I usually take out electric motors and gear assm. from elec. windows,
windshield wipers, blowers, etc.. Some of them are surprisingly
powerful. I'm currently building a 7.5 inch gauge train for my grandson
and will power it with some of those motors I have laying around.

I once saw a good sized Hunter that the owner air conditioned with the
AC off a Volkswagen. He mounted the compressor on the inside of the
engine box and drove it with a belt from the aux diesel. A lever on the
mount engaged the compressor. Should work. with some adjustment, for
refrigeration as well.

My cousin build a log splitter powered by a power steering pump and the
hydraulic ram. (power boom vang?)

Ron