Originally Posted by ARCOgraphite
I will jump in here, I was a master engine mechanic and built a few race cars and did performance tunes
in the 70's and 80's
The fine wire technology only allows the plugs to be easier to fire and
have less chance of misfire.
They are better than Nickel-copper plugs for all concerns
As they are easier to fire, the gap can be a bit larger without misfire (than a copper-nickel sparkplug)
The Iridium is just a much tougher metal that will wear less over time, thus the tip can be made fine compared to a copper-nickel
plug
Damage due to changing gap depends more on HOW you try to change the gap
the Iridium tip is easily broken, so you do not want to gap the plug by prying between the centre and ground electrodes.
You should never adjust the gap this way on any type plug anyhow.**
Gap is adjusted by bending the GROUND side electrode.
My rule is only tighten don't enlarge where the ground electrode is pointing UP wards of 0 degrees plane.
**The ramp-type champion is a gauge to CHECK the gap, not to force it open.
The GND electrode adjuster is the little hole - like a miniaturised bottle opener
Quote
The fine wire technology only allows the plugs to be easier to fire and
have less chance of misfire.
They are better than Nickel-copper plugs for all concerns
As they are easier to fire, the gap can be a bit larger without misfire (than a copper-nickel sparkplug)
The Iridium is just a much tougher metal that will wear less over time, thus the tip can be made fine compared to a copper-nickel
plug
is platinum the same as iridium regarding toughness & low chances of missfire with larger gap?
Quote
Gap is adjusted by bending the GROUND side electrode.
My rule