I tried a large set of Lord mounts on a Q42 / Byron Pitts

A set of B & B soft mounts on a Brison 2.4 / Midwest 300S

A Great Planes Iso Mount on the Brison 2.4 / P - 51

I really don't know if they gave me problems or not but my cowls & canopies were always cracking and you could feel & hear the vibration in the airframe. This summer I put the 2.4 in a Balsa Nova 120 and a TS52 in a 27% Ultimate both hard mounted. Neither one of these planes gave any vibration problems. Maybe it was the different airframes I don't know. I am in the process of removing the soft mount from the P - 51 and install the 2.4 back in hard mounted. This maybe a better test.

I have soft mounted my glow engines for years ( Du Bro & Hyde mounts ) and am very pleased with those results but was never convinced that it was a good idea with a gasser. Maybe I'm wrong, I have been once or twice before.