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Chuck:I am interested in the logic behind many of your choices when building these types of engines that come out of your workshop. For example: Did you design the head and then look for a spark-plug to fit, or, did you know that this was your choice of plug and then make the head to fit the plug? You note in your article, that the "RIMFIRE" plugs are expensive. Why did you choose this style plug, and, were there other choices?Do you always make your own rings, or, do you buy available rings made for model pistons, and then design the cylinder/piston based on what's available commercially?You and others on this forum who can whip up these engines in your sleep, amaze me. You pull parts together, make what's needed, and a month later, you have a running engine. I understand all engines have parts in common, but you guys are Wizzards when it comes to finding solutions to design problems, using what's on hand, and then work with tools that you have.My hat's off to guys like you....the Masters of Clever Invention. You inspire guys like me.Frank
"I made the timing gears..." On the 3D printer? Nice gears.Hugh.
Nice 1 chuck, that printed engine looks good, bet it took some development to get it like that or was done on a good printer. is it one of elmers engines?