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Subject length???
     
Posted by tylerr on February 03, 2004 at 12:46 AM
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In Reply To seems like i have to bust this out about 2/3 times a year> posted by Wagz on February 02, 2004 at 11:27 PM
     
Message oxidation in a combustion chamber doesn't happen in an instant.
anyway here's a slightly more scientific run down
iridium is approx the same size ~1-2% as platinum
BOTH form a fcc lattice structure=>~equil densities
iridium has roughly TWICE the conductivity as platinum. (HUGE!)
iridium is more stable at high temperatures.
industrial iridium is more consistant due to fewer isotopes
i've never heard of a larger, more powerful arc to slow down combustion, but i have heard of a little something called "quasi-equilibirium" in thermodynamics that would definately explain why a plug that sits closer to a wall would slow it down.

by the way both iridium and platinum are extremely resistant to reacting with fuels and fuel related chemicals.(reason they last so long) iridium retains this property through a much larger temperature range. (around 750 K more on the high side)

     
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