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:but I'm pretty sure that like all tubular manifolds, its not will they eventually crack....its when they will crack. the cracking can be controlled.
the cracking is based on the weight of the turbos hanging off the manifolds.
add to that, the heat that the welds are dealing with (heat weakens welds... the strength returns when cooled again). This cycling is not inherently bad. Greg Dupree designed for this by choosing a more expensive material (tubing/welds) that can withstand vast temperature cycles.
Also, the weight of the exhaust is now playing a factor, as there are no exhaust hangers from the rear axle forward. That's some serious weight.
I'm pretty sure Mr Dupree gussets all his manifolds to over come this. he also offers flexible test pipes that allows the engine to move seperate of the exhaust/chassis, freeing up unnecessary stress on the manifolds.
I know companies like SGP gusset all their tubular greddy manifolds they sell (as an option, if the customer so chooses). Lots of options out there... it's just a matter of cost of entry versus performance, and the end user taking the necesssary precatuins to prevent cracking.
Petz #3
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23:44:34 07/10/05
