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Member postings for Charles 2010

Here is a list of all the postings Charles 2010 has made in our forums. Click on a thread name to jump to the thread.

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Thread: Scale model Economy hit & miss engine builders wanted
27/11/2010 21:05:40
Posted by John Wood1 on 27/11/2010 11:55:55:
 I picked up a small electronic strobe off the internet, it's the type which triggers from a small piece of white reflective tape stuck onto the wheel, it all works fine and was not too expensive (about £20 as I remember).
 
 
 
Any more details you can give to lead me to the one you bought ...??
27/11/2010 21:02:27
Hi Andrew
 
I put the design on the forum so that other can use it ..  At the air entry end I did progressively bell out the end with 20 then 30 then 40 then 50 deg cuts which i hope you can make out from the pictures.  So I bored the first angle as stated and the just went in from the end so the the edge is quite thin .. Again I hope that can be seen from the drawing ..  I have also made a choke to go on the end ...
 
the integral non return vave works a treat  but I do hope to make a bird feeder type fuel tank such that the level in the lower tank start just a small amount below the entry to the carb ...  This is just thoughts at the momnet but the carb is proved.
 
If you want more detail let me know ..
 
Rgards Charles
Video can be seen here -- follow the links on the pages to Economy engine  then video

Edited By Charles 2010 on 27/11/2010 21:03:50

27/11/2010 18:10:03
Thanks for the comments John.
 
the strip down revealed the follow ing problems:-
1. that the main bearing had been moving in their seats - solution - the oilers have been made with M5 connection and this has been taken right into the bearings to prevent rotation.
2. the big end had slight end float  - solution - a slight filing of the end piece take up the slack
3. the speed lever did not allow operate - solution - much lighter spring used  and the minimum position noted
 
and also  the good points:-
1. that the piston is as good as new
2. that there is no wear noticed o nthe gudgeon pins and end caps
 
When all is bolted back down and photos taken it will have another run ...
 
Regards Charles
26/11/2010 17:49:41
A chum of mine is designing a 555 timer strobe so that I can get a good idea as to when my engine is doing that sort of speed ..
 
If it is successfull I will let you know details via this forum ..
 
Regards Charles

Edited By Charles 2010 on 26/11/2010 18:00:56

26/11/2010 16:08:15
Thank you for pointing me in the direction of the video and he also confirmed about  500rpm is about right for slow running.
 
I also like the external fuel tank !!!!
 
Regards Charles

Edited By Charles 2010 on 26/11/2010 16:09:17

26/11/2010 12:02:03

 
Thanks for all the ideas on a new crank shaft and the pictures are a grat inspiration.
 
Can anyone tell me the correct sort of RPM at which I should aim to operate the engine?  450 tp 1000 RPM ???
 
Regards Charles
25/11/2010 23:47:57
No that sounds a brillient idea about a stepped key way to stop the knocking sound that I get from. the flywheels.
 
I will look into doing that tomorrow even if I need to mill the key way in the crank to clean it up. I must have rushed the job or not taken enough care!!!! 
 
Also however when the crank came apart, a little, it has not gone back exactly aligned so the new crank shaft may be still in order eventually and I may try to turn that from a solid lump. Now there is a challenge.
 
I drew up the cad diagram tonight and found I will need  piece of stock 3" diamter to allow for the size of 5mm between end of crank and the big end and similarly the other end. BUT may be as I am cutting this from solid I could say 2mm each side and then I couldjust about get it out of 2 1/2"  stock.
 
I am building a rev counter  / tacko so I soulh be able to say for certain at what speed  the shaft is turning !!!
 
Regards Charles
25/11/2010 11:48:57
Thanks for the tips Jonathan.
 
I am also going to strip it down completely and have a good look at all the patrs and probably paint it during the re-assembly.
 
It is great to have made a 1910 engine  but I still can experiment with ignition and there are a few other parts to make better ...  such the crank shaft as the key way is not cut well and allow the flywheel to knock against the keys ....
 
All a great learing process ...
 
Regards Charles
25/11/2010 00:08:53
Well here it is running
The smoke soon cleared when the excess oil had burned off - honestly
 
 
The lower hand ( of a friend ) is steadying the ignition box and the upper hand (mine)just steadying the engine  which made the "workmate" rock about a bit too much !!!!

Regards Charles
24/11/2010 17:43:04
24th November 2010
The day that my Economy model engine ran properly for the first time ...
 
I have redesgined the carb and made it to my own drawing below .

