Now I know it sounds crazy but hear me out. HYPOTHETICALLY, as in if diamonds were cheap and easily machined, wouldn't diamond be good for an engine block? or at least a coating for the cylinders?
I mean diamond has a low coefficient of friction and a high thermal conductivity, its also pretty strong. How heavy is diamond anyway? What about alternatives?
Tear my theory apart please, I always think of stuff like this and theres always a hole in it somewhere, I just want to know where so I can casually move on to the next half baked idea.