Is there any tricks to softening engine vibration like putting some sort of rubber or something in between the engine mount and the firewall?

Firstly, have you balanced your prop? Secondly, what sort of engine mount are you using?

What engine? What plane? What mount?

There are anti-vibration mounts available -- if you need one.

balance your prop....first horizontally...then...vertically balance the hub. when you are able to put your prop at any position and have it stay in that position then the prop is balanced.


if you are using a spinner... balance the spinner !