Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines
The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: Raphael on September 12, 2020, 11:04:49 am
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Bonjour,
As a lot of you guys are happy with the Microcosm M92 Hit & Miss, I have decided to buy one, but it is a little bit expensvive for me.
I have discovered that it was commonly sold on auction in eBay by the two Jin's sellers with a very lo starting price.
I tried to bid several times, but so far without success, the auction ended either overnight or during my working days. So I stayed that day in front of an auction ending at 5 PM ... and I finally won! I save about 15% on the price of Jin's site.
I would receive it on November... I will share with you the next steps with videos of course ;)
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Looking forward to your videos, I’ve picked up a few good ebay buys from Jin in the past as well.
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Yes, once the market gets saturated with a new model...the price usually drops to what I'm willing to pay.
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Bonjour Bruce,
With the auction game, the sellers are doing funny, they are smart so it is not obvious to save money ;)
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Bonjour,
Just to make you laugh... Chinese customs refused to send my package and returned it to the sender ... I have saved a few euros, lost already several weeks, will I receive my engine...? I hope that my adventure will not turn into a series with many episodes before its epilogue, happy I hope.
Did you live the same "experience" ?
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Hope you get this sorted out quickly Raphael.
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Bonjour,
HELP !
Despite hours of efforts to try to adjust the carburetor needle screw of my M92, received today, it does not want to start, any idea is welcome :
https://youtu.be/hDTvBCb4dmU
https://youtu.be/RMbxq3mFXX0
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Bonjour,
Thanks to Gil's adice, I hae made some progres, but it is not yet correctly running, too slow to hit then miss and not reliable...
https://youtu.be/npirJrWDueI
https://youtu.be/OKdCvCMZwrE
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Hello, I am sorry to see these, we have analyzed it, it is very likely that different fuels are mixed with carburetor. (We use gasoline test)
Suggestion: Please remove the speed limiter. Start the engine deeply, and adjust the carburetor when the engine is started. Reinstall the speed limiter after it reaches a better running speed!
Jin
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Bonjour Jin,
Thank you for your reply. What do you call the "speed limiter" ? is it the governor ?
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Hi Raphael, After starting it first try gentle adjustments to the needle valve. I have had to open it nearly a full turn on occasion. Once running, I open it slowly until it is running better. Once it warms up a little more I can close it slowly then move it just a little at a time until I have the best run position.
Are you mixing a little oil with your fuel?
Before the run.....
Do you tip the engine on it's nose to put a couple drops of oil on the piston skirt and bore when the piston is at top dead center.
You can also put a couple drops of acetone in your fuel to help it vaporize better.
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Bonjour Gil,
Thank ypu again for your precious help. Yes, I have added a drop of oil and also oiled the cylinder, there is no bad friction.
I like your idea to add some acetone, will test it and let you know what happens.
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Last episode,
Gil, I have added a drop of acetone, there is some progress but it does not want to run more than several tens of seconds.
A degree of difference on the needle changes everything, it is too sensitve... And I have tried to open or close the needle hundred times...
https://youtu.be/n6tc_hxdqF4
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Bonjour,
Thanks to Gil's (and Dominique's) advice, my M92 can empty its fuel tank ;D
Do you change a little bit the setting of the needle valve when the engine becomes hot ? I feel like obliged to close it a little bit to start the engine then reopen it (a few degrees) after a little while.
And as the screw on the bottom of the cylinder is M3, corresponding to M3 oilers I had also bought to Jin, I have installed one and used my steam oil.
https://youtu.be/Q91Ju0Peu2Q
I go on ignoring why it does not accelerate...
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I am glad that you got it running. I have my spark plug gap at around 0.6mm. I have also found that different fuels (lighter fluid and ordinary petrol work best with slightly different settings on the carburettor needle valve. On my engine, the setting is around one quarter of a turn out from being screwed in.
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Bonjour Tony,
My plug gap about 1 mm, I will shorten it again. Do you think it has an impact on the speed of the engine ? Can you change the speed of your engine ? Is it faster than mine ? Do uou change the setting of the needle valve when your engine becomes warmer ?
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@Raphael just saw your latest video, you have your engine running very well now :)
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Bonjour Tony,
My plug gap about 1 mm, I will shorten it again. Do you think it has an impact on the speed of the engine ? Can you change the speed of your engine ? Is it faster than mine ? Do uou change the setting of the needle valve when your engine becomes warmer ?
Bonjour Raphael,
Don't repeat bending the outer spark plug electrode Raphael - it might fatigue and break off. It is very small and you might have to wait a long time for a new one to come from China. You obviously have a good enough spark because the engine runs well now.
