My question is about where to position the engine on the motor mount in relation to distance from the firewall and the front of the motor mount. Does it make any difference, other than with the balancing of the model? I ask, because I have a motor mount for an OS .60 size engine and miss drilled the holes on one side of the motor mount. What effect, again aside from balance would I get if I relocated the engine, forward or backwards on the same motor mount and drilled four new holes? How will this effect the strength and vibration qualities of the mount, etc? Also, a friend gave me an old plane of his and I found that the motor mount bolts were smaller than the motor mount bolt holes in the engine being used, but fit the holes perfectly that were drilled into the motor mount. It didn't appear to effect the engine performance, as he has been flying this plane with the same set up for a couple of years, now. I would feel better if I replaced the bolts with bolts that fit the engine mount holes and redrilled the motor mount holes, even though the engine didn't have any problems with this set up before. What do you think?
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