical 4 stroke car det frequencies are lower around 5kHz and a 125cc 2 stroke is more like 10kHz.
So maybe worth to ask,if that circuit is analog like the one I have,it's just a matter of changing a few capacitors to move the filter's bandwdith center and the seller could do it for you?
Also learn all you can because i suspect that will not be just plug and play.
here's a link to choose freq.based on bore size: [Vous devez être inscrit et connecté pour voir ce lien]
Revenir en haut Aller en bas
Areomyst

avatar

Nombre de messages : 8
Localisation : Haw River, NC, United States of America
Date d'inscription : 05/06/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Dim 24 Fév 2013 - 5:54

motoholic71 a écrit:
carefull in buying that because typical 4 stroke car det frequencies are lower around 5kHz and a 125cc 2 stroke is more like 10kHz.
So maybe worth to ask,if that circuit is analog like the one I have,it's just a matter of changing a few capacitors to move the filter's bandwdith center and the seller could do it for you?
Also learn all you can because i suspect that will not be just plug and play.
here's a link to choose freq.based on bore size: [Vous devez être inscrit et connecté pour voir ce lien]
It is interesting that you quote that very site! Quite some time ago I found that same calculator, and when I entered in my piston diameter of 47.6, I seem to remember it giving me some message about the frequency being "out of parameter". It seems that now it works just fine! Interesting.

Either way, I must be able to easily detect detonation or I fear my 2013 race season will cost me many pistons. It take some time before I can post the results of experienc, but when I can, I will be sure to keep you good people informed.

Kind Regards,

~Josh
Revenir en haut Aller en bas
http://www.thescootergarage.com
motoholic71



Nombre de messages : 52
Localisation : Lisbon
Date d'inscription : 19/01/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Dim 24 Fév 2013 - 12:48

Well if the calculator breakes down or something use this 900/(Pi * r)
r is bore rad
Anyway I'd like to offer whatever help I can,I built a circuit but unforseen circunstances forced me to stop all development(got sacked)
I'm an electronic techn.please I'm very interested on your results since I think my circuit is similar.
At first glance I see poor suply filtering and a few others that make the thing so economic but can be solved.
Good luck and please don't forget us.
Revenir en haut Aller en bas
Zash239



Nombre de messages : 19
Localisation : Belgique
Date d'inscription : 11/11/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Dim 24 Fév 2013 - 19:28

I have a question to Frits :
If I have look right on some pictures, you're using roll bearing on the crank instead ball bearing. I'm interested in the kind of bearing. I'm just rebuilding a 2 Stroke mx engine and I had the idea to swap the ball bearing with roll bearing. I had the idea a few year ago, but the bearing only manged to go up to 11000 rpm.(the one I found)
Do you know the manufacturer of the crank bearing ? Du to the incread friction of the bearing, is there any performance lost ? If I can't find some, I would use hybrid bearing.

Thanks in advance
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 1:47

Zash239 a écrit:
I have a question to Frits :
If I have look right on some pictures, you're using roll bearing on the crank instead ball bearing. I'm interested in the kind of bearing. I'm just rebuilding a 2 Stroke mx engine and I had the idea to swap the ball bearing with roll bearing. I had the idea a few year ago, but the bearing only manged to go up to 11000 rpm.(the one I found)
Do you know the manufacturer of the crank bearing ? Du to the incread friction of the bearing, is there any performance lost ? If I can't find some, I would use hybrid bearing.
You can find it all here, Zash:

[Vous devez être inscrit et connecté pour voir ce lien]

[Vous devez être inscrit et connecté pour voir ce lien] and Manuals/02_2-stroke

There is no increased friction. On the contrary, because of the larger axial clearance (0,4 mm) there is less friction than with ball bearings.
[Vous devez être inscrit et connecté pour voir ce lien]
BC1_1442BA
Revenir en haut Aller en bas
Jan Thiel



Nombre de messages : 470
Age : 78
Localisation : Bangkok
Date d'inscription : 12/10/2010

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 3:26

Of course there is only less friction if there is enough radial clearance.
About 0,05mm clearance was needed.
Many bearings had to be modified by grinding.
The crankshaft needs to have a very free axial movement!
Revenir en haut Aller en bas
julien #41

avatar

Nombre de messages : 523
Age : 34
Localisation : Grenoble
Date d'inscription : 29/12/2009

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 10:05

Zash239, I think that you also have to fit a straight cut primary gear because I think that the MX engine have an helicoidal gear that don't work with roller bearings due to axial effort.

