AccueilGalerieRechercherS'enregistrerConnexionNouveaux messages depuis dernière visite
Rechercher
 
 

Résultats par :
 
Rechercher Recherche avancée
Qui est en ligne ?
Il y a en tout 27 utilisateurs en ligne :: 9 Enregistrés, 0 Invisible et 18 Invités :: 2 Moteurs de recherche

2stroke4ever, didier, pascaltz, Paulus, popoffe, ptitkreid, Srx56, t2, V888

Le record du nombre d'utilisateurs en ligne est de 355 le Lun 13 Sep 2021 - 12:59
Derniers sujets
» [Oldies] Quizz (26)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeAujourd'hui à 21:58 par spreyer

» [SORTIES] Sunday Ride Classic 2022, 11 et 12 juin
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeAujourd'hui à 20:26 par Joel Enndewell 2424

» [Oldies] 250 PERNOD
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeAujourd'hui à 9:34 par Ed

» (Oldies) Un Pépé, des coques (et accessoirement des poutres)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeHier à 19:19 par yves kerlo

» [Oldies] Un petit bout de l’histoire Morbidelli, 1977-1979
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeHier à 18:32 par spreyer

» [MotoGP] GP de France 2022 au Mans - Les 13 , 14 et 15 Mai 2022
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeHier à 16:06 par EDOUARD Jean

» controle technique moto
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeHier à 15:56 par cat

» [Oldies] Les Suzuki d'usine 50 et 125cc à Bourg en Bresse en 1966
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeHier à 10:50 par pascaltz

» [SORTIES] Vintage Revival Montlhéry mai 2022
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeHier à 10:08 par Dan42

» [Oldies] Jarno Saarinen, la star qui a revolutionné le pilotage (Part 5)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 19 Mai 2022 - 22:41 par DidierF

» [Oldies] Les transporteurs de motos des paddocks
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 19 Mai 2022 - 22:13 par closed

» [Oldies] Des livres sur la course moto
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 19 Mai 2022 - 21:57 par DidierF

» [ oldies ] Les photos de Roger Lohrer
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 19 Mai 2022 - 20:15 par spyderman 32

» Tom Dickie RIP
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 19 Mai 2022 - 11:33 par philwood

» [Fiction] Steak...
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeMer 18 Mai 2022 - 14:03 par janpol84

» Mais pourquoi le pneu AR est plus large?
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeMar 17 Mai 2022 - 20:26 par justin

» CONTROLE TECH
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeMar 17 Mai 2022 - 19:54 par Mykeul

» [Technique] Honda racing des sixties
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeMar 17 Mai 2022 - 16:59 par Dialmax

» Le petit avantage de la Bestia.
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeMar 17 Mai 2022 - 14:08 par Aragon

» North West 200
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeMar 17 Mai 2022 - 7:57 par Aragon

» [Oldies] Honda 6
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeLun 16 Mai 2022 - 18:01 par T54

» [Pit Laners en course!] Clément Révolte (coupe YAMAHA R125)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeLun 16 Mai 2022 - 14:01 par BOOZE

» Alain Michel
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeLun 16 Mai 2022 - 13:24 par janpol84

» Honda Monkey
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeDim 15 Mai 2022 - 11:03 par Joel Enndewell 2424

» [MotoGP] GP 2022 d' Espagne à Jerez - du 29 - 30 Avril et 1er Mai 2022
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeSam 14 Mai 2022 - 11:39 par philwood

» [Oldies] Les Aermacchi deux temps
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeSam 14 Mai 2022 - 8:05 par dulas frederic

» [Oldies] Circuit Bourg en Bresse 1971
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 13 Mai 2022 - 12:45 par DidierF

» [Oldies] Questions (vitesse 1947-1976)
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 13 Mai 2022 - 5:44 par berlu

» [SORTIES] 19 et20 mars 2022 ISSOIRE
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 12 Mai 2022 - 15:35 par Niko

