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Hi, my name is Claude Perron, im from Quebec, Canada, my first language is french, so sorry for my bad english. As a first engine, im doing the Edwards 5 cylinders. I have made some parts already. Happy to be here

I'm happy that i saw that thread, i was not aware that we can have different strokes vs angle. And sorry if i jumped in without introducing myself, i will do it in the right place.

If you look at my third pics, i traced every pistons srtoke. They are all within 0.002" from the master rod. I'll simulate what 0.002" mean in our ratio tomorrow.

0.175 = 7.25:1 On my drawings, it say 8.5:1 There is only 0.002" difference in strokes between cylinders, i dont think that will change CR that munch one from another.

Here is how i did it. In my cad soft (CatiaV5) i extracted surfaces of cyl, piston top and head dome. I generated a volume for tdc and bdc. You see the volume at bottom left, so i adjuated the lips of the sleeve to get exactly 8.5:1. I did it on the master rod. The other pic is the "trace"...

To have 8.5:1, the lips must be .150" Other cylinders are within 0.002" of strokes vs the main rod.