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Message
If you order from Burns and bent
tubing, you will get it in the "O" condition or a slightly harder condition due
to the cold work hardening from bending. I found that heating them at 500F
for 8 hours seems to harden them a bit - they don't ding as easily as the "O"
condition.
I'm guessing this is something you have to do when your
wife isn't home :-)
For intake runners, I generally use 1 3/8" OD
0.058 or .065 wall thickness for the primary. I use 1 5/8" OD same
wall thickness for secondaries. I have used from 1 1/4" to 1 3/4"
but I think the other diameters are about optimum.
What
would you guess for a size when using only two runners from intake to the
TB? I was planning to match the size of the TB throats as much
as possible, which will make the pipes about 2-1/8" ID. By
coincidence, that works out to almost exactly the same area as your two
pipes combined.
You can get the Burn's lengths and then
added to the lenght. You can do it by adding a short length (2"?) of the
next larger diameter size as a coupler so that both ends fit inside.
However, its difficult to find a welder that can weld thin tubing. I have
had good success with brazing the thin wall stuff.
Finding a welder in my house that can do anything useful is
a challenge. All I've managed to do with the new TIG machine is give
myself a good sunburn. I was going to practice on some aluminum today, but
found that just about all I have is 2024, which is effectively
un-weldable.
You can get pipe bends
(Elbows) from RBWagner schedule 40 which has walls of approx 0.12 ".
It is much heavier but you can use it just for the bend and then stick in
straight light weight tubes from most of your runner lenght.
A dandy idea! More welding though.
Just a few options. Me, I am currently making
the mold for another plastic intake part. This time it will be for the
lower part of the intake, so I can use inexpensive straight tubing with the bend
in the plastic casting rather than keep paying for expensive pre-bent
tubing.
So are you
making these plastic parts strong enough to hold 10 psi when you add the turbo
:-)
Has anyone
considered using really heavy hose for the runners, rather than something ridged
like aluminum, or fiberglass? It would have to be fuel resistant of
course, which rules out silicone I believe. I'll have to hit McMasters for
2" Viton hose :-)
Thanks for
the info.
Cheers,
Rusty
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