Choochoomike, the bolts I used are 5/8" diameter bolts, but I will have to get you the length tomorrow. The flywheel on my example is a nut that was cut in half and faced. The threads were machined out and an aluminum disk was press fit inside the fly"nut". The crankshaft was also a press fit on my unit. The crank shaft is made from 1/4" drill rod. The piston was made out of brass and the diameter is .475 IIRC, the connecting rod out of 8x32 all thread, and the crank pin is a tap (6x32) that was cut to length and pressed into the crank disk. The connecting rod end "crank side" just floats on the crank pin. As far as placement of the ports, pivot, and crank shaft, I played with the items I had on hand until I had a happy medium with the dimensions.
No drawings for my example, but Kactiguy may have some drawn up. If not, I can whip you up a set fairly easily if you wish.
My engine is not balanced very well. In fact, not at all. It runs great, but as RPMs increase, it gets to vibrating a lot. This one I didn't build for balance, but just as a conversation piece. When I get a few more things caught up, i am going to finish the base for it and get a video put up here.
No drawings for my example, but Kactiguy may have some drawn up. If not, I can whip you up a set fairly easily if you wish.
My engine is not balanced very well. In fact, not at all. It runs great, but as RPMs increase, it gets to vibrating a lot. This one I didn't build for balance, but just as a conversation piece. When I get a few more things caught up, i am going to finish the base for it and get a video put up here.
