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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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