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Old 01-18-2016, 01:42 PM   #92 (permalink)
oil pan 4
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For get about using PVC for mock up.
Get some heat exhaust manifold heat riser tubing. Its like an all metal clothes dryer exhaust vent, but a lot smaller.
It should be available down to about 1''.

Or if you want to use real small tube get some electricians to bend you up tubes out of 1/2or 3/4 inch EMT conduit. Electricians are great at putting smooth wide radius bends in tube to go around obstacles or fit in a tight space and then making copies of a tube.
You can even get stainless steel conduit.

You could have electricians bend up some cheap galvanized EMT in what ever size you desire, then once you know it works have them copy it in stainless.

Those bend radiuses in the drawing look pretty much exactly like what you get from a conduit bender.
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