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Old 01-13-2016, 11:16 AM   #82 (permalink)
Shawn D.
Harebrained Idea Skeptic
 
Join Date: Jun 2008
Location: Alpharetta, GA
Posts: 211

The White Car - '84 Mercedes-Benz 300td
90 day: 28.84 mpg (US)

The Blue Car - '86 BMW 535i
Last 3: 23.86 mpg (US)
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Quote:
Originally Posted by Old Tele man View Post
And, (maybe?) you aren't restricted to ROUND header pipes (?!?!?):



...which remind me of waveguides used in microwave radars!
Besides being far more difficult to find as mandrel-bent pieces and harder to fabricate, flow would be worse due to interference drag at the 90° intersection between the walls. The only reason square-ish runners are used in intakes or exhausts is for transitions dictated by other components (e.g. bolts, pushrods, adjacent runners).
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