I've been doing some research lately on spark plugs and I have yet to find a definitive answer as to which plugs to use in what engines.
So far I have the following data:
||Metal|| ||Melting Point|| ||Electrical Conductivity|| ||Thermal Conductivity||
||Copper|| ||1083 C|| ||.596 x 10^6|| ||400 W/(m K)||
||Platinum|| ||1768 C|| ||.0966 x 10^6|| ||72 W/(m K)||
||Iridium|| ||2410 C|| ||.197 x 10^6|| ||150 W/(m K)||
I forgot the units for electrical conductivity, but regardless, the higher the number the more conductive the metal is. In terms of thermal conductivity the higher the number the faster it can dissipate heat away from the tip of the center electrode. And melting point speaks for itself. According to the numbers, it doesn't seem that it would matter a lot what kind of plugs a naturally aspirated engine requires, but some are picky. However, when it comes to supercharged and turbocharged engines, I wouldn't know what to use. Iridium seem like a clear choice because apparently they withstand higher melting points and require less voltage to jump the gap because the center electrode is very thin;however, its thermal conductivity is not high like copper and could result in pre-ignition. Platinum don't seem like a good choice because they're thermal conductivity is too low which could result in pre-ignition due to the center electrode not being able to dissipate heat fast enough. Copper on the other hand has a very low melting point which could result in damaged center electrodes, but its thermal conductivity is extremely high meaning it can dissipate heat better.
Anyways, does anyone else have resources or knowledge that could possibly benefit me in my study.