AccueilCalendrierGalerieFAQRechercherS'enregistrerConnexionNouveaux messages depuis dernière visite
Rechercher
 
 

Résultats par :
 
Rechercher Recherche avancée
Qui est en ligne ?
Il y a en tout 47 utilisateurs en ligne :: 21 Enregistrés, 0 Invisible et 26 Invités :: 2 Moteurs de recherche

2strokeman, Alain Gwada, Blackphc, dbu, Didier LEBRUN, EDOUARD Jean, janobiwan, Jean Philippe Guerrini, julien #41, Mestre, Mighty_V2, missizjolan, MJL, Mykeul, raspoutine, rosco, saccala, singleton560, solexine56, tipierre, yves kerlo

Le record du nombre d'utilisateurs en ligne est de 187 le Lun 3 Déc - 13:45
Derniers sujets
» [Endurance] 24 heures du Mans 2018
Aujourd'hui à 20:23 par yves kerlo

» [MotoGP] GP 2018 des Etats Unis à Austin - 20 , 21 et 22 Avril 2018
Aujourd'hui à 20:06 par sergaï

» [WSBK] Assen 2018
Aujourd'hui à 20:03 par singleton560

» On vit une époque formidable
Aujourd'hui à 19:31 par Rose Noire

» [Sorties] Ventoux Classic 2018
Aujourd'hui à 19:20 par Jean-Rene

» [Technique] La JBB-Metiss de A à Z...
Aujourd'hui à 18:31 par Noël

» [Oldies] Des livres sur la course moto
Aujourd'hui à 17:53 par JH42

» [Oldies] Ils ont p'loté la belle à culbuter de Varese (2ème partie)
Aujourd'hui à 17:37 par Cardamome

» [Oldies] Lino Tonti
Aujourd'hui à 16:23 par philwood

» [Oldies] Interview Eric de Seynes
Aujourd'hui à 12:59 par pascaltz

» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)
Aujourd'hui à 12:47 par Döllinger

» [oldies] Renzo Pasolini, photos insolites
Aujourd'hui à 9:26 par 88 daytona

» [Oldies] MV Agusta : l'histoire des motos d'usine en images...
Aujourd'hui à 8:23 par singleton560

» [Oldies] Les transporteurs de motos des paddocks
Aujourd'hui à 7:58 par bubu

» [FSBK] Le Mans 2018
Aujourd'hui à 5:17 par EDOUARD Jean

» CLONAGE MOTO ELFe CML 2018.2019
Aujourd'hui à 4:47 par EGLI JAPAUTO

» Carnet de piste d'Alex (saison 5)
Hier à 22:14 par Christian7

» Moteur cysy
Hier à 21:20 par woab

» [Technique] La fonderie alu pour les nuls
Hier à 21:10 par alcore909

» [Oldies] Pilotes français des Seventies.
Hier à 17:52 par philwood

» [Oldies] C'était le bon temps...
Hier à 15:51 par 88 daytona

» [GP] FIM, Dorna, IRTA, etc.
Hier à 13:53 par 2strokeman

» [Oldies] Malheureusement, ils sont partis...
Hier à 6:07 par dga

» [GP] Johann Zarco
Hier à 4:37 par singleton560

» [Technique châssis] Listing modèles de suspension AV
Mer 18 Avr - 23:17 par janpol84

» [ oldies ] Angel Nieto Mike Hailwood ( Part 4 )
Mer 18 Avr - 21:45 par philippe7

» [Oldies] Les photos d'Eilo Taka-prami
Mer 18 Avr - 17:55 par Ala Zorro

» [MotoGP] GP 2018 Argentine - 6, 7 et 8 Avril 2018
Mer 18 Avr - 17:32 par philwood

» [Technique] Vilebrequin deux temps
Mer 18 Avr - 17:01 par alcore909

» Circuit de Varano de Melegari
Mer 18 Avr - 16:49 par justin

La réclame...
Mots-clés
side ROAD suzuki icgp aermacchi triumph agusta wanted 1973 norton fourche geco france RACING ducati metiss HOnda 1980 coupe ravel aprilia classic moto eurosport yamaha 2013
Meilleurs posteurs
Marc
 
philwood
 
mickey
 
Pierre"PhilRead"
 
