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02.04.2011, 10:03 PM
I too thought about using the RCM universal center diff motor mount, but the issue with it is how it mounts and the mounting bolt pattern. The MGT chassis has an opening on the bottom deck of the chassis below the trans. If the mount pattern has the bolts too close together, there either wont be able material to drill the holes through, or the holes would be right on the edges of that opening. The alternative is to make that opening a bit bigger with some machine work (or a dremel), and use a separate plate to bolt the mount to, then bolt that plate to the chassis, preferably with more bolts (I'd do no less than 6 personally).
Another issue is that lower deck is rather thin, and to have a mount bolted to that results in unwanted flexing, I've been there done that with the first 3 versions of my center diff motor mount (original pieced together one, and 2 versions of my steel one). While it was not enough flex to cause issues for the short time I used each design, I didn't really care for it. I was only using a Tekin truggy motor too, if you plan on using a 1717 it would probably fatigue and eventually crack the lower deck of the chassis.
If I remember correctly, the MGT chassis is made of 5052 aluminum, which by it's design is very strong and would be major overkill to be made of anything else, but 5052 has lower strength than 6061 and 7075 grades that are the norm in the high end RC industry (softer as per the Rockwell and Brinell hardness scales), and it wasn't designed to have anything mounted directly to that lower deck. TheDude's motor mount (the french guy) is mounted to the bottom deck but also has tabs that bolt to the top deck for extra support, and mine is mounted only to the top deck.
Just something to consider, and don't get me wrong here, I'm not saying the RCM universal center diff motor mount is a bad product, it's just not the ideal product for an MGT center diff conversion IMO.
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