porsche rollbar bolt in -no joke
Registered User
Joined: Nov 2003
Posts: 401
From: Miami...
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Originally posted by werksracer
Erik,
you guys don't ever weld those rollbars in?
I know in the 914s, that the bolted-in rollbars are damn near just added weight, whereas the welded-in units also really strengthen up the chassis.
just curious....
Scott
Modesto Ca
Erik,
you guys don't ever weld those rollbars in?
I know in the 914s, that the bolted-in rollbars are damn near just added weight, whereas the welded-in units also really strengthen up the chassis.
just curious....
Scott
Modesto Ca
Also the rear down pipes should terminate at the upper shock mount or very close to in order in increase rigidity, not to the seat belt buckle mount!!!
For our customers who want more than a bolt in harness bar if you will, we work closely with a custom fabricator who specializes in custom chromoly roll bars and roll cages....welded in of course!
Erik
Registered User
Joined: Nov 2003
Posts: 401
From: Miami...
Rep Power: 39
Originally posted by KPV
Erik,
As you know I have one of these "wedge in place, squeeze, pull, push, torque, porta-power, sweat, cry, bleed and curse" rolbars in my car. To address your load concern......
Assuming the bolts used are in fact 1/2" diameter and they have a yield strength of 36,000 psi.....
Definitions are in order......
In structural engineering.........
Allowable load is a safe percentage of the yielding load.
Yielding load is the load that permanently deforms the bolt.
Ultimate load is the load the breaks the part into two pieces.
And remember, there are four of these bolts.
Erik,
As you know I have one of these "wedge in place, squeeze, pull, push, torque, porta-power, sweat, cry, bleed and curse" rolbars in my car. To address your load concern......
Assuming the bolts used are in fact 1/2" diameter and they have a yield strength of 36,000 psi.....
- The allowable load, in shear, on each bolt is 2,830 pounds.
- The yielding load, in shear, on each bolt is 7,070 pounds.
- The ultimate load, in shear, on each bolt is approximately 11,390 pounds.
Definitions are in order......
In structural engineering.........
Allowable load is a safe percentage of the yielding load.
Yielding load is the load that permanently deforms the bolt.
Ultimate load is the load the breaks the part into two pieces.
And remember, there are four of these bolts.
Stop trying to confuse everyone with you technical mumbo jumbo!!!
Everyone knows your making all that up any way!!
One more thing....
Merry Chrismas
Erik
Registered User
Joined: Sep 2003
Posts: 6,351
From: New York
Rep Power: 298
Originally posted by KPV
Definitions are in order......
In structural engineering.........
Allowable load is a safe percentage of the yielding load.
- The allowable load, in shear, on each bolt is 2,830 pounds.
Definitions are in order......
In structural engineering.........
Allowable load is a safe percentage of the yielding load.
Ohh yeah, I have certainly heard of welded mounts failing too!!!
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