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Real-World Repairs for Real-World NOX Failures 200

It is kinda intuitive there are pulses created by the exhaust stroke, but that same intuition (as I perceived it) has the net pressure at one atmosphere or above.

The idea that the pressure in the exhaust system falls below atmospheric is maybe not so easily taken in my simplified view of the process. I'd be grateful for someone's sensible explanation.
--
Art Benstein near Baltimore Crrrrazy Ray's!






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