Tim and son, I appreciate your interest in solenoid engines. As you have noted, my interest is intense; I've built over a dozen and continue to explore the possibilities ( see some of them on YouTube under "miniature solenoid engine" by Art Rafael. Since I could not find any viable plans when I started, I just experimented and made things up as I went along with each part built to accomodate the part before and to connect to subsequent parts. Some projects resulted in single cylinder engines, some in two cylinder up to four cylinder -verticle and boxer profiles. Of course I recommend starting with a simpler one cylinder variety. I have wound my own solenoids and have used some "off the shelf" (they can be found in surplus stores or in electronics recycle stores) , but these stores are sometimes hard to find. Alternately, solenoids can be found in car junk yards; they have been used to operate some devices such as power door locks, etc. Solenoids have also been used to drive the hammers that pound the chimes of doorbells and to operate lawn watering valves, etc. They are also used in electronic hard drives and other track changing devices. If you just can't scavenge any up locally search for them on Ebay; they list many types. Then you will need to build a flywheel or two - I have used large silves dollars (Eisenhowers), large washers, casino tokens, etc. Then build a crankshaft - I've used a nickel and drilled an off center hole for a peg to hook up a connecting rod to the solenoid plunger (piston). The tricky part is setting the timeing with some kind of switch and cam so that power is sent to the solenoid at the right time (typically bottom dead center) - kinda the opposite of a sparkplug engine which fires near top dead center. Well heck, sorry that I got so wordy. It really isn't that difficult to do. It's just difficult to explain with words. I'll try to sketch up something that will be more clear than 1000 words. Ralph