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Tim the axial-uni flow expression depends of who's work you read last.

Using someone elses cylinder block precluded the use of 360 degree ports & I wanted to get any heat away from the lower...

Thanks for that Jeff, but I was rather hoping one of the techies would have torn it apart techniically if there were major flaws in my logic.

A couple of years ago I gave a lot of thought to building a 3 cylinder axial flow turbo 2 stroke, the idea was to use a commercial 2 stroke block with replacable liners, the head was to have 2...

It might be worth checking what the silicon content was in the origonal pistons, JP only seem to do 10%.
If I remember right high performance pistons have a much higher Si content to limit expansion.