> It's more a matter of vibration.  I had a diesel Rabbit engine a few
 > years ago from a totalled car and was considering it for stationary
 > use.  Didn't seem the right one for it.  I want to get some fairly
 > large engine running very slowly.  Build the thing specifically for
 > the application.
The Diesel Rabbit engine would be very efficient, but it won't make a lot of 
difference if you want to use the waste heat in addition to the electricity, 
and heat your house with it. And natural gas is the thing to use for fuel if 
you have it available.
Good luck with your project.
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