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Offline woody1

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Re: My garage projects - always up to something
« Reply #300 on: June 13, 2018, 02:22:53 pm »
Kobus as jy tyd het vertel my asb bietjie hoe werk n reed valve?

Hy SUCK maar hy BLOW nie  :laughing4:

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Offline ClimbingTurtle

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Re: My garage projects - always up to something
« Reply #301 on: June 13, 2018, 02:39:20 pm »
Metrinch spanner / socket

http://www.metrinch-tools.com/website/introductie.php

I sell MetrInch tools - I can quote ex-Jhb if you like?

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Offline Bonk-King

Re: My garage projects - always up to something
« Reply #302 on: June 13, 2018, 07:12:45 pm »
Reed valves still looks ok, will just turn them around.
Back in school days I had a YZ125 which would not rev up and get to the power band. After a lot of troubleshooting we turned the reed valves around and it was right as rain again. Not sure if the valves are meant to go in in a certain direction or whether it was a faulty part. Never really looked for the answer after that.
 

Online Tom van Brits

Re: My garage projects - always up to something
« Reply #303 on: June 13, 2018, 09:08:39 pm »
Kobus as jy tyd het vertel my asb bietjie hoe werk n reed valve?

Hy SUCK maar hy BLOW nie  :laughing4:

Maw met die kompressie stroke is hy toe en as die suier sak 'inject' hy?
 

Offline ktmkobus

Re: My garage projects - always up to something
« Reply #304 on: June 13, 2018, 09:25:48 pm »
Kobus as jy tyd het vertel my asb bietjie hoe werk n reed valve?

Hy SUCK maar hy BLOW nie  :laughing4:

Maw met die kompressie stroke is hy toe en as die suier sak 'inject' hy?

Basies ja, hy suig as die piston op beweeg, sal jou môre gou verduidelik.  :thumleft:
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Offline Sláinte Mhaith

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Re: My garage projects - always up to something
« Reply #305 on: June 13, 2018, 10:21:43 pm »
Hier is 'n animation van die reed valve die swart kleppie wat beweeg.

 
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Offline Sláinte Mhaith

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Re: My garage projects - always up to something
« Reply #306 on: June 13, 2018, 10:23:48 pm »
En 'n seksie deur die valve. Die swart deel is die plaatjie of kleppie wat oop en toe maak. (one way valve)

 
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Online Tom van Brits

Re: My garage projects - always up to something
« Reply #307 on: June 13, 2018, 11:29:34 pm »
En 'n seksie deur die valve. Die swart deel is die plaatjie of kleppie wat oop en toe maak. (one way valve)



Baie dankie, nou verstaan ek hom!  :thumleft:
 

Offline ChrisL - DUSTRIDERS

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Re: My garage projects - always up to something
« Reply #308 on: June 14, 2018, 10:07:55 am »
Gn wonder die groenes hou nie van two strokes, kyk hoe rook daai enjin SM!! :lol8:
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Offline ktmkobus

My garage projects - always up to something
« Reply #309 on: June 14, 2018, 10:15:59 am »
En 'n seksie deur die valve. Die swart deel is die plaatjie of kleppie wat oop en toe maak. (one way valve)



Baie dankie, nou verstaan ek hom!  :thumleft:

Om uit te brei, die volgende verduideliking:  (Ek gaan dit nie so mooi in woorde kan sit soos my vriend Google nie)

In a two stroke engine when the piston moves upwards in suction-compression stroke, sudden pressure drop occurs in the chamber below the piston (crankcase). At this moment fresh air-fuel mixture is sucked from the carburetor to the crankcase. Next, when the piston moves downwards in work-exhaust stroke, this fresh mixture is pushed upwards to reload the combustion chamber. In older, less powerful generations of two stroke engines part of the fresh mixture being pushed out from the crankcase was moving back to the carburetor. Nowadays, a one way valve is used between the crankcase and the carburetor. This valve is called a reed valve and is shown on Pic. 1. Reed valve allows the mixture to move in only one direction – from the carburetor to the crankcase. It prevents the mixture from moving back to the carburetor. In the effect reed valve improves reloading of the combustion chamber with fresh air-fuel mixture. This improves power output of modern two stroke engines.