Jarno
 
Fügner
 
EDOUARD Jean
 
yves kerlo
 
janpol84
 
bubu
 
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 5)

Aller en bas 
Aller à la page : Précédent  1 ... 6 ... 8, 9, 10 ... 15  Suivant
AuteurMessage
Bob van der Zijden



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

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Lun 9 Jan - 16:27

Op ebay USA zetten en de hoofdprijs vangen. Reserve op 5000 dollar.
Revenir en haut Aller en bas
alcatelko



Nombre de messages : 32
Age : 35
Localisation : slovakia
Date d'inscription : 26/09/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 13 Jan - 12:05

hi...I have one small question about side rotary valve sealing... It is necessary for good sealing both oil seals as in the picture, or it suffices only oil seal 1 (in the picture)...in kreidler drawings looks that is only one oilseal... thanks
[Vous devez être inscrit et connecté pour voir ce lien]
Revenir en haut Aller en bas
http://www.50cm3.eu
Frits Overmars

avatar

Nombre de messages : 2000
Age : 69
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 5)   Ven 13 Jan - 12:43

# 1 is enough.
Revenir en haut Aller en bas
alcatelko



Nombre de messages : 32
Age : 35
Localisation : slovakia
Date d'inscription : 26/09/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 13 Jan - 13:01

thanks
Revenir en haut Aller en bas
http://www.50cm3.eu
Bob van der Zijden



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

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 27 Jan - 9:30

Just use INA needle bearing seals. Small, low friction and not expensive.
Revenir en haut Aller en bas
Bob van der Zijden



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

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 27 Jan - 14:58

INA Dichtringe Baureihe G Buna S Gummi
Revenir en haut Aller en bas
tjbw



Nombre de messages : 19
Localisation : UK
Date d'inscription : 12/05/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Dim 19 Fév - 19:29

Bob van der Zijden a écrit:
INA Dichtringe Baureihe G Buna S Gummi

Bob, I think you meant Buna N (NBR). It is oil and heat resistant, and good for oilseals.
Revenir en haut Aller en bas
Bob van der Zijden



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

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Mer 1 Mar - 18:35

You're right tjbw, I was wrong. Buna N is the correct quality.
Revenir en haut Aller en bas
Manuel Rainer



Nombre de messages : 98
Localisation : Italy
Date d'inscription : 30/10/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Mer 5 Avr - 19:34

hello

i remember that Jan said: in a cooling system it is best to have
a big radiator with a small amount of water and a pump that has a high l/h rate. and that is better to have the circuit under a good presure of ca. 1,8 bar.
(i hope i remember correct)

Is it possible to use this type of cooling system anywhere? (E.g. In a racing car 4 strocker)

thanks manuel
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2000
Age : 69
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 5)   Mer 5 Avr - 21:23

Manuel Rainer a écrit:
hello i remember that Jan said: in a cooling system it is best to have a big radiator with a small amount of water and a pump that has a high l/h rate and that is better to have the circuit under a good presure of ca. 1,8 bar (i hope i remember correct). Is it possible to use this type of cooling system anywhere? (E.g. In a racing car 4 strocker). thanks manuel
Yes Manuel.
Revenir en haut Aller en bas
Manuel Rainer



Nombre de messages : 98
Localisation : Italy
Date d'inscription : 30/10/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 7 Avr - 19:42

Frits Overmars a écrit:
Manuel Rainer a écrit:
hello i remember that Jan said: in a cooling system it is best to have a big radiator with a small amount of water and a pump that has a high l/h rate and that is better to have the circuit under a good presure of ca. 1,8 bar (i hope i remember correct). Is it possible to use this type of cooling system anywhere? (E.g. In a racing car 4 strocker). thanks manuel
Yes Manuel.

if i don't have a very high water flow, is it better to have more water capacity in the circuit or can we always say: better to have 3 (Big radiator, small Water volume and pressure) of the 4 (high water flow) then only 2.