» [Oldies] Honda 50 twin RC113/114/115 /116
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 12 Mai 2022 - 13:27 par T54

La réclame...
Mots-clés
inventaire 2013 zone wanted suzuki coupe 1973 classic bresse yamaha bourg terrot oldies side RACING ducati artisanales charade motos rouge aprilia motobecane ROAD 1976 geco francaises
Meilleurs posteurs
Marc
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
EDOUARD Jean
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
philwood
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
mickey
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
Pierre"PhilRead"
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
yves kerlo
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
Fügner
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
Jarno
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
bubu
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
Dialmax
wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting16wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting13wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Voting15 
La réclame...
Le Deal du moment :
Cartes Pokémon – coffret ETB Astres ...
Voir le deal

 

 [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 
+104
wos
koenich
LeonardoMRF2
Rookie j.
Zrt1200
motori49
F888
pagi
Eric_91
Panas
Charly
polcat88
Adco
Scalvo
tenney
andreas länström
EDOUARD Jean
flatart
Peljhan
RAW
thankspipe
op76
iizquierdo
Fredrikgu
fullgazlolo
Virgil Tripp
Vannik
ReinanRacing
carlovitch1
patouille
taliesin
Laci
Institute of TwoStrokes
tzrcarbonn
Freitas_rt
porttiming124
Döllinger
freret alain
ORC
pascaltz
GtG001
Iker
alextatic
marsheng
Ken Seeber
dutch
Jseb89
uniflow
crayou
Jenco
lvs
50cc
Howell
peter1962
Apriliabarth
41juergen
fd-racing
marlow
Paul Olesen
seattle smitty
bentou
Polux rsv
jona2t
LucF
CVS
alwoodman1
Maurice Specken
pierre95
laranjateam
Manuel Rainer
Forgi
Berglund
alcatelko
williamsmotowerx
lodgernz
jfn2
pfpraider
Mks-Racing
husaberg
cassandre
gab
Toop
Niels Abildgaard
motoholic71
tjbw
Phytus
Howard Gifford
yeahhim
MANETON
ktuningteam
fpayart
Al mach
Rose Noire
Bob van der Zijden
Senne s
Marc
Piquer
JanBros
ambike
Frits Overmars
Jan Thiel
Lef16
yesyes
Dan42
108 participants
Aller à la page : Précédent  1 ... 21 ... 38, 39, 40
AuteurMessage
Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeJeu 26 Mar 2020 - 17:35

josh20 a écrit:
Frits FOS uses Squish Gap and the Squish Center Gap (What i guess is the inner point at the beginning of the Bowl?) to see if the Gap is Parallel or opens Conical.
You guessed right, Josh.
Citation :
So my conclusion is at the moment, the most common told 25-50m/s MSV is a static Value and at least a bit useless... because in the enginge its very dynamic.
Right again.
Revenir en haut Aller en bas
josh20




Nombre de messages : 9
Localisation : Germany
Date d'inscription : 05/01/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 27 Mar 2020 - 8:36

Frits Overmars a écrit:
josh20 a écrit:
Frits FOS uses Squish Gap and the Squish Center Gap (What i guess is the inner point at the beginning of the Bowl?) to see if the Gap is Parallel or opens Conical.
You guessed right, Josh.
Citation :
So my conclusion is at the moment, the most common told 25-50m/s MSV is a static Value and at least a bit useless... because in the enginge its very dynamic.
Right again.

Thank you Mr.Overmars,
i hope you dont mind if i ask another question(s)?

How would it affect the Detonationrisk at Partial Load if the Head is modified to more "Race-specs"?
Because my 500 is rather an Countryroad-Hunter than a Racebike, so it runs often on low load/partial load.
i have the feeling it could be risky. As running long on low throttle openings is not what powerfull Twostrokers like in general...
And would a variable Tailpipe (like your Idea that you posted here) could be usefull for this "low Load"case?
I´m thinking to build some kind of exhaust pressure reduction system in connection to throttle opening, like Cruising around= bigger Tailpipe / Full Throttle = normal Tailpipe.