On engine speed - I have experimented with removing one of the governor springs on my M90 engine. I could slow it down quite well by doing that, but eventually, the engine stopped on the compression stroke when the energy in the flywheel was too small to compress the fuel air mixture. There are other threads about reducing the compression ratio. Redryder has done this. I do not have the machinery or the skill to attempt that kind of work.
Your governor system is different on the M92 model. There are threads here about shortening the flyball governor spring on the M92. I can not advise you, but it is obvious that you could shorten the spring too much and then not have a spring that was usable any longer.
This video is shows my engine running about as slowly as I could make it run. Any slower and it would stop.
https://youtu.be/5wUPnfAGR0E
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Bonjour Tony,
Many thanks for your accurate reply.
Your M90 runs quite well gently, and we can actually hear its hit & miss process. I thought mine is a little bit too slow because I do not hear the hit & miss process like your one.
Never mind, as it runs, I do not touch to anything now, especially the plug because I agree with you, not obvious to find another one if I break it.
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Never mind, as it runs, I do not touch to anything now, especially the plug because I agree with you, not obvious to find another one if I break it.
They are available, but it will take time to make its way across the planet to you in France.
https://uk.banggood.com/Eachine-ET1-ET5-ET6-ETX-Hit-and-Miss-Gas-Vertical-Engine-Spare-Parts-Mini-Spark-Plug-Accessories-1-or-4-32TPI-p-1573483.html?rmmds=buy&cur_warehouse=CN
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Bonjour Tony,
I order sometimes in China or in Europe, I confirm, I have to be VERY patient... :( but it is so convenient and cheap...
and for fun, scale 1 Hit & Miss engines are also very sensitive to settings :
https://www.youtube.com/watch?v=CglWYuKj0xE
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Hello Raphäel.
Alors, pour la bougie, c'est environs l'épaisseur d'un ongle soit 0,4 a 0,5mm
Pour le pointeau oui env 1/4 de tour d'ouverture, a régler pendant le fonctionnement.
le carburant, jutilire l'essence synthétique Aspen, sa va super bien c'est pour les débroussailleuses tondeuses etc.
J'ai reçu ce moteur cet été, il a démarré a la main au quart de tour au premier essais.
J'ai l'intension de l'améliorer comme mon M90, paliers en bronze, graisseurs, support du réservoir, échappement et base en bois avec Led indiacteur.
Tu maitrise l'Anglais, voudrais tu traduire tout sa et mettre la dessous pour les membres du forum ?
D'avance Merci. Amicalement Christian.
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I do not touch to anything now, especially the plug because I agree with you, not obvious to find another one if I break it.
I bought some of these, arrived in 4 days -
https://www.ebay.com.au/itm/1pc-Rcexl-Advance-1-4-32-Spark-Plug-for-Nitro-Turned-to-Gasoline-Engine/113682699073?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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Alors, pour la bougie, c'est environs l'épaisseur d'un ongle soit 0,4 a 0,5mm
Pour le pointeau oui env 1/4 de tour d'ouverture, a régler pendant le fonctionnement.
le carburant, jutilire l'essence synthétique Aspen, sa va super bien c'est pour les débroussailleuses tondeuses etc.
J'ai reçu ce moteur cet été, il a démarré a la main au quart de tour au premier essais.
J'ai l'intension de l'améliorer comme mon M90, paliers en bronze, graisseurs, support du réservoir, échappement et base en bois avec Led indiacteur.
Tu maitrise l'Anglais, voudrais tu traduire tout sa et mettre la dessous pour les membres du forum ?
D'avance Merci. Amicalement Christian.
So, for the candle, it is around the thickness of a nail or 0.4 to 0.5mm
For the needle yes approx 1/4 of an opening turn, to be adjusted during operation.
the fuel, I use Aspen synthetic gasoline, its going great it's for brushcutters mowers etc.
I received this engine this summer, it started by hand on the first test.
I intend to improve it like my M90, bronze bearings, grease nipples, tank support, exhaust and wooden base with LED indicator.
You master English, would you like to translate all of this and put it below for the members of the forum?
Thanks in advance. Sincerely Christian.
Christian, I have to confess that I regularly use Google traduction ;)
And the needle valve you made for my m91 is very helpful because the original one is too small in diameter to my opinion.
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Hi Raphael
Voici le site d'un fabriquant des US avec des bougies de très bonne qualité
Avec mon modèle M90, aucun problème avec cette bougie + l'essence Aspen.
Here the US webside of very good quality sparkplugs.
No problem with my M 90 engine and this sparkplug + Aspen fuel.
http://sparkplugs.morrisonandmarvin.com/
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Bonjour Alan,
Many thanks for this link, but which reference did you chooze ;) ?