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Old 07-29-2019, 11:22 PM   #4 (permalink)
California98Civic
Cyborg ECU
 
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
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Quote:
Originally Posted by freebeard View Post
... personally I'd go with Polymetal [or equivalent] or 1/8" sheet ABS. Polymetal is stiffer, but ABS can be heat-formed and cemented.
Polymetal! Of course. I had forgotten. I am going to start with just the spoiler, which has just one very mild curvature. Not making the side plate yet, probably, and its the part needing more bending. The rigidity of polymetal will be perfect.

Quote:
Originally Posted by freebeard View Post
Bonneville spoiler is subjected to low pressure on the bottom, just as a diverter is subjected to high pressure on the top. Use turnbuckles with magnets on the end. ...
Turnbuckles are perfect.

Quote:
Originally Posted by Vman455 View Post
I'm not sure you'll be able to calculate that to any degree of certainty without some data. Do you have a Magnahelic or any other type of pressure gauge?
No gauges. There is no formula for an reasonable estimate? This aint a race car... seems like an estimate should be good enough if I build something twice as strong as estimated need and be fine, no?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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