We start at the copper plug. The original spark plug.
Copper is an excellent conductor of electricity but doesn't offer the life of most other plugs.
A few copper variants have hit our market, the Chinese didn't like the low lifespan of copper and they created a plug that I don't think ever made it to mass production but looks interesting enough.
We've all seen the splitfire.
Not many of us have seen the Halo plug though.
The E3 plug.
A few designs have taken the idea of getting a nice and open path to the combustion chamber just a little bit further.
A company in Mexico makes (made) this Technica plug.
The Torquemaster Plug is available online at a few places. This type of plug uses the surface-gap discharge method. Surface-gap gets its benefits because the spark takes less voltage to travel a long distance over the surface of the plug then it does to go through the air. This gives you more spark exposure area.
A surface-gap discharge plug that is also long life is the Bosch Platinum +2 and 4 plugs.
Then you have your typical Platinum plug.
And your Iridium.
Finally, you have the Pulstar plug. This plug differs from the plugs above by incorporating a peaking capacitor into the plug.
