MR you about nailed it; there is not much triangulation to counter the torque on the stock 914-6 factory mount set-up. As these mounts age I've noticed they definitely allow even more movement since the rubber is now 40+ years old in many cases.
The last NOS mount I had was appreciably stiffer than any older used ones by comparison, so I'm guessing most of the original mounts in service really should be changed to optimize an already marginal design.
Interesting to note the factory did stiffen the firewall plate on the GT and 916 with additional metal to better spread the torque load and triangulate the forces a bit more. I suspect they also knew the design was not optimal for bigger HP.
In reality the aftermarket designs that spread the load out further to the sides are likely better but do take up much more space and add more weight.
The factory design is definitely "clean" and takes up very little space in a pretty crowded engine compartment.
QUOTE(mountainroads @ Jan 29 2016, 12:43 PM)
This engine mount has always baffled me, so I'll ask a possibly dumb question: The 6-cylinder engine is attached to a vertical plate that essentially spans the width of the engine bay at the fan end when mounted in a 911. But, when turned around and installed in a 914, it's instead mounted at a single central point? I realize the transaxle supports provide some torque resistance, but why what appears to be so much less support for the engine when used in the fourteener? Am I missing something? Thanks guys.
- MR