5 thoughts on “Free Plans: David Kerzel’s C02 Engine”

  1. Eric, steel balls are available at McMaster-Carr. There may be other places as well as probably cheaper. Search for ball bearing balls.

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  2. Where have you placed the exhaust valve …because I am having a confusion if the co2 is sucked , the piston goes down …then how will the piston come up again ……!! Please help me out

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