Definitely have to design (not build, design) an engine to rev super high. I remember when the YZF400s first came out and the 2 stroke versus 4 stroke debates really started. The early YZFs were 12:1 compression and rev'd past 11,000 rpms. A single 4 stroke engine that rev'd that high was pretty insane, but when you see a piston out of one there's literally no skirt on it. They were considered to be heavy at first, but there's no debating all that RPM made up for the "extra strokes" versus the old premixers. High rev's only make sense if they make power up there, and I would agree that diesel's are a bad place for a high redline.
