-> > I have often considered using a V-8 automotive engine with much
 -> > altered cam and ignition timing running at 540 RPM (PTO speed) to run
 -> > a generator.  By careful selection of components, it would probably
 -> > be made to be quite efficient at that speed. Maybe even run it off
 -> > piped-in natural gas for co-generation.
 -> Craig, I doubt that this lashup would be "quite efficient" compared
 -> to an engine more closely sized to the load. There's lots of
 -> friction loss in such engines, and it would be quite significant
 -> at low RPM and load.
Prhaps one could look at a small tractor or marine diesel engine?  These 
engines are designed to run for extended periods at low speeds.
If you can't get small enough, you might see if any of your neighbors might 
want to contribute in exchange for a feed from a larger generator.
Kevin
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