Personally, I just love engines. I usually buy them to try them. I did tell the wife to get me another OS .55AX for Christmas.

I was just speculating on the JBA. If you calculate the displacement, it comes to just under .58. This is in a .40-.46 size case. Some time, if you punch the displacement out too much, you don't have enough room for the porting. I would hope the JBA would be like the old small case Super Tigre 60.

The OS .55 is not in the same case as the .46AX. It looks slightly larger, but only weighs a little over 1 ounce more. It appears to be designed from scratch for the .55 displacement.

Remember, nearly all of the .46s are bored out .40s with a larger bore and the same stroke/crankshaft. I remember some discussion several years back on the Just Engines .56. As I recall, they were trying for the largest displacement in a .46 size case. There were mixed reviews on it. Since it was the first of that size, it might be growing pains of the first production run. I'll probably get a JBA .56 down the road and hang it on a Stick to see how it runs.