sen2two wrote:
a.moore wrote:
I'd get 6061-T6, anneal it if needed (draw on it with a blue Sharpie and heat it until the blue disappears), and carry on bending it. Order a little extra - try the first bend without annealing and see how it goes. Plus you're at 3.7:1 for the ratio. That will help your cause.
Why are you going so thick for intake runners? 0.063" should be more than sufficient and cheaper.
Have you tried this before?
I have a JD2 Model 3 bender. They reccomend a tolerance of wall thickness and OD for each die. I just stick to what they recommend to stay clear of issues.
Not in the diameter you're talking about but I've done 6061-T6 1"x0.065" before with no problems. Annealing is the key. Your bend ratio is also more modest than typical (3.7:1) - this will also help.
Any chance of visiting a local metal place and seeing if they sell cut-offs? There is a place here that does that with the leftovers from their fab shop and you can get a foot of tubing or a section of sheet dirt cheap. Its nice for experimenting. I'll probably be stopping by on Saturday. I have a 1.5" diameter 6" CLR die for my bender. If they have a scrap piece of 1.5"x0.065" tubing I'll grab a piece and try it.
How many degrees do you need to bend?