Brian Trubee discovered the holy grail of tube bending.
http://www.rbwagner.com/

1 inch inside radius   1 1/4" PIPE (1.66" OD)

.....................  steel    alum     stainless
90o w/(2) 2" Tangents   266-2    290-2    315-2

R & B Wagner, Inc. Since 1850
 Railing Systems and Components
 Architectural Fittings and Custom Bending
 4480 North 124th Street; Milwaukee, WI
 P.O. Box 423; Butler, WI 53007
 1-800-786-2111 · 414-461-2111
 FAX: 414-461-5124
 Email: info@rbwagner.com

Pipe is round material manufactured to a "nominal" (not actual) inside diameter. Tube is round, square or rectangular hollow material manufactured to a specific outside diameter and wall thickness. Tubing is described by the actual outside diameter and wall thickness, i.e. 2" OD x .120 Wall Steel tubing.

Pipe is described by the nominal (not actual) inside diameter with the wall thickness described by the term "schedule". Common pipe sizes are listed below.

Paul Lamar

Finn Lassen wrote:

JC Whitney has 180o bends in 16 gauge mild steel for less than $10. Seems 16 gauge is 1/16" thick. I think I'm going to take Tracy's advice and do the intake system in steel. I can weld that with my Henrob, unlike alu.
I saw one poster using 1/8" alu tubing. 16 gauge steel would be same weight. If I could, I'd prefer making the runners even thinner. They really only have to thick enough to prevent them from collapsing into themselves under vacuum. .035 steel or SS 180o bends would be great.

Still haven't solved how to get air into the dynamic chambers without either doing like Tracy and cutting a hole in the cowling or re-locating the oil filler tube.

Finn

Check with Mazdatrix Finn. I think they have some steel intake  flanges
already cut. They do their prototype intake manifolds in steel
because it is easier.

Paul Lamar
 
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