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Most don't "cut" the ring at all. Most simply snap it and file ends to required gap which, on air cooled is around 2 thou per inch of bore size. So fit the ring in the finished bore using piston to get it square, measure gap and refile as necessary.

As #180, have added the EDA files here for anyone interested. Also the final schematics for Hall Effect KY-003 module operation. Have also included a version schematics for operation with everyday points if anyone so desires. Note there is no requirement for the "points condensor" as in...

George Punter from Australia built a miniature Lister Diesel engine a couple of years back. Video here........

There is simply no tolerance in miniature engines for poor workmanship. There would be a perfectly simple explanation if one could actually have one of these non-running engines in hand but all one can do is rely on vague explanations and assurances that everything is done correctly. I'd like 2...

Many ringed engines will have near zero compression (initially) when wound over by hand. See how it responds with the same arrangement only with a drop of oil in the bore and spun with a drill at a hundred revs or so.

That sounds like a valve problem to me......as most are in fact.

Yes, it's not all glory glory when it comes to battery power. One rarely hears the downside or in fact, the dust to dust effect of all the lithium waste that will appear in time to come. We do get a good run out of 4 and 5Ah Dewalt originals in out power tools except for the vacuum cleaner. It...

Link to a site which allows calculation of dimensions for spring mandrels...... Cheers Jorgo CGTK - Dr Al's Miscellany

I built my own for the four cylinder using an ATtiny85 module and mosfet.

Point being the point open during a 10 degree or less period. Do the maths.

Point being, it's a mechanical leafspring that bends to open and bends to close. How long would that last on an engine, before even considering the opening and closing times required. As pointed out the best that reed could handle is 3 milliseconds, hardly cover the idle let alone anything else.

:):)

Might look like the same housing but I doubt very much it would be a reed switch. Specs say best operating time (apart from life span) is around 3 milliseconds. Reed switches would never stand up to the demand of an engine ignition system. They're made for such things as door and window sensors...

I doubt that......

My mate came from Qld but used to live in SA and was called Spider down there because of his hairy legs I think. He has a workshop as big as yours and a lathe exactly the same........ can't see it either for all the collection of sh***t. :p

No, it was stainless steel. 1/2" diameter 303 stainless AND he used Tap Magic for stainless cutting oil.

Saw a video from Joe Pieczynski about turning ultra small diameters in one bite and thought useful for turning valve stems. Current approach is to whittle down to size with small amounts of overhang in a series of "moves", extending the raw material perhaps 3mm each time. Takes a long time per...

It is using just the coil so life expectancy of a relay doesn't come into it

For some of us, that is more than enough.

Think there may be a set of exploded view/sectioned drawings in this book......... https://www.teepublishing.co.uk/books/for-the-aeromodeller-engine-builder/model-petrol-engines/ Model Petrol Engines By Edgar T. Westbury : Free Download, Borrow, and Streaming : Internet Archive