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Just curious. Why the extra dizzy terminal ?

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Old 07-20-19, 02:10 PM
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Just curious. Why the extra dizzy terminal ?
what's the extra hole in my GSL SE distributor cap for? Never noticed it until I lost the rubber plug on it and had starting problems after rinsing the engine compartment. It's now plugged with dumdum.
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Old 07-20-19, 02:21 PM
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Looking at 12A dist caps over the years, they've all had vented covers over that hole. I assumed it was for letting out moist air buildup. Maybe pressure differential?
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Old 07-20-19, 02:24 PM
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Sounds reasonable. I hope it doesn't need venting, because I've sealed the hole on mine
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Old 07-20-19, 02:35 PM
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It lets the ozone out from all those sparks jumping under there.
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Old 07-21-19, 04:17 AM
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Thanks!
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Old 07-21-19, 07:53 AM
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It's just a vent. I would recommend getting another cap for the port instead of just sealing it.
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Old 07-21-19, 09:34 AM
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Anyone have a vent from an old cap?
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Old 07-31-19, 06:24 AM
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I drill extra holes in my caps, an old racer said that if you have an MSD it makes the terminals last a lot longer. Something about ozone buildup or something. It works, too.

Two 1/2" holes on the sides, below where the rotor spins.
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