Steve,
I think the minimum is directly affected by plug gap and the resistance of the plug wires and both vary boat to boat. A 0.035" plug gap will require more energy to arc than a 0.030" gap.
Therefore I'm not sure Pertronix can provide a definitive number given the possible variables.
__________________
Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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