Best Regards
Josh

Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 27 Mar 2020 - 11:04

josh20 a écrit:
Thank you Mr.Overmars, i hope you dont mind if i ask another question(s)? How would it affect the Detonationrisk at Partial Load if the Head is modified to more "Race-specs"? Because my 500 is rather an Countryroad-Hunter than a Racebike, so it runs often on low load/partial load. i have the feeling it could be risky. As running long on low throttle openings is not what powerfull Twostrokers like in general...
And would a variable Tailpipe (like your Idea that you posted here) could be usefull for this "low Load"case? I´m thinking to build some kind of exhaust pressure reduction system in connection to throttle opening, like Cruising around= bigger Tailpipe / Full Throttle = normal Tailpipe.
Josh, it's very kind of you to address me as Mr. Overmars, but just 'Frits' is good enough for me, 'Mr. Overmars' was my beloved father.
I have no idea what 'Race-specs' are supposed to be; it could mean anything. Maybe you mean a high comression ratio; that would work in a four-stroke, although I would not recommend it for a two-stroke. I'd rather concentrate on an effective, tight squish gap.
My variable tailpipe, shown below, was designed with two objectives in mind: to reduce the torque dip at 2/3 of max.torque-rpm, and to avoid part-throttle detonation. I like your suggestion of using it in connection to throttle opening.
[Vous devez être inscrit et connecté pour voir cette image]
Revenir en haut Aller en bas
josh20




Nombre de messages : 9
Localisation : Germany
Date d'inscription : 05/01/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 27 Mar 2020 - 12:03

Frits Overmars a écrit:

Josh, it's very kind of you to address me as Mr. Overmars, but just 'Frits' is good enough for me, 'Mr. Overmars' was my beloved father.
I have no idea what 'Race-specs' are supposed to be; it could mean anything. Maybe you mean a high comression ratio; that would work in a four-stroke, although I would not recommend it for a two-stroke. I'd rather concentrate on an effective, tight squish gap.
My variable tailpipe, shown below, was designed with two objectives in mind: to reduce the torque dip at 2/3 of max.torque-rpm, and to avoid part-throttle detonation. I like your suggestion of using it in connection to throttle opening.

If its ok for you with Frits, i stay with that...

With "Race-Specs" i meant not high compression...i´ve read already much about this in your Posts (within the low-comp Racer from Langtuning(?) and so on)

I meant more that usually for Roaduse built Twostroker like an TZR/TDR/RGV250 or something like this, is more on an Conservative side of Headdesign... a bit bigger on Gap,a bit lower on Comp,a bit smaller on Area and so on because its for roaduse with maybe not very experienced riders,sometimes bad fuel,lots of low load riding and it should last longer...
If you give such an engine a head thats designed for high msv,thight gaps etc. (Like for Race Use), could this lead to more Detonation when just cruising around? Because you ride often just on the leaner needle,Piston cooling airflow tru the engine is on the lower side and so on.
I guess it would, and there could a variable Tailpipe help to lower the risk of detonation when you just cruise around.

So in my mind there is a Second Tailpipe that is open/closed via a roller/valve on part throttle openings till maybe 3/4 Throttle, where i would shut it for maximum power. And opens again when you have to close the Throttle more than the 3/4...

Does this make sense or complete nonsense?

Best Regard
Josh










Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 27 Mar 2020 - 12:57

Your idea of a second tailpipe makes sense. But your fear of using a combustion chamber with about 50% squish area and a tight squish gap is unfounded. On the contrary: it will promote faster burning and it will make any engine more deto-resistant.
Revenir en haut Aller en bas
josh20




Nombre de messages : 9
Localisation : Germany
Date d'inscription : 05/01/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 27 Mar 2020 - 19:11

Frits Overmars a écrit:
Your idea of a second tailpipe makes sense. But your fear of using a combustion chamber with about 50% squish area and a tight squish gap is unfounded. On the contrary: it will promote faster burning and it will make any engine more deto-resistant.
Thank you Frits,
i think my fear comes from the Bikes common Nickname "Ping King"...and because it comes out of the Factory with an Squishgap/Area Combination that is kinda weird...2,5mm Gap and around 68% Area with 89x79 Bore/Stroke. The Honda Guys arent stupid i guess, so i was a little afraid.
But it was an "Agricultural" Engine, maybe its better for this kind of use and for beeing more failsafe.

