[DML] torsion bar questions

["Cameron, Peter" <cameron@xxxxxxx>]

every time the subject of the torsion bar turns up on this group it wants to worry me.
 
the door is a sophisticated piece of engineering. to have access to the relevant engineering data and put together the design effort that would permit understanding of the existing design is no small effort. 
 
so i have two questions:
 
the people that are selling these potentially dangerous replacement bars, they have done some sort of finite element modeling of the structure, yes? or at least the basic analytical calculations? they would be willing to share these with us? the analysis comprises more than just the bar, yes?
 
the original bars were annealed in liquid nitrogen. anyone know why? surely Grumman (the subcontractor on some portion of the door - smart move here by DeLorean) had a good reason for doing this. what improvements in metallurgy in the past 30 years permits one to omit the anneal?
 
 

________________________________

From:Daniel Plakosh
Subject: Re: [DML] Re: Driver Side Torsion Unit



Dave.

I agree turning the bar up higher (tighter) to overcome a weak strut is bad and that struts are cheap, torsion bars and hinges are not. I also agree that if struts date-stamped sometime in the mid-80s and door actually works, that the bar is probably turned up too high to compensate for a weak strut. However, I'm not sure that all of this would be true with a bar that has a different/new design from the original.


Dan 


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