RE: 3W.85 vibrating too much
hey Dale Pabajo! You`re right, I don`t need the stand-offs. The engine and plate are installed directly on the firewall. Still the engines sticks out of the cowl about 3/4 inches. I had a ZDZ80RV installed on the plane before, ut I didn`t fly it with the ZDZ. The ZDZ needed 1/2 inch standoffs to get it out of the cowl.
From what I`ve heard, if your engine vibrates and you put standoffs on it, it will vibrate more. The best way of doing it is supposed to be directly to a solid firewall.
John