I will test my new head and see what happens.
So long, thanks for your Input all over in this Forum.

Best Regards
Josh
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 27 Mar 2020 - 21:57

josh20 a écrit:
Frits Overmars a écrit:
Your idea of a second tailpipe makes sense. But your fear of using a combustion chamber with about 50% squish area and a tight squish gap is unfounded. On the contrary: it will promote faster burning and it will make any engine more deto-resistant.
i think my fear comes from the Bikes common Nickname "Ping King"...and because it comes out of the Factory with an Squishgap/Area Combination that is kinda weird...2,5mm Gap and around 68% Area with 89x79 Bore/Stroke. The Honda Guys arent stupid i guess, so i was a little afraid.
I wasn't familiar with the Ping King nickname but squish dimensions of 68% area x 2,5 mm gap give a squish band volume of no less than 15,6 cc; over 1/3 of the total combustion chamber volume!
That chamber must look like a pancake wearing a bowler hat, and with the giant 2,5 mm gap you can forget about any squish at all.
Ping King indeed. I cannot for the life of me understand why Honda would build and sell something like that.
Revenir en haut Aller en bas
josh20




Nombre de messages : 9
Localisation : Germany
Date d'inscription : 05/01/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeSam 28 Mar 2020 - 6:54

Frits Overmars a écrit:

I wasn't familiar with the Ping King nickname but squish dimensions of 68% area x 2,5 mm gap give a squish band volume of no less than 15,6 cc; over 1/3 of the total combustion chamber volume!
That chamber must look like a pancake wearing a bowler hat, and with the giant 2,5 mm gap you can forget about any squish at all.
Ping King indeed. I cannot for the life of me understand why Honda would build and sell something like that.
Build and sold over almost 10 Years... scratch
You may understand now why i´m afraid. I thought about it over and over again,but didnt understand the reason. And simply thinking these guys are not very clever couldnt be true...
For Scale: Headbolts are 8mm Diameter
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
Revenir en haut Aller en bas
carlovitch1




Nombre de messages : 807
Localisation : Pays Catalan
Date d'inscription : 20/05/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeSam 28 Mar 2020 - 8:17

Josh, if my understanding is correct this is what you obtained by molding inside the original head of your CR500 engine?
Revenir en haut Aller en bas
JanBros




Nombre de messages : 300
Localisation : Belgique
Date d'inscription : 05/12/2011

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeSam 28 Mar 2020 - 10:03

Frits, don't know if you know but your drive.google site with all your pics and info isn't working anymore.
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeSam 28 Mar 2020 - 13:43

Thanks Jan, I'll look into it.
Revenir en haut Aller en bas
josh20




Nombre de messages : 9
Localisation : Germany
Date d'inscription : 05/01/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeSam 28 Mar 2020 - 13:45

carlovitch1 a écrit:
Josh, if my understanding is correct this is what you obtained by molding inside the original head of your CR500 engine?
Yes it is. Its the Factory Head of the CR500 1992/1993-2001 with around 66ccm, nearly 20mm Squishbandwidth and 2,5mm Gap. Molded at TDC with Candlewax.
But now i prefer some kind of 2-Component Silikonkautschuk to get good negatives of transfers/heads.See below(Transfers are TZR...) [Vous devez être inscrit et connecté pour voir cette image]
Revenir en haut Aller en bas
carlovitch1




Nombre de messages : 807
Localisation : Pays Catalan
Date d'inscription : 20/05/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 10 Avr 2020 - 18:35

Good evening everyone, I hope you and families are all with good health.

