The MVVS 1.60 is a much bigger engine than the FPE 1.3, RCS 140, or Roto 25. Here is my Roto 25 gasser (25cc, 1.50 ci):



It's about the same size as an OS 120 or Saito 120 with a lower cylinder head height and can swing a 16x8 prop at around 8500 rpm.