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peterl95124, Thanks for the info. I understand the pitfalls of lapping into a blind hole, I have built engines before that run well and I did not lap them, This engine I thought to go an extra mile so to speak. I am finding a .002 to .003 taper in the cylinders, larger at the head (blind) end...

So... I am trying to lap a few cylinders. They are 1.5" diameter 303 stainless steel. I have read up on this some so I gave it a try. I made a lap out of aluminum about .002 smaller that the bore with a couple of grooves in it to help hold the compound. I used Time saver lapping compound. These...

Yes! your right! I did not see that, I didn't think that through quit far enough.

I agree with what you have said. I was speaking "conceptually" and staying out of all the fiddly bit of a design. I think, since we are talking about a model (?) the fiddly bits are mostly academic. The model suggested would run I think and make an interesting display.

OK , I have been digesting this a bit and her is my two cents. This is off the top of my head so it my not be exact but.... The difference between the two designs is the Torque produced between the two cylinders and the force produced between the two cylinders. In a typical design 1" stroke HP...

This is my first post to this forum. After a few years of learning this for you experts I decided to jump in with both feet. I have always wanted to build a FLourCity tractor engine so after building a few casting kits and gaining some experience. I started measuring one up that a friend owned...