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Max Sluiter
 
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Chassis Sheet Metal Thickness

Also posted here: Chassis Sheet Metal Thickness

I was wondering if the dashboard steel is the same gage as the steel sheet metal used for the chassis panels. Does anyone have the specs for chassis and bodywork sheet metal?

What brought the question on was wondering how much stiffness a dash bar would add to my car if I added one to my cage. Probably not much since my cage is not tied in to the suspension pivots/mounts so the cage would be stiffer but not the car as a whole.

Thanks for any help.

911S Snake afternoon Fahren 022

Car is a 1971 911S
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911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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Old 02-21-2011, 11:11 AM
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Max Sluiter
 
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Bump for an answer
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911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
http://www.flickr.com/photos/max_911_fahrer/
Old 03-02-2011, 09:06 AM
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According to a discussion with Mark at Eurotek (NLA) a few years ago:

"Prior to 74, chassis metal is .032", thereafter, .035" (20 gauge)
RSR used two layers of .070" on the sill plate.
On the longitudinal pieces, .035" before '85
After '85 (C2 and C4), went to .080" thickness"


I think your chassis is more rigid with the full cage. It looks to be attached to the chassis. Adding a "dash bar" should add rigidity, but watch out. Keep that sub-belt attached to prevent knee-to-tube collision contact.

MHO,
Sherwood
Old 03-02-2011, 09:36 AM
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Max Sluiter
 
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Thanks, so the dash should be included in the 0.032" sheet metal of the chassis, like the roof.

A dash bar is a ways off, and I think the dash is stout enough now that a steel tube would just be adding weight. If I had a carbon or fiberglass dash, it would be a different story.

The extra rigidity of the dash bar with the steel dash would be wasted since the cage is still tied in to the chassis at the same points, none of which are the suspension pickups.
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911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
http://www.flickr.com/photos/max_911_fahrer/
Old 03-02-2011, 01:01 PM
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Max Sluiter
 
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Most benefitial would be diagonal bracing for torsional rigidity like a space frame. Tying the rear spring plate area into the front strut towers and A-arm mount area. The bar would need to be an X in the back of the car, arcing on the inside of the roof, down to the base of the A pillar with a bar also going through the front bulkhead to the front suspension pickups.
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911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
http://www.flickr.com/photos/max_911_fahrer/
Old 03-02-2011, 01:05 PM
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Best bang for your buck? Forget about the bar, take the $ and invest in some DE/track/ax days. The car is stiff enough. Where you presently drive your 911, you'd never notice the difference anyway.
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Old 03-02-2011, 03:03 PM
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Max Sluiter
 
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I did not mean best for lap time, I meant best way to add stiffness.

You must remember I am a Mechanical Engineering student. I like that sort of thing.
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911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
http://www.flickr.com/photos/max_911_fahrer/
Old 03-02-2011, 03:19 PM
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Old 03-02-2011, 03:19 PM
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