Sorry, I don't know the idle HP. I've never done this, but I've seen people who have, so I know its do-able.
I've seen a few Isuzus around, but VW and Mercedes seem to be the most common 4-cyl's, here's a more complete list:
http://www.grassolean.com/index.html?textFile=dieselcars
If you're only idling, turbo-diesel's will run without the turbo, and if you get a "near-free" engine thats too big, a 4-cylinder can be run on two cylinders. I've just been collecting information for my retirement, so I haven't done this myself, but I have seen it done.
IMHO, a properly cared for Lister should last for decades, and is well worth the cost.
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