A direct comparison between an O-200 and 912S is however very relevant. O-200 usually about 21 lt/hr - generating less than 75 hp (which is at somewhere between 2350 and 2500 depending on which souce you use). 912S 15 to 16 lt/hr generating around 75 hp potentially a little more. Installed weights between 100 and 110 lbs lighter.
No a modern 180h engine would not look like a Lycon, it would almost certainly be geared and at least partially water cooled - very much like a 912....