I have an historical question for Jan and Frits: I read that Jorg Möller did very well when he worked for Van Veen then Morbidelli.
Do you know what he did to the engines, did he developed a special idea to make his engines work so well compared to those days competition?
Revenir en haut Aller en bas
Frits Overmars

Frits Overmars


Nombre de messages : 2485
Age : 73
Localisation : Raalte, Holland
Date d'inscription : 12/10/2010

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 10 Avr 2020 - 19:11

carlovitch1 a écrit:
I have an historical question for Jan and Frits: I read that Jorg Möller did very well when he worked for Van Veen then Morbidelli.
Do you know what he did to the engines, did he developed a special idea to make his engines work so well compared to those days competition?
Jörg Möller worked on all aspects of the engine, and he did a fine job, first at Van Veen, then Morbidelli and finally Minarelli. He was particularly good at designing crankshafts, in cooperation with the German Hoeckle company who produced his designs.
De biggest step forward while working at Van Veen, was after he'd had the opportunity to study a cylinder from the Yamaha 125-4 (pictures) that was lent to him by my friend Ferry Brouwer, who was a Yamaha works mechanic then. By the way, Jörg is celebrating his 76th birthday today.
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
Revenir en haut Aller en bas
carlovitch1




Nombre de messages : 807
Localisation : Pays Catalan
Date d'inscription : 20/05/2018

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeVen 10 Avr 2020 - 19:20

Thanks for your quick answer, Frits ! And for these nice pictures of this incredible machine.
Did I see 9 speeds in the gear box? The powerband must have been super narrow...

In case Jörg is reading us, then happy birthday to you !
Revenir en haut Aller en bas
peter1962




Nombre de messages : 17
Localisation : Belgium
Date d'inscription : 29/10/2012

wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitimeMar 14 Avr 2020 - 10:11

Frits Overmars a écrit:
carlovitch1 a écrit:
I have an historical question for Jan and Frits: I read that Jorg Möller did very well when he worked for Van Veen then Morbidelli.
Do you know what he did to the engines, did he developed a special idea to make his engines work so well compared to those days competition?
Jörg Möller worked on all aspects of the engine, and he did a fine job, first at Van Veen, then Morbidelli and finally Minarelli. He was particularly good at designing crankshafts, in cooperation with the German Hoeckle company who produced his designs.
De biggest step forward while working at Van Veen, was after he'd had the opportunity to study a cylinder from the Yamaha 125-4 (pictures) that was lent to him by my friend Ferry Brouwer, who was a Yamaha works mechanic then. By the way, Jörg is celebrating his 76th birthday today.
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]
[Vous devez être inscrit et connecté pour voir cette image]

Frits, thx for the very interesting pictures ! That yamaha RA31A whas a technical marvel ! Almost unbelievable, that yamaha already had such a well thought of engine design. In an age where aircooled engines where still being used, they had it all. Gear driven waterpump, separated cylindres and cylinder heads, modern crankshaft, a very sofisticated autolube-lubrication system : i see an oil pump and 12 oil lines !

Unfortunately, they stopped in 1969... The successor, the yz 623 was like an agricultural engine, no oil pump, aircooled, no rotary valves... They had all that top of the notch technology that they aquired when they bought Showa Works Ltd, and then they shelved it... wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 584741


For Jorg Möller : and there I was thinking that Jorg Möller was the second best two stroke genius of that era (after Jan of course) but after 50 years we hear that he found the 2Stroke gospel by looking at yamaha...


-------

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





wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 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)   wanted - [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 5) - Page 40 Icon_minitime

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 40 sur 40Aller à la page : Précédent  1 ... 21 ... 38, 39, 40
 Sujets similaires
-
» [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 4)
» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 4)
» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 3) (Locked)
» [GP125] All that you wanted to know on Aprilia RSA 125, and more, by Mr Jan Thiel and Mr Frits Overmars (PART 2) (Locked)

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