How much stiffer with solid or tied in roof? |
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How much stiffer with solid or tied in roof? |
Mueller |
Dec 12 2004, 11:17 AM
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#1
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
New car has no cage, I know the 914 tends to flex and that the factory welded steel roofs on the 916 for what I guess was to help stiffen them, or was it for other reasons??
The 'glass top should help a little, but I was wondering about attaching tubes or the like from the factory roll bar to the windshield hoop to stiffen the car up.... Has anyone played with this before?? |
Eric_Shea |
Dec 14 2004, 03:47 PM
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#2
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PMB Performance Group: Admin Posts: 19,279 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
QUOTE I know engineers that couldn't find their way out of a brown paper sack, but they could tell you torsional stiffness of that paper sack, in theory. Obviously there are exceptions to the rule. Hmmmmmmm... me understands (IMG:style_emoticons/default/agree.gif) but (there's that "but" word), I would think that a Porsche Engineer assigned to the factory race team might be the "exception" to your paper sack rule. They engineered them to 1st place in GT class at LeMans after all. I'll be trusting them until I get some cold hard facts to the contrary (a "fix for a windshield being cut off" would not be that. Sorry John (IMG:style_emoticons/default/wub.gif) ). Especially when I've had first hand experience with so many cracked windshield posts. It sounds like we're on the same page with this. We did some pretty solid research on the Frame Rails and the Factory Stiffening Kits and I feel there's enough evidence there to contradict a lot of the "here say" going on here. We had a Boeing engineer come look at a bare -6 tub and describe what he would do to stiffen the chassis. Without even seeing one, he literally drew a factory kit on the tub. He looked at the frame rails (longitudinals), rear shock towers and the tranny mounts and came to his conclusion. He also mentioned stiffening needed for the rear suspension console. It was pretty eerie watching him lay it out. All in all, there's a lot that 30 plus years can teach us about the strength and longevity of our tubs. They were an engineering marvel for there day. I'm sure there's some things we can understand and see now that they didn't have the time or wherewithal to address back then. A lot of times they simply engineered them to last 24 hours. The 914 was a very short-lived project for the racing team. (IMG:style_emoticons/default/sad.gif) On John's behalf, the fact that his cage was tied to the frame and probably the rest of the car through the longitudinals would very much answer the question as to why his windshield posts never cracked in 16 years. I would doubt there would be any flex in the frame with it tied in so well. So... "Good-ole-Boys", I'm all ears (really I am). If there's some better way, let it be heard. (IMG:style_emoticons/default/smilie_pokal.gif) |
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