On Tue, 25 May 2004 00:40:15 GMT, "G.R. Patterson III"
wrote:

Actually, because of the higher compression ratios, the mechanicals are not simpler.

Well sort of. Some two stroke cycle diesels don't have overhead
valves. No diesel has a spark ignition system. This type of engine
could be considered mechanically more simple than a four stroke cycle
engine.

But the fuel pump is a lot more complex and higher pressure, and most
diesels have either a turbo supercharger or a mechanically driven
supercharger, or both.

See http://www.deltahawkengines.com/index.htm for an example of a
very cool V four two stroke diesel engine intended for the homebuilt
market initially, and perhaps eventual certification.

Corky Scott