First off please accept a disclaimer that I may get some of my facts a little wrong because it's from a conversation I had some months ago after Dan first asked me if I knew anything about them over here. Even though the process was developed by Grumman, they were actually manufactured over here. I did not pursue the matter, but we DO have a contact with one of the guys who originally made the bars, and if memory serves, the bars were "simply" twisted through 11 complete revolutions at a particular temperature (it may have been liquit nitrogen, not helium, but I can't remember). I also know there are several unused pairs of bars "floating around" here, though it's not a commonly needed part, so we've never chased up on the supply. It's not like Windscreens! (which, you may be interested to learn, I've found a source of at £250 each, both Green and Bronze still avalable) Best Wishes Martin #1458 DOC UK www.delorean.co.uk tmpintnl wrote: > In regards to the torsion bars, these will be very difficult to > re-create. If I understand the technology and history correctly, > Grumman Aerospace made these in a fashion similar to the F-16 canopy > torsion springs. Because of the enormous stresses on our bars > (nearly a 90 degree twist in a part only a couple of feet long) the > bars were cryogenically tempered in liquid helium at about 7 degrees > Kelvin. That's very cold, by the way. This is much different than > the typical spring tempering at high temperatures, with a quench in > oil or air. Bottom line - I don't think that the local spring house > is going to want to attempt these. What to do? I don't know at this > point. Does anybody on the list have a different perspective on my > understanding? I would almost think that a call to Northrop-Grumman > might at least be interesting. Perhaps I can dredge up a contact. > > Toby Peterson VIN 2248 > Winged1