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From Knock Sensor to Stethoscope

From Knock Sensor to Stethoscope
In 2007 a friend of mine, who loves to build and tune racecar engines, needed a better way to listen to the sound in the engines, preferably from the control area of the test rig. "Why don't you listen to the output of the knock sensors?", I asked him, "that's what your ECU does."
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