Quote [Its my similar contention that if compression rises, it takes a higher voltage to arc jump current across the gap. Extreme high compression racing engines use HV coils that have the capacity to rise to higher firing voltages as necessary to fire the plugs. John T ]
John T ,I liked to do that "quenching" of the spark,on a multitude of spark plugs, both aero and auto, using the Champion Spark Plug tester and a large compressor.
Some plugs would quench at a relatively low pressure whilst others would still be sparking with the pressure way up.
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Today's Featured Article - Self-Starting Tractor - McCormick 10-20 - by Francis J. Robinson. I remember it very clearly even though it was almost 50 years ago and I was only about seven years old. My Dad had purchased a new Ford-Ferguson tractor and basic set of implements when he started farming just about the beginning of W.W.II. It was considered a pretty nice outfit for their 70 acre central Indiana grain and livestock farm. Dad spent several years during the war testing aircraft engines at Allison Engineering in Indianapolis working seven days a week on a twelve hour night sh
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