Six times harder than platinum; iridium doesn`t melt in temperatures up to 4;000deg. Because the iridium electrodes of these plugs can be shrunk to only 0.4mm; voltage requirements decrease while firing performance improves 360deg.er welding of electrode provides a seal that resists wear even in the worst conditions Ground electrode features a tapered cut and U-groove that form a large volume area for the flame`s center Use NGK reference chart to order and stock these plugs
IRIDIUM SPARK PLUGS
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