Jan or Frits, can you tell us how the axial movement is stopped with roller bearings? (between the tracks and rollers or other way?)

Thank you for your answers
Revenir en haut Aller en bas
GrahamB

avatar

Nombre de messages : 3457
Age : 56
Localisation : Lyon
Date d'inscription : 19/08/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 10:19

julien #41 a écrit:
Zash239, I think that you also have to fit a straight cut primary gear because I think that the MX engine have an helicoidal gear

Already by the mid '70's, MX engines had straight-cut gears...
Revenir en haut Aller en bas
julien #41

avatar

Nombre de messages : 523
Age : 34
Localisation : Grenoble
Date d'inscription : 29/12/2009

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 10:22

Ok Graham, sorry for this mistake, I thought that because some road two strokes engine still have helicoidal gears.
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 10:32

julien #41 a écrit:
... can you tell us how the axial movement is stopped with roller bearings? (between the tracks and rollers or other way?)
Just take a look at the bearing picture on the previous page. The outer bearing race has a recessed path for the rollers, and there is a collar ring on one side of the inner race.
Revenir en haut Aller en bas
julien #41

avatar

Nombre de messages : 523
Age : 34
Localisation : Grenoble
Date d'inscription : 29/12/2009

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 10:42

Thank you Frits, I asked that because on the RSW manual on Aprilia website the collar is another part and on your first picture the collar is built on the inner race.
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 11:04

julien #41 a écrit:
I asked that because on the RSW manual on Aprilia website the collar is another part and on your first picture the collar is built on the inner race.
Take another look at the picture, Julien. On the complete bearing the collar is lying on the inner race; on the right you can see the inner race and the separate collar.
Nevertheless yours is a good question: originally Aprilia used bearings where the collars were part of the inner race, but these collars would sometimes break. After switching to separate collars the problem was gone.
Revenir en haut Aller en bas
motoholic71



Nombre de messages : 52
Localisation : Lisbon
Date d'inscription : 19/01/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 11:53

Gyro effect=tons
cranks with a ball and a cylindric bearing like most Ktm where the ball is responsible for axial lock on the drive side.That's an affordable way,a C4 ball brg.with polyamide or brass cage for the drive side and a c3 cylindrical roller with the same cage type for the other.Will endure hi rpm use.
Either way I don't think Aprilia RS crank bearings exist in standard sizes with that "loose"ring design.
I think there was a few MX bikes still using helical primaries in the '70s,those which were modified street engines?
Revenir en haut Aller en bas
GrahamB

avatar

Nombre de messages : 3457
Age : 56
Localisation : Lyon
Date d'inscription : 19/08/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 13:18

motoholic71 a écrit:

I think there was a few MX bikes still using helical primaries in the '70s,those which were modified street engines?

Yes, when for instance the Yamaha MX bike was the DT-1 with the lights taken off. But once Honda brought out the "Elsinore" CR125 & 250 in... 72? 73? everyone got a bit more serious and built MX specific motors without the oil pumps and helical gears. Not sure about the European bikes of the era like the Bultaco Pursang, pretty sure the Maico's had straight-cut.

I was only born in 62, so I wasn't so involved in the early 70's
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 15:17

GrahamB a écrit:
everyone got a bit more serious and built MX specific motors without the oil pumps and helical gears. Not sure about the European bikes of the era like the Bultaco Pursang, pretty sure the Maico's had straight-cut.
I wish. Those Bultacos and Maicos still had a primary chain. I used the first Bultaco MX-engine with primary gears, the 360 cc Bandido, as a basis for my 500 cc roadracer. O, the joy of crankshaft bearings moving sideways....
[Vous devez être inscrit et connecté pour voir ce lien]
Revenir en haut Aller en bas
Zash239



Nombre de messages : 19
Localisation : Belgique
Date d'inscription : 11/11/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 19:08

Thanks for all you replies
Luckily my primary gear are cut straight
Revenir en haut Aller en bas
peter1962



Nombre de messages : 13
Localisation : Belgium
Date d'inscription : 29/10/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Lun 25 Fév 2013 - 19:54

GrahamB a écrit:
motoholic71 a écrit:

I think there was a few MX bikes still using helical primaries in the '70s,those which were modified street engines?

