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...two very important "spark plug ignition" characteristics are: (1) spark "rise-time" and (2) arc "duration."
..."some" resistance in the sparkplug wire is actually needed/used to "prolong" the arc duration time, which is necessary to ensure complete ignition of lean A/F mixtures in high turbulence cylinders.
...spark "rise-time" is what's important when attempting to get the spark to initially "jump" across the spark plug gap and NOT be shunted to ground though oily-carbon buildup on the spark plug insulator (ie: older worn engine)...faster is better here!
...arc "duration" is what ensures that ALL the A/F mixture in a high-turbulence cylinder "sees" an ignition source (the "arc") with sufficient energy (>30 mJ) for long enough (~1000 uS)...here longer is somewhat better (too long, and plug erosion becomes excessive).
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