I haven't settled on a particular diesel yet, but I found the VM Motori 2.8L diesel is a pretty good match...small, decent power (especially around the RPMs it would prob get used at), and pretty efficient (BSFC at peak torqe is about 200g/kWh...according to their documentation). Also, it can be found in some American vehicles (like the Jeep Liberty) so finding one salvage may not be impossible. I looked at compact diesels from Kubota and Kohler and Yanmar among some others, but they all tended to be heavier, bulkier, lower power, and/or less efficient than the VM engine. Still looking, and still open to other ideas.
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