Yes, when for instance the Yamaha MX bike was the DT-1 with the lights taken off. But once Honda brought out the "Elsinore" CR125 & 250 in... 72? 73? everyone got a bit more serious and built MX specific motors without the oil pumps and helical gears. Not sure about the European bikes of the era like the Bultaco Pursang, pretty sure the Maico's had straight-cut.

I was only born in 62, so I wasn't so involved in the early 70's

1962 was an excellent year !
Revenir en haut Aller en bas
senso



Nombre de messages : 44
Localisation : Portugal
Date d'inscription : 08/11/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Mar 26 Fév 2013 - 0:16

Good evening to all two stroke lovers!
Let me start by saying that I love to read this epic topic, thank you Jan, Fritz, and all the others that so kindly share your awesome knowledge.

I have a pair of doubts, that would like to ear some opinions, so let me start.
This two photos show an yamaha dt lcde crank-case, it is a 50cc engine, that is going to be a bit modified, with a 43mm stroke crankshaft, 84mm con-rod(should be longer, but the owner doesn't want to buy a longer con-rod, and a 46mm cylinder.
What I would like to know is if there is any benefit in mounting the reed-cage with the reeds opening in the vertical, instead of the more traditional horizontal, I took that idea from a couple 100cc kart engines that use reed cages almost as tall as the entire crankcase, and from the high-end aerox/scooter engines where its very common to see the reeds mounted in the vertical, in my head it makes sense, due to the crankcase shape:
[Vous devez être inscrit et connecté pour voir cette image]

[Vous devez être inscrit et connecté pour voir cette image]



So, is there any advantage, or its a mater of only testing will reveal the true results, or maybe some already outdated/bad idea?
My other doubt is about this post(abbreviated, hope there is no problem in doing that):
Frits Overmars a écrit:

The picture below shows the Aprilia RSA125's blow-down angle.area and transfer angle.area. If you divide these values by the 124,8 cc cubic capacity plus the 8,6 cc combustion volume, and by the 12.500 rpm at which this engines develops its maximum torque, you will find the optimum specific time.areas for blow-down (8,72°mm² per cc per 1000 rpm) and transfer (66,16°mm² per cc per 1000 rpm) .
Your engine should meet these same specific time.area values, so if you know its angle.areas, its cubic capacity and its combustion volume, you can calculate the rpm of maximum torque.
It may be necessary to raise the exhaust timing beyond 190° in order to get the required blow-down angle.area for the rpm determined by the transfers (that is the reason for the RSA's 202° exhaust timing).
[Vous devez être inscrit et connecté pour voir ce lien]

I have another project that involves a 1990 yz 80 engine, 45.6mm stroke with 94mm con-rod, that I will adapt an Yamaha dt 80 italkit cylinder, the cylinder as a 54mm bore(a long way from a square engine I know..), to extract the most from this engine I would like to apply the suggest time areas that Fritz referred in the above cited post, but I think I'm missing something, the engine will have about 104cc, just to make the maths shorter.
The suggested exhaust blow-down time area is 8,72°mm² per cc per 1000 rpm, this leads to:
8.72*104*12 = 10882,56

I'm aiming for 30º blow-down, that gives a blow-down area of 362,7mm2 which seems a bit on the low side, and if I take the values from the image provided I get a strange blow down time :/
14543ºmm2 / 812mm2 = 17,9º

But the RSA has way more than just 17.9º of blow-down, could some one shed some light?

Best regards, and thanks again for all the information and help provided.
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2131
Age : 70
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Mar 26 Fév 2013 - 2:07

I see where you problem lies, Senso. 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 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 40 x 30 = 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 40 x 29 = 1160°mm².

Repeat this calculation for each crank degree until the end of the blowdown phase, and add all the angle.area values; that 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 by the fact that the exhaust port is not a simple rectangle. But you will understand the principle of angle.area.
One final remark: my first name is spelled Frits, not Fritz Wink.
Revenir en haut Aller en bas
senso



Nombre de messages : 44
Localisation : Portugal
Date d'inscription : 08/11/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Mar 26 Fév 2013 - 3:15

I'm so sorry for calling you the wrong name, I will not do it again.

