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: Hans de Bruin on January 06, 2025, 08:48:00 am
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Nice work, Hans...!!!
Gil
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Bonjour Hans,
Thank you for this feedback, I will take it in account feedback for my engines as I also suffer a lot to make them run.
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Hey guys,
Just a quick update here that might help others. This little engine had been on the back burner a bit, because I really couldn't get it to run reliably. Sometimes it would run fine, some times it would stop after a bit. Sometimes it would not start at all. I tinkered with the ignition module (two batteries instead of three as advised) and even made a spark indicator tube to see if it was sparking at all. It did, so it seemed. I excluded the ignition and concentrated on the mixture. It seemed to be really sensitive. At some point I contemplated making or buying a new carb. I tinkered with the springs, ordered a set of springs on Amazon. And really I got a bit frustrated.
But at some point I had also ordered new spark plugs from EngineDIY. A while ago. Didn't do anything with them because I had ruled out ignition.
Nevertheless, yesterday I changed the plug for a new one. And......my jaw fell to the floor. In front of me was now a different engine. Hand starts immediately. Runs reliably until the tank is empty. Completely not sensitive to mixture anymore. Runs regularly, consistently. Hit. Coast. Hit. Coast. Hit. A joy to watch and listen. Fell in love with it all over again.
So NOW I'm starting to make a nice stand for it. I had put that off out of frustration.
Anyway, for anyone out there having trouble, replace your Chinese spark plug with a Japanese one. It might make a HUGE difference.
I got it from here https://www.enginediy.com/products/spark-plug-for-toyan-fs-s100-four-stroke-methanol-engine?_pos=4&_psq=spark+plug&_ss=e&_v=1.0 but I'm sure you can buy them anywhere.
Greetings,
Hans
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Merci beaucoup !
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Bonjour Hans,
I have replied to your PM, Hope I did well ;D
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Thanks ! I think the wobble is a camera / vibration thing. This wheel is the one I fixed properly by drilling the set screw locations. I'm now in the process of removing the other one, which has worked itself loose and fix that one accordingly.
I will do all wheels / gears like this. Just a set screw on a shaft is not cutting it on hit & miss engines. Every time it hits it
gets a punch. Of course they rotate over the set screw.....
This is my general idea until now. Nice engine, beautiful piece of work, but needs lots of improvements on sturdiness of construction.
And this is part of the fun, right ?
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Sounds OK & seems to run just fine. I'm a bit concerned about the righ side flywheel, seems to wobble inconsistently...is it tight ?
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Yay ! I fixed the cam follower in place with some superglue. Let's see if it stays in place now. Before every run I feel the flywheels for looseness. And yesterday I found some weaker springs in an old CD drive, and they make a definite difference. It's still a far cry from some of the amazing runs I see on youtube, still running a bit rough and irregular, and I'm still figuring out if too rich or too lean. But it's running, it starts by hand (if it's cold) and it really is a little jewel.
In short: Tinkering Time !!
https://youtu.be/gtIKE73JcI8