I'm sure you remember diesel model airplane motors. They were strong runners but a little temperamental when it came to cold starts. My dad and I had a couple of them and he used to warm them with his cigarette lighter on cold days before flipping the prop. It would be an interesting project not to mention the smell from the exhaust. There has been some discussion here but to my knowledge no one has done a successful conversion. Keep us informed if you try it.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"