REED VALVE CARBON PETALS OPERATION



Pic. 1. To the left: suction-compression stroke – reed valve (green) is open. To the right: work-exhaust stroke – reed valve is closed. (Source of all the graphics above: Wikipedia article)

Reed valve design is simple (see Pic. 2): a valve comprises of the case/support to which reed petals (also called “reeds”) are attached. In most, but not all, applications reed petal movement limiter is also used. Due to underpressure created in the crankcase during suction-compression stroke, reeds lift-off allowing fresh air-fuel mixture to pass through. Next, in work-exhaust stroke, reeds close due to its’ own resiliency and overpressure occurring in the crankcase. In the effect, since the mixture cannot move back to the carburetor, more of it is loaded to the combustion chamber.

Reed valve with carbon reed petals by CompoTec



Pic. 2. Gas Gas 125 (left) and Kawasaki KX250 (right) motorcycle reed valves with carbon reeds manufactured by CompoTec

The cycle described  above repeats proportionally to the engine speed usually given in Rotations Per Minute or RPM. This means that reeds can open & close thousands of times per minute. Each cycle, the total of which must be counted in millions, uses a bit of reed petal „life” since pretty much every material has limited fatigue capability.

Typical symptom of reed valve petals damage and/or wear is difficulty to start the engine and uneven/non-smooth working manner. Reeds should be occasionally checked for proper sealing and lack of chipped material or cracks. One of the ways to check for proper sealing is to direct reed valve cone (with reeds outside) towards a strong light source. If no light can be seen from the inside of reed vale assembly this means that sealing is very good. However, when straight, non-pre-curved reeds are used, small gaps up to approx. 0.2mm (0.008in) are usually not a problem. The reason for this is that crankcase pressure fluctuations from underpressure to overpressure make reeds to open as well as to close. Reed petals should always be replaced if material is chipped, usually at the edges, or cracks are visible.

Early reed petals were manufactured from stainless steel sheets. Stainless steel reeds are inexpensive, very durable and have good resiliency. Their main disadvantage is that petal separation usually results in engine damage. Other disadvantage, probably less important for regular user, is reed petal’s mass. The lighter the reed petal and the lower the interia, the better it can “follow” the engine RPM and improve power output. This is why in motorsport composite reed petals were introduced. Initially these were glass fiber based. Later, carbon fiber was used as it offers even better parameters – lower mass and higher stiffness at same thickness. Composite, glass of carbon fiber based, reeds are not that durable as metal ones. However, their significant advantage is that in case of reed petal failure liberated piece will usually not make any damage to the engine. Epoxy based composite is soft in comparison to metal engine parts and is usually “grinded out”.

Optimal reed valve petal thickness and stiffness is usually selected by experience and/or some trial-and-error. Both these parameters, which correspond to each other, impact performance of a two stroke engine. Thin & more flexible reeds improve acceleration and performance at lower RPMs. Thicker & more stiff reeds improve power output at high RPMs. Typical reed petal thickness available at the market ranges from 0.25mm (0.010in) to about 0.5mm (0.020). The most popular and frequently offered are carbon fiber reeds, but glass fiber and sometimes aramid (Kevlar) fiber based reeds are also available.


Wanneer die reed petals effens oopmaak, het jy soms sukses deur hulle om te draai dat hulle weer seël teen die valve body.
« Last Edit: June 14, 2018, 10:19:35 am by ktmkobus »
"If you have men who will only come if they know there is a good road, I don't want them.  I want men who will come if there is no road at all."

-David Livingstone-
 
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Offline Bike_Buddies

Re: My garage projects - always up to something
« Reply #310 on: June 14, 2018, 10:59:05 am »
@ktmkobus

Check jou whatsapp ivm al daai parte  :thumleft:
 

Offline Buff

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Re: My garage projects - always up to something
« Reply #311 on: June 14, 2018, 11:25:37 am »
En daar leer ek ook iets nuut vandag  :thumleft: Kan ek nou huistoe gaan?
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Offline Toffie@2

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Re: My garage projects - always up to something
« Reply #312 on: June 14, 2018, 12:29:23 pm »
Baie lekker leesstof hier Kobus. Ek kom loer elke dag of iets gebeur het.  :thumleft:
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Offline ktmkobus

Re: My garage projects - always up to something
« Reply #313 on: June 14, 2018, 12:33:52 pm »
"If you have men who will only come if they know there is a good road, I don't want them.  I want men who will come if there is no road at all."

-David Livingstone-
 

Offline ktmkobus

Re: My garage projects - always up to something
« Reply #314 on: June 14, 2018, 12:35:45 pm »
@ktmkobus

Check jou whatsapp ivm al daai parte  :thumleft:

Dankie BB  :thumleft:
"If you have men who will only come if they know there is a good road, I don't want them.  I want men who will come if there is no road at all."

-David Livingstone-
 

Offline Sputnik080

Re: My garage projects - always up to something
« Reply #315 on: June 14, 2018, 12:38:05 pm »
Hierdie fred is verseker menigde manne se nuwe daily "addiction"............ek inkluis

Awesome fred, en ons geniet dit baie, dankie vir jou tyd en moeite.
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Offline ktmkobus

My garage projects - always up to something
« Reply #316 on: June 14, 2018, 02:15:23 pm »
En daar leer ek ook iets nuut vandag  :thumleft: Kan ek nou huistoe gaan?

Ek dink nou is 'n goeie tyd.   :thumleft:

Baie lekker leesstof hier Kobus. Ek kom loer elke dag of iets gebeur het.  :thumleft:

Dankie Toffie@2.

Hierdie fred is verseker menigde manne se nuwe daily "addiction"............ek inkluis

Awesome fred, en ons geniet dit baie, dankie vir jou tyd en moeite.

Bly jy geniet dit Sputnik080.  Sę gerus nou en dan iets dan weet ek julle lees nog.  Kritiek is altyd welkom.   :thumleft:



So I went this morning to collect the rim from the powder coating and would you believe the colour is all wrong.   :eek7:  At first they argue with me, but after I politely tell them to just give me an hour or so, I return with the front rim as comparison.  So back to the coating booth and about an hour ago I went to collect it, now matching the front rim. 

Starting lacing and it's getting a bit easier now that I've figured out my own working sequence.







« Last Edit: June 14, 2018, 02:17:04 pm by ktmkobus »
"If you have men who will only come if they know there is a good road, I don't want them.  I want men who will come if there is no road at all."

-David Livingstone-
 

Offline ktmkobus

Re: My garage projects - always up to something
« Reply #317 on: June 14, 2018, 02:26:36 pm »
Also picked up newly fabricated clutch and front brake cables.  The old ones’ sleeves are bent and really sticky.



I’ve managed to source a new piston and conrod kit and can get up to 3 oversize.  Off to the engineering shop first to drop off the barrel.

Due to the damage on the sleeve, I want them to first do a flush bore to see what size piston I need.

There’s also some new levers and other bits and pieces on order which should get here next week.  In that order is also a flywheel puller which I’m waiting for before I continue splitting the motor.


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"If you have men who will only come if they know there is a good road, I don't want them.  I want men who will come if there is no road at all."

-David Livingstone-
 

Online Tom van Brits

Re: My garage projects - always up to something
« Reply #318 on: June 14, 2018, 02:26:55 pm »
Hierdie fred is verseker menigde manne se nuwe daily "addiction"............ek inkluis

Awesome fred, en ons geniet dit baie, dankie vir jou tyd en moeite.

+1  :thumleft:

Beste thread
 

Offline Mr Zog

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Re: My garage projects - always up to something
« Reply #319 on: June 15, 2018, 03:58:40 am »
Hierdie fred is verseker menigde manne se nuwe daily "addiction"............ek inkluis

Awesome fred, en ons geniet dit baie, dankie vir jou tyd en moeite.

+1  :thumleft:

Beste thread

+2   :thumleft:


I wish I had the time and the tools to spend my days fixing up all my stuff...  :drif:

Keep at it Kobus... awesome thread  :thumleft:
Young enough to know I can, old enough to know I shouldn't, stupid enough to do it anyway.