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What is your authority on rigidity? (archive)
[ Follow Ups ] [ 3-series (E46) Message Board ] [ Msg. Board FAQ ]
Posted by John on January 15, 2001 at 10:56:29:

In Reply to: I'd think moonroof was more like 30-40. No roof posted by also increases rigidity. Rex nt on January 14, 2001 at 23:20:58:

From a structural engineer's point of view (not automotive) I can see no reason chassis rigidity would be affected either way. If there were any flexing in the area of the moonroof, you would hear creaking in the area between the roof gasket and the glass panel.

The 3-series is one of the most rigid stock automobiles available (perhaps THE most). Chassis rigidity shouldn't be a consideration in whether or not to opt for the moonroof, IMHO.

I'd guess the moonroof delete would save you about 15-20 lbs. Each seat, probably another 15 lbs.

I'd estimate total weight savings would be around 50 lbs. That is significant!





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