both M&W pistons the AP-46 and AP-49 for the Allis have the same piston casting, they just vary the wrist pin height depending on the WC-WD or the WD-45 and D-17 piston. You can see the flashing in the casting for the other pin height on some of them.
I've measured the bowl volume to be right close to 70cc. They are thick enough and can be trimmed out more should you want to vary things some.
I don't know what the power crater piston volume is.
Stock rods will take quite a bit of compression, it's going to depend on when and how hard you light the cylinder, keeping good gas in and late timeing they will take a lot at least a 12 to 1 ratio and there's many of them running much higher. Though poor gas and advanced timeing would destroy them at 9 to 1 compression. It also depends on the rod angle, if you have a stroked crank and the shorter rod, they just bend easier when put at more of an angle. Simple physics.
Edited by wi50 - 05 Jun 2013 at 1:40pm
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