On Mar 10, 12:37*pm, Tim Wescott wrote:
...
Trash a cylinder on a monoblock engine and you have to do a complete
rebuild. *Trash one cylinder on an assembled engine and you just have to
replace one part.....
Tim Wescott

Like this:
http://picasaweb.google.com/KB1DAL/T...74948163130882
That's the right inboard engine of the B-17 "909", at an airshow in
Nashua NH. The cylinder cracked and they had to fix it to get home.

I happened to be standing under the wing when they set up the ladder
and made myself useful by taking the cowling pieces as they handed
them down, so by the time security roped off the area I looked like I
belonged there. Eventually the rest of the crew wandered off, leaving
just me assisting the crew chief to disassemble the head and fasten it
onto the good cylinder, then turn the prop while he set the valves. My
hands were too dirty to hold the camera most of the time.

Some day I'm going to make a model radial engine. First I might do a
pocket-sized one with valves timed to compress or run on air.

jsw