thanks Manuel
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2000
Age : 69
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 5)   Ven 7 Avr - 23:25

Manuel Rainer a écrit:
hello i remember that Jan said: in a cooling system it is best to have a big radiator with a small amount of water and a pump that has a high l/h rate and that is better to have the circuit under a good presure of ca. 1,8 bar....

if i don't have a very high water flow, is it better to have more water capacity in the circuit or can we always say: better to have 3 (Big radiator, small Water volume and pressure) of the 4 (high water flow) then only 2.
The way you formulated that question gave me a headache Manuel.
More water capacity only means that it will take longer before a stable water temperature is reached. But how high this final temperature will be, depends on radiator capacity and flow velocity.
The function of pressure in the cooling system is to counteract local boiling and so avoid hot spots in the cylinder.
Revenir en haut Aller en bas
Manuel Rainer



Nombre de messages : 98
Localisation : Italy
Date d'inscription : 30/10/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Lun 10 Avr - 19:54

Frits Overmars a écrit:
The way you formulated that question gave me a headache Manuel.
More water capacity only means that it will take longer before a stable water temperature is reached. But how high this final temperature will be, depends on radiator capacity and flow velocity.
The function of pressure in the cooling system is to counteract local boiling and so avoid hot spots in the cylinder.

hello

excuse me firts. and thanks

now it's clear.
can we say it is not possible to have not enough water. if the cooling circuit is made efficient and it is full of water, it is enough. all extra volume addeth means that it will take longer before a stable water temperature is reached.

thanks manuel
Revenir en haut Aller en bas
marsheng



Nombre de messages : 4
Localisation : New Zealand
Date d'inscription : 09/11/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Sam 29 Avr - 7:55

Hi Jan and Frits. Some time back in this thread you mentioned that you had a static dyno for measuring engine power while changing timing etc but found that it didn't work.

I have a inertia dyno and am adding 100hp of brakes to it. I was going to be doing just what you trialed. My thoughts were that inertia dyno just doesn't get air cooled engines up to a stable temp, hence adding the load would improve things. I was going to monitor EGT and CHT while playing with timing and mixture. I may not get the best power out the motor on the dyno but if I can at least get a feeling for CHTs and EGTs with regard to timing and mixture, it will be a  plus.

Any comments?
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2000
Age : 69
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 5)   Sam 29 Avr - 15:24

marsheng a écrit:
Hi Jan and Frits. Some time back in this thread you mentioned that you had a static dyno for measuring engine power while changing timing etc but found that it didn't work.

I have a inertia dyno and am adding 100hp of brakes to it. I was going to be doing just what you trialed. My thoughts were that inertia dyno just doesn't get air cooled engines up to a stable temp, hence adding the load would improve things. I was going to monitor EGT and CHT while playing with timing and mixture. I may not get the best power out the motor on the dyno but if I can at least get a feeling for CHTs and EGTs with regard to timing and mixture, it will be a  plus.
Any comments?
Good thinking Marsheng. But much will depend on the capacity of your cooling.
Imitating the air velocity of a speeding bike will require a huge blower.
Revenir en haut Aller en bas
Bob van der Zijden



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

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Sam 29 Avr - 15:54

In order to get a good air supply apart from using a large blower the air from the blower can be made laminair and the engine tunneld. Not expensive but some more work  Creating a laminair air flow can  be achieved by making a plywood honeycomb structure.
Revenir en haut Aller en bas
marsheng



Nombre de messages : 4
Localisation : New Zealand
Date d'inscription : 09/11/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Sam 29 Avr - 21:00

Hi Jan and Bob

I accept that it may be difficult to match track conditions but my thoughts were,

Set the motor to bottom of the start of the power range,
Start with a low ignition advance, say 14 deg
Set a load and get the bike stabled.
Watch EGT and CHT and increase the advance.
I think at some point, the CHT will start to run away.
Note how many degrees you moved from stable to runaway.
Increase RPM by 1000 and repeat.
Start the whole process again with a different jet.

At the track, if I see the CHT rising, I now have an idea on how much to move the ignition or mixture.

Just typing this out is long, so it's going to be even longer in the dyno shed. !!!

