What Non-Automotive Engine Would You Swap Into Your Vehicle?

Engine swaps aren't as cool as they were even a decade ago. That's not to say they're dumb, but I think you'll agree that some are played out at this point. In a sea of LS and K-series swaps, few jobbies get me excited. I think the most surefire way to build an interesting car these days is to look outside the automotive sector.

That's why I'm asking: What non-car engine would you put in your vehicle?

This question came to mind while thinking about that Kubota diesel-powered Honda Insight we featured yesterday. It's slow, sure, but I'll be darned if it isn't sick. And it has a supercharger? Come on.