I've wanted to try these for a long time, now, but couldn't justify the price. I found out that a friend of mine works at a place that sells them, so I'm going to ask him for a good deal.
If he'll hook me up, I'll try them, and post results. I may do it even at retail price. I would just have to save $30 worth of gas to break even, over the lifetime of the plugs, since they would cost $30 more, retail, than the OEM plugs. For 4 &3 cyl. cars, the investment would be less.
I know that they will give me more mileage and HP. I just don't know how much, yet. It may be worth the initial investment, like K&N filters, and synthetic oil.
I'll let you know.
had to look them up. well, silver is the best conductor.
You still probably have a resistance in the plugs to combat ignition noise in the car radio, and to keep the power going to the car's computer clean. Even if the plugs have no resistance, the plug wires probably do. The small fraction of an ohm difference between copper and silver conductor is probably not going to make a discernible difference in the voltage reaching the spark plug gap. So, while silver IS the best conductor, and gold might even be better because it won't tarnish, I just don't see where that alone is going to make a better spark plug.
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The better choice is a thinner center electrode so that the spark jumps the gap easier due to higher e-field at the finer tip and you can make the gap larger to increase the energy released with the larger spark. Iridium plugs are the way to go as far as I know and they last a long time too. Conductivity is not as important when you have 20-30k volts and only about an amp of current flowing for a fraction of a second.
I don't know if it makes a difference, but I'm running a 45,000v coil, and MSD box. I don't know the amps. I'm trying to get the strongest spark possible, for the leanest burn possible. I've seen HP gains on stock cars with these, so I'm assumming that they will help burn lean mixtures (20:1 or more). I also talked to a professional drag racer who swore by them.