Michael wrote:

Note that NONE of the new aviation engines (Orenda, Thielert, Honda,
Bombadier) have separate cylinders.

Just a quick look with Yahoo turned up the Morane Renault, Zoche, and Jabiru engines
- all new designs with separate cylinders. I'd bet the guys going to Oshkosh will be
able to provide other examples when they get back.

In general, separate cylinders are advantageous for air-cooled engines and blocks are
preferred for water-cooled designs, but this is not a universal rule.

George Patterson
In Idaho, tossing a rattlesnake into a crowded room is felony assault.
In Tennessee, it's evangelism.