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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#21
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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?? |
Brett W |
Dec 14 2004, 12:16 PM
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#22
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Advanced Member Group: Members Posts: 2,856 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None |
The problem with the 914 chassis is there are way to many disconnected and incomplete box sections. Look at the front trunk area and fuel tank area. Uncapped boxes, disconnected structures. Look at some of the newer chassis and you can see how things are much different. Look at the Carrera GT. I realize that is a carbon monoque but look at how the box is built. Look at some of the Audi Unibody chassis. Very stiff. Look at the new Ford GT.
Many people are working on a way to configure the doors to be part of the intergral chassis structure. Unfortnately, keeping the unit light wieght and durable has become a very large problem. In theory you could design some sort of door with multiple pins and moving spacer blocks that would put pressure on the chassis at the same points that the cross bolts go into, but that would be a major engineering and manufacturing hurdle. Just imagine what happens when the system fails and grandma is trapped in here Cadillac. Car manufactures would go out of business from lawsuits. Check out the new issue of Grassroots. They have a fairly lame article on Chassis stiffness based on their 914 project car. Good Ol boys can know more than Engineers. Just because you are an engineer doesn't make you God's gift to design and production. 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. It all depends on the situation. I agree most don't know more though. |
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