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914World.com _ 914World Garage _ Rear trailing arm geometry
Posted by: r_towle Feb 25 2014, 07:49 PM
So,
I am working on a project to install early 911 trailing arms into a 356.
Instead of a full tube going from side to side, I need to built two shorter tubes to allow the larger transmission to fit properly.
The question is this.
Assume the tube is perfectly square within the chassis.
Would the mounting face of the wheel at the hub be perfectly square to the chassis with zero toe in our out?
Looking for a method to lay out the brackets to get it setup properly prior to welding.
Posted by: Jeff Hail Feb 25 2014, 10:47 PM
So,
I am working on a project to install early 911 trailing arms into a 356.
Instead of a full tube going from side to side, I need to built two shorter tubes to allow the larger transmission to fit properly.
The question is this.
Assume the tube is perfectly square within the chassis. Yes
Would the mounting face of the wheel at the hub be perfectly square to the chassis with zero toe in our out? [/color]Yes and No (Depends)
[color=#FF0000] on how the suspension is setup? I usually have access to a 911 with its skirt up and panties off but not this week . You will need to know the height of the trailing arms pivots from a datum line. You will also need the height of center of the hubs to the same datum line to get a static base line as if sitting on the ground. What about spring plates?
Looking for a method to lay out the brackets to get it setup properly prior to welding.
If you can find a salvage yard with the suspension and drivetrain out the bracket layout would not be hard to measure out. Personally I would build the pivot mount box out of the car and then make adjustments as you go. The other option would be to find a wrecked 911 or one already cut in half and use it as a jig or remove the section you need and graft it to the pan.
Posted by: r_towle Feb 27 2014, 05:58 PM
If I could find a rear 911 or 912 tube, then it would buy it...trailing arms and all.
But I don't want a whole car....
I have called some of the places but more of the tubs are getting restored now....
Posted by: Durus Feb 27 2014, 06:02 PM
Too much barn...not enough time.
Posted by: Durus Feb 27 2014, 08:53 PM
Use an old technique from the carpenters...an "angle finder"....the only problem is, your going to need to find the early 911 trailing arm layout...really easy...find someone that ownes one...explain what you're up to...take your angle finder...measure and lock and your done.
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