KBracing done did it T6 91mm front mount...
08-18-2010, 09:32 PM
#23
I've always wondered just how much weight is hanging off of those 8 little exhaust manifold studs with a setup like this, and what are the limits of the studs. Not questioning the strength of the manifold, looks to be quite heavy duty. But at what point should you consider additional support for the weight of the complete assembly? 
I couldn't find metric specs, but 8mm is pretty much the same as 5/16 and the info I found for a grade 5, 5/16x24 bolt is a shear strength of 5750lbs and a tensile strength of 6440lbs. 
08-18-2010, 09:39 PM
#24
Formerly darynC-10/23/10
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my turbo weighs 19lbs exact. i have not weighed the manifold yet , as im not finished with it yet 
the only thing i am worried about with a large turbo and nothing to support it but the bolts. is gasket leakage. are you using copper spray on the mls gaskets?
the only thing i am worried about with a large turbo and nothing to support it but the bolts. is gasket leakage. are you using copper spray on the mls gaskets?
08-18-2010, 09:42 PM
#25
You gotta figure in the leverage of the turbo hanging off the manifold, to calculate if you're getting close to the tensile strength. I'm not smart enough to do the math, but I do understand the concept of leverage & torque multiplication.
Quik's answer of 40 lbs or more needs a support makes sense, and sounds reasonable. I wasn't questioning that, I asked how much the KB setup weighs. (not exact, just approximate)
08-18-2010, 09:54 PM
#28
5 year bitches!
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no support with my pig of a turbo. PT88s arent light either and i was using my orignal exhaust bolts
to AZ you got to take into account your DP helps support weight, your cold pipe helps support weight. [if designed right]
Kb's log and my 88 were around 75lbs between the two. my truck deffently noticed the weight on the front spring. however never had issues with any leverage issues. the sch 40 is stout item
now cheaper kits on the market use tube which isnt meant to support weight of large size turbos
to AZ you got to take into account your DP helps support weight, your cold pipe helps support weight. [if designed right]
Kb's log and my 88 were around 75lbs between the two. my truck deffently noticed the weight on the front spring. however never had issues with any leverage issues. the sch 40 is stout item
now cheaper kits on the market use tube which isnt meant to support weight of large size turbos
08-18-2010, 10:04 PM
#29
Never had any doubts about the strength of the manifold. Just the bolts at the head. And since everything up here is 4x4, a quick torsion bar adjustment would level everything back out.
Thanks for the info. Some day I may want to build a track truck, might involve a turbo, and I've always wondered about this.
Oh, and Kwik, it's AK, not AZ..... lol
Thanks for the info. Some day I may want to build a track truck, might involve a turbo, and I've always wondered about this.
Oh, and Kwik, it's AK, not AZ..... lol
