Engines > From Kits/Castings
Mery Explosive Engine
Sanjay F:
--- Quote from: Chipmaster on September 22, 2025, 08:47:40 PM ---Thanks for the compliments folks.
The engine will be on our MEM table for the Saturday and Sunday of the Midland Model Engineering Exhibition next month.
Andy
--- End quote ---
The engine looks fabulous, well done on a great job; I'm gutted as I was going to be at the exhibition on Saturday, but work yet again is dragging me away. Best of luck with the exhibiton and hopefully one day I'll make it and see both the people and exhibits!
PaulR:
--- Quote from: Chipmaster on September 22, 2025, 09:24:01 PM ---Hi Paul you’re welcome to call in if you happen to be in my area. I think you know I’m about ten miles south of Winterbourne house where you visited our annual do.
Andy
--- End quote ---
:ThumbsUp:
Roger B:
Looking excellent :praise2: :praise2: :wine1: not long until the first trials :) :)
Chipmaster:
Thanks Roger.
Back on the Mery following the Midland Model Engineering Exhibition last weekend. I have spent a few hours sorting out my I F Allman engine that refused to run on the last day of the show, Sunday. It needed a light de-coke including re-grinding the exhaust valve to return it to an easy to start model engine.
Time to decide on an ignition system for the Mery.
For simplicity I think I will use the brass "sparking rocking lever" to trigger the sparks, it just needs to close a circuit at the right moment for each of the two spark plugs.
The sparking rocking lever is situated beneath the intake tract, it's driven by an eccentric.
IMG_2474 by Andy, on Flickr
I need to install insulated contacts beneath the "Explosion chambers" so in preparation I have drilled two blind holes and tapped them 4BA.
IMG_2683 by Andy, on Flickr
IMG_2685 by Andy, on Flickr
Red Arrow = Brass sparking rocking lever
Blue Arrow = position of an insulated contact, one for each spark plug.
Igntion contacts position by Andy, on Flickr
I hope these pulse generators will be sufficient. They only cost about £8 each including post on eBay.
Flickr video
IMG_2692 by Andy, on Flickr
Advertised as DC 3.6V/4.8V/6V/12V High Voltage Pulse Generators on eBay but I haven't been able to get them to work on 4.5v. I have had good results using a small 9v PP3 battery. They're connected to a 12 volt battery in the video which is probably excessive but If they're sufficient to get the engine started and run I'll be happy. If they burn out I can upgrade if necessary.
Andy
Jasonb:
My one works OK on four AA batteries. The spark rate does increase with voltage as Graham's video demonstrates
http://www.youtube.com/watch?v=3_U38qnyTC0
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