The biggest difference between a 40 and a 46 engine is a toss-up. Could be the snob appeal being able to say 46, or it could be just the price
IMHO an OS .40LA cannot compare to an OS.46 FX when it comes to power. With the OS .40 I flew a trainer mostly at full throttle, with the OS .46 I flew the same trainer mostly at 1/4 throttle. GL
RCF esq.