take off 5800 rpm at 40 on the map gauge prop set fine I am unsure how accurate the knock meter is I fitted it to check for detonation against mogas and avgas fuels by switching between the tanks, low and high revs it hardly lights up but always has in the mid range Do these engines all run a bit rough mid revs As I said the sensor is bolted under a rocker cover stud on the No 3 cylinder