Cheers Wallace.
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2000
Age : 69
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 5)   Dim 30 Avr - 11:12

marsheng a écrit:
... it may be difficult to match track conditions... Set a load and get the bike stabled. Watch EGT...
Setting a load and getting the bike stabled is the complete opposite of matching track conditions, and will cause huge differences in the Exhaust Gas Temperature (better not assume that everybody is familiar with english technical abbreviations on this french-speaking forum, Wallace).
Revenir en haut Aller en bas
marsheng



Nombre de messages : 4
Localisation : New Zealand
Date d'inscription : 09/11/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 5 Mai - 9:42

The problem I have is that I played with 2 strokes 45 years ago when I knew nothing. Now i have done a lot of reading and limited experimental time with my Macio 250 over the past 3 years.

I'm trying to learn a bit quicker than waiting for race days every 6 weeks or so and I would like to work on other 2 strokes so I'm hoping that the braked dyno is going to help me learn much more about cause and effect.

See here 1/2 way down the first page. My reasoning.

[Vous devez être inscrit et connecté pour voir ce lien]
Revenir en haut Aller en bas
marsheng



Nombre de messages : 4
Localisation : New Zealand
Date d'inscription : 09/11/2013

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 5 Mai - 9:43

Post number #8
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2000
Age : 69
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 5)   Ven 2 Juin - 22:34

[Vous devez être inscrit et connecté pour voir ce lien]
Revenir en haut Aller en bas
alextatic

avatar

Nombre de messages : 248
Age : 46
Localisation : Cali (Colombie)
Date d'inscription : 13/11/2011

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Ven 2 Juin - 23:57



Apio Verde to you.
Revenir en haut Aller en bas
Howard Gifford



Nombre de messages : 136
Age : 61
Localisation : Ottawa Canada
Date d'inscription : 01/05/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Mer 7 Juin - 12:43

Hi Jan and Frits. I am building a rotary valve motor using as much of the RSA technology as I can. It is a twin cylinder Rotax 460 cc inline twin using a common rotary valve disc to control both intakes. I plan to run VM44 carburetors. Other engines I have seen have the port necked down to 42 mm. Is there justification to neck it down or do you believe that the inlet should be at least as large diameter as the carbs?
Revenir en haut Aller en bas
Frits Overmars

avatar

Nombre de messages : 2000
Age : 69
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 5)   Mer 7 Juin - 15:04

Howard Gifford a écrit:
Hi Jan and Frits. I am building a rotary valve motor using as much of the RSA technology as I can. It is a twin cylinder Rotax 460 cc inline twin using a common rotary valve disc to control both intakes. I plan to run VM44 carburetors. Other engines I have seen have the port necked down to 42 mm. Is there justification to neck it down or do you believe that the inlet should be at least as large diameter as the carbs?
I can see no reason to reduce the inlet diameter downstream of the carb, Howard, unless it's some rulebook requirement. In fact it helps if the inlet duct downstream of the disc offers a sudden cross flow area increase, by way of a step, opening at the trailing side. This step will act as an anti-reverse treshold when the disc is almost closing and the flow may try to reverse from the crankcase to the outside world.
By the way, the RSA used 42 or 43 mm carbs, on a 125 cc cylinder. This means that your 460 cc twin could do with a couple of 50 mm carbs....
Revenir en haut Aller en bas
Howard Gifford



Nombre de messages : 136
Age : 61
Localisation : Ottawa Canada
Date d'inscription : 01/05/2012

MessageSujet: Re: [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5)   Jeu 8 Juin - 1:17

Thanks Frits that's exactly what I thought. When designing the motor' is a square motor (bore vs stroke) the ideal or do you think slightly over square (longer stroke than bore) is better? The rules limit us to 460 cc and we can choose any bore / stroke combination as long as we don't exceed 460 cc. BTW what 50 mm carb would you recommend? Maybe a pair of Lectrons?

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 5)   

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 5)
Revenir en haut 
Page 9 sur 15Aller à la page : Précédent  1 ... 6 ... 8, 9, 10 ... 15  Suivant

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