[Steve PH]

From what I've heard (and I admit this is second hand info from other people) if you solid mount an engine you can run into some interesting problems.

As well as a lot of additional vibraton and noise in the cockpit, the vibration through the engine and every thing attached to it can actualy start to undo bolts and nuts even head bolts! To counteract this virtualy every fixing, nut and bolt will need loctite-ing as well as being correctly torqued to start with.