850 Motor Mount Question

[johnt]

Does anyone know why the 850 spider has a different motor mount than the coupe and sedan. :help: :confuse2:

See this link for more discussion on it.
http://retrorides.proboards.com/post/2045492/thread

Thanks in advance to those who reply with the best answer

 

[Fiatpwr]

I think it has to do with the mount itself. The Coupe/sedan mount has a spring crammed in with the rubber donuts. The spring makes the unit 'wobble' more. The brace may be an attempt to eliminate that.
The spider/sport arrangement looses the spring, uses a larger casting and a bigger donut.

Just my guess.

 

[kmead]

That is correct.

The spring adds a notable amount of compliance which the torque arm minimizes to some degree. It allows vertical compliance with little side to side motion

I think the real difference I have seen is that a spider rear panel is much more likely to have the mount torn and with stress cracks around the mount.