This update video has a few developments to the OBA system, and - gasp - narration!

I get about 10cfm at 90psi out if this setup - using math found here. http://www.truetex.com/aircompressors...

York Rpm math:
Crank 7"

Alt 2.25" (serpentine)
Alt 2) 2.75" (v belt)

York 6"
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Crank to alt: 1:3.11
Rpm 1000:3100

Alt to Alt (2): 1:0.819
Rpm 3100:2538

Alt (2) to york: 2.18:1
Rpm 2538:1164

Crank to york: 1:1.164
Rpm: 1000:1164

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Crank to alt: 1:3.11
Rpm 1000:3100

Alt to york: 2.66:1
Rpm 3100:1165

Crank to york direct: 1:1.16
Rpm 1000: 1160

Background: I burned up a 12v tire pump (wally world special) trying to pump up a heavy trailer tire. Decided to look into onboard air, and after seeing alot of jeep guys mounting yorks in the engine bay, decided I'd have a go at it. Could not be happier - it puts out SERIOUS air. Impact gun as much as you want, pulling my 8 lug wheels is no problem for example. $150 -$170 in whole project. York was junkyard for $40, air tank was craigslist for $30, etc.

Go build something! 👍

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