[RichardW]

Whatever happened to the Stirling Engine?

[John Jamieson]

Really big a heavy for any serious Hp. They make pretty good stationary engines.

[techcor]

I think I can answer that one. They don't produce enough power (in the space and weight requirements). Also, because they are an external heat engine , they have been traditionally slow to start (have to warm up). If you're interested int Stirling engines, do a search on google for "Thermal accoustic engines". I call them genie bottles and they will be important to the future. Just not for transportation.