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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    Thank you for these comments. I have noticed that various components of the engine (eg. the valves) rust very quickly. I assumed it was the methanol rather than the nitro but nitro makes sense. It's ferocious how quickly rust forms. Anyway, next project is going to be a single cylinder...
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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    Thank you. The compression is certainly high enough: you can really feel it when you are trying to turn the engine over. I reckon it is the recess of the plug. Building a glow plug engine has been a real learning curve. Very interesting indeed.
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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    Thanks for the reply. I might try that. I forgot to mention, in my earlier post, that the engine runs fine while the glow plugs are powered up but, as soon as I switch them off, it stops. I thought glow plug engines only needed the glow plugs powered up for starting. Could this be because...
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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    I was going to post a video of it running but it looks like we can't post videos on here. Have I understood that correctly?
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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    It's been a while! I've finally got the thing running, both as single cylinder engines (I tried each cylinder separately) and, now, today, as the opposed twin it is supposed to be. There were a few things but the main one was the presence of holes in the second ring grooves of both pistons (see...
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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    Thank you all for your very, very helpful replies. I am now focussing on running it as a single cylinder engine until I can get it running. I gave the engine a good going over today, checking dimensions, static compression ratios and valve timings etc. and I have added a couple of spreadsheets...
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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    Thank you very much for your replies. I shall get some photographs to post on here. When I compression checked it, I got a figure of 25psi (spinning the engine with an electric drill). That would be low for a car engine but I don't know if it is low for a model, glow plug engine. The fuel...
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    Homemade 4 Stroke, Opposed Twin Glow Plug Engine - Why Won't It Start?

    Hello, I hope somebody here can help me. I am new to model engines (although my day job is developing car engines) and particularly glow plug engines. A few years ago, I bought some plans for a 4-stroke, opposed-twin, glow-plug engine from VTH in Germany (see attached picture). Earlier this...
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    Starter Dog

    Thanks, Edi. I think that may well be, as you said, easier than trying to make a dog. I'll get onto eBay and see if I can get one of these bearings. I've got to make an engine stand for the little two-stroke engine first as the cheap, MDF one I knocked up the other day is not up to the...
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    Starter Dog

    Yes, I think you could be right. I've bought a cheap dovetail cutter so I reckon it's going to be a matter of trial and error. If that's no good, I'll try one of the other approaches. Thanks for your help. Clem.
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    Starter Dog

    Thank you again for all your help. I've been thinking, recently, that, as it's only going to be small, I might mount the rotary table vertically, clamp the workpiece in a three-jaw chuck on the rotary table and cut the form using a dovetail cutter coming in from the side (see pictures; not...
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    Starter Dog

    Hello Chuck, Thank you very much. That's cleared it all up. I shall have a go at that and let you know how I get on. Thank you, all, for your replies. Clem.
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    Starter Dog

    Thank you very much for your replies, gents. I think I must be having brain failure (too much sitting around eating turkey over Christmas) because I can't picture how to actually set up the piece and the cutter on the mill to get the form shown in Jim's picture. Is it a two step process? Do I...
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    Starter Dog

    Hello All, I'm a newbie to model engine making so please forgive me if my questions seem silly. I'm currently making an Upshur vertical single engine but received a little two-stroke engine from my brother for Christmas. I'd like to make a starter dog for this and, when it is finished, my...
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