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I have made several 2 stroke diesel model aero engines, which are amongst the most critical for cylinder bore finish. I fine bore to get as good a finish as I can, feeding by hand. Boring a deep hole usually means that there is a very slight taper along it, the bottom end is slightly larger...

One way to help starting with a slightly poor piston fit is to inject a drop of thin oil into the exhaust port, which helps the seal. It will not work miracles, but helps in marginal cases. I have kept diesel fuel for several years in metal cans a nd found it still works ok. Do not give...

I do not look very often at this website, have only just read this thread. People worry too much about things like the accuracy of marking out screw holes, Just a rule and felt tip pen for marking fluid and a scriber is ok provided you always do the one part first and spot drill through to the...

Good luck with it, any small engine demands precision fits and low friction to run at all, this is why DC abandoned the Bambi as it was too expensive to make consistently well, I guess Cox had very sophisticated machine tools so could overcome the difficulty of achieving tight tolerances. I...

You are making much better drawings than I do at the initial stages. How will you ensure that the liner screws in so the gudgeon pin is well clear of the ports, or maybe it doesn t matter in your design. I like either to leave a very small shoulder between the crankpin and web, or to make the...

Just confirming that my 0.49 cubic inch (8cc) glow engine is running in a 3 part series in Model Engineer now, parts 1 and 2 have been issued and part 3 is due in February. The drawings appear in each part, the issues are 4549 and 4551, from Dec 2016 and Jan 2017, and the next will be 4553 as...

This is a verysimple own design two stroke made from bar stock alloy, which runs well and has been flown in a RC plane. Pans can be downloaded from www.modelenginenews.org, an excellent site run from Australia.

I have designed and built several 2 stroke model aero engines, and flown two of them, am now making a .49cu. inch glow.