I understand, I need to integrate the area, maths it not really my speciality but I think I can come up with the right numbers, I will open a post in the Technique part of the forum when I have more data and crazy ideas, so to not spam this topic, but thanks for the advices, its all that I need to keep me going in the right direction.
In the case of the italkit cylinder it is a W shaped exhaust port, that might be fun to integrate and arrive to the correct values.

Best regards Mr. Frits
Revenir en haut Aller en bas
Emmanuel Laurentz

avatar

Nombre de messages : 4022
Age : 59
Localisation : PACA
Date d'inscription : 07/12/2009

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Mar 26 Fév 2013 - 10:56

Bonne leçon de logique dynamique, j'ai pris ma dose merci Frits :-) , je voulais revenir sur les temps d'ouvertures et fermeture du distributeur (valve rotative), je post des photos d'un moteur avec la position de la valve au PMH (TDC), la fermeture total du conduit est 86° ATDC

[Vous devez être inscrit et connecté pour voir ce lien]
TDC position

[Vous devez être inscrit et connecté pour voir ce lien]
86° ATDC

Ensuite je cherche à savoir comment relever l'autre valeur angulaire, et quelle méthode utiliser?
Merci pour vos réponses les amies, je me fait ici le porte parole de ceux, qui ne ne comprennent qu'une partie de la distribution rotative.

Je posterais d'autres photos si nécessaire
Revenir en haut Aller en bas
GrahamB

avatar

Nombre de messages : 3457
Age : 56
Localisation : Lyon
Date d'inscription : 19/08/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Mar 26 Fév 2013 - 13:43

Emmanuel Laurentz a écrit:

Ensuite je cherche à savoir comment relever l'autre valeur angulaire, et quelle méthode utiliser?

Désolé Manu, je me sens plus bête que d'habitude cet ap. Qu'est-ce tu entends par "l'autre valeur angulaire" ?
C'est par rapport au début d'ouverture, début de ferméture... ou l'aire d'ouverture en fonction d'angle, dans le même sens que les calcules de blow-down ci-dessus ?
Revenir en haut Aller en bas
Jarno

avatar

Nombre de messages : 8661
Localisation : Imatra sur Seine
Date d'inscription : 10/11/2009

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Mar 26 Fév 2013 - 13:53

Chers amoureux du 2-tps,
Dear 2-stroke lovers,

Je viens de parcourir un nouveau topic qui pourrait vous intéresser, ici :
I just discovered a new topic that might be of interest for you, here :

[Vous devez être inscrit et connecté pour voir ce lien]

Il semble que ce soit seulement une introduction à ce qui sera un topic plus détaillé.
I understand this is only an introduction to what will be a more detailed topic later.


J'en profite pour vous remercier à nouveau de la qualité de vos échanges ici : même un béotien total comme moi prend plaisir à vous lire en apprenant quelques mots nouveaux et quelques débuts de bribes de notions :)

Revenir en haut Aller en bas
Emmanuel Laurentz

avatar

Nombre de messages : 4022
Age : 59
Localisation : PACA
Date d'inscription : 07/12/2009

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   Mar 26 Fév 2013 - 14:07

Tu sais les valeurs sont indiqués tel 86/136 (pour l'exemple), donc sur le moteur ci dessus j'ai effectivement 86° depuis le PMH jusqu’à la fermeture de l'admition ok mais que représente cet angle de 136° et à partir de quand ?

J'ai lu dès la page 24 et suivantes des valeurs de 95/150.

Q: 95° avant fermeture admission à partir du PMH ?
Q: 150° à partir de quand ?

Revenir en haut Aller en bas
Contenu sponsorisé




MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)   

Revenir en haut Aller en bas
 
[GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)
Revenir en haut 
Page 39 sur 40Aller à la page : Précédent  1 ... 21 ... 38, 39, 40  Suivant
 Sujets similaires
-
» WANTED TONY "Barbe-rousse"
» Traduction, help wanted
» Wanted Kader
» Bannière Wanted
» Graphiste Wanted

Permission de ce forum:Vous ne pouvez pas répondre aux sujets dans ce forum
 :: ACTUALITES :: [GP] :: [GP125 (et 250 Snif!)]-
Sauter vers: