ORIGINAL: Mikel-t
Seeing how some kits supply an engine mount or recommend a system, what are the good and bad features of : single mounts, two-piece mounts, mounts with grommets, 2-stroke different from 4stroke? I am about to add an engine to my 4*60 and want to go to a reliable running engine and mounting system. I have built the kit stock as this is my first low-wing plane. Any help here is appreciated. Mikel-T
Well, I can answer some of these. Four-Stroke engines with the carburetor behind the engine require a mount with longer legs. Thus, the 4-stroke's prop washer sticks out further from the firewall.
Two piece mounts are okay, and usually absorb a little vibration. As such, they tend to work loose, so loctite the screws. Some of them have grommets, but I've never seen a one piece mount with grommets. Again, they're a vibration absorbing feature. Keep in mind, either the firewall absorbs the vibration, or the mount.
Your 4-Star is a sturdy item. You can use a two stroke engine with a two stroke mount, and be fine. No cowl nose to align with. The firewall will be just fine, it can take the vibration. On the other hand, if you wish to go with a 60 fourstroke, it will be just fine, too. I don't usually spend the extra money for the rubber grommet mounts, but with a fourstroke you'd need the longer rails of a fourstroke mount.
You can probably fly the 4-Star 60 with a .46, or a .61 twostroke, or a .52 twostroke, up to maybe a .70 fourstroke. You'll like the plane.
Good luck,
Dave Olson