Quote:
Originally Posted by PeteKz
I'm just saying that the electrical conductivity of the materials is insignificant in the total picture of what makes a plug good for your application.
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It matters! Regardless of how much the rest of the system is impacted by resistance, the spark still has to make the jump across the electrodes. Silver makes that easier than iridium.
The electrical conductivity becomes quite important in situations where you have high cylinder pressures. That is where you want the most electrical conductivity possible. How hard it is for that spark to generate between the center electrode and ground electrode is most certainly affected by the electrode material choice. The better the electrical conductivity, the better the spark plug handles higher cylinder pressures.