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You have done a great job with the air engine series and i would love for you to continue. As well as it was very nice of you to release your design. I have a question on the exhaust system though, where is the exhaust output. From what i see it is the two slots on opposite sides of the channel for the push rod so does it just release the air back into the crankcase and out the back? Thank you for reading this and i wish you the best of luck on the rest of your projects.