Wow...finally the right answer I was looking for Now I have learned Something new. thanks again.engineerted wrote: ↑Sun Feb 03, 2019 4:06 pmThe Holes are for ventilation, there will alwasys be a small amout of electrical arcing from the rotor to the spark plug terminal posts inside. This arcing will generate ozone, the holes are there to vent this ozone. Too much ozone gas, and the air will ionize and the arc will start to jump around the inside of the cap and forming carbon tracks. Not good!
On the race car, I run a high energy MSD multi spark ignition and MSD recomends that you should add 1 or 2 additional holes to the cap. I don't recommend adding holes for a street car that maybe subjected to running in the rain or parked out side.
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