You can see more picture in the album.
The most important points I think are:-
 that there is a great deal more air flow around the needle,
that the fuel entry is at the base of the carb
 
So I agree with the other poster that the carb as designed with the engine could well be over engineered.
 
There is still much to sort out as the hit and miss does not engage so likely to be a spring problem as mentioned by another poster.
 
Regards Charles
 
22/11/2010 22:08:40
I have now made a starting handle with atuto disengage ...
 
I hope it will help the starting of the engine ...
 
 
I will remember to keep my thumb out of the way !!!

22/11/2010 18:09:20
More photos on forum
 
Here is the engine ready for testing

22/11/2010 14:20:33

Hi Ian

 I wonder if you have any ideas on dimensions.

 I have been discussing this with other friends with engineering back grounds and they think the the original 4.75mm air entry hole is way too small to feed the engine with an air and fuel mix.

 They are of the opinion that the opening at the centre of the venturi should be say 50% that of the  outer bell which would be about 10mm for this engine.

 Any thoughts on what  you  have tried?

 I am just out to go and buy stock so that I could make up several mixer carbs  that sounds like over kill but a lot of engineering fun .. Thank goodness I am retired.

 Another friend is working on an electronic ignition system where the spark can be advanced and retarded by electronics. I know that gets away from the simplicity of the engine but again will be a lots of fun as I am also a Radio Amateur

   Regards Charles
21/11/2010 22:23:28
Hi David
 
Ok, yes I have tried to take into account all the tips but not yet tried it on Butane ...
 
All I have read points to the carb and it has also been mentioned on here ..
 
I will keep working on it and repart in due coure ..
 
Regards Charles
21/11/2010 22:04:06
I have been in close contact with John but his is a fully prepared kit unlike mine.
 
I have read the posted but I must have missed something saying that John has changed the carb.
 
I will back through then all and carefully digest the information.
 
Regards Charles
21/11/2010 21:46:07
Hi All
 
Yes all going in the right direction .
 
I will check the non return vavle as it is integral with the jet tube.
 
I have been looking in Westbury's book and he suggest a simple carb and I think I may try that ...  I hope my sketch does justice to his idea
 
This does away with the throttle and  ..  A hand can act as the choke.
 
So I am working on that !!!
 
I have pinned the crank and all is well as it went back together easily .. the key ways do not alingn but that does not matter !!!!
 
I will check the tension  of the spring but at the momenthe engine has not reached speed to throw the MISS into gear...  it is fun waiting ...
 
I wish i knew how to make a nice tapered jet screw !!!
 
Regards Charles
 
 

21/11/2010 10:42:38

I did look at that particularly and saw that the govenor had not gone into miss action.
 
It is thought that it is a fuel problem ...  The carb has an integral non return valve that I added to the basic construction so it was not a case of too little fuel we think it might have been too much fuel !!
 
As soon as I have more news I will let you all know ..
 
ragards   Charles.
21/11/2010 00:21:59

Well it was all a bit hit and miss.

 We all gathered at 11:00 and established that fuel was being drawn into the carb so the ignition was attached and on the first pull over it popped and smoked but nothing more than one fire.

 Then during the next 90 minutes everything was tried and we had a second firing of about 5 ignition strokes and then nothing.

After lunch one friend came back round and we fitted the third piston ring with careful attention to width and depth  AND the fact the the rings have a top and a bottom which I did not realise ... was taken in to account and properly fitted.  This gave much more compression than when we left it before lunch.

Then on the first pull again engine did run for 12 revolutions and the stopped and then another pull and it fired and nearly got up to speed but finally petered to a stop.

That was a bit of luck as I then noticed that the crank shaft has moved ...  The Loctite 603 had let go ...  So the repair was made by reapplying 603 but the crank will need to come out and I will be pinning it in all 4 places to stop that ever happening again ...

 We also found at that too much fuel was going into the engine ...

 There is no disappointment on my part for had it run without problems one would not have to work out why will it not run and learn nothing ...  Even motor engineer friend and all his experience is at a loss as to why is does fire but then does not continue to fire....

 We have spark, fuel, compression but that is it ...
 
Any ideas ...  may be a rebuild of the carb to a simplier design???
 
Regards Charles
20/11/2010 00:55:36
Well later today Saturday a few friends and I will be trying to start the engine ...
 
Will it be hit and miss or all misses !!!
 
I will report on progress and what we used for ignition etc in due course .
 
 
Regards to all and thank you for all the helpful comments
 
Charles

 
15/11/2010 08:55:22
Has anyone any details of a full sized carb as it would be interesting to compare with that the one for the model.
 
Thanks for the info on 20 deg BTDC .
 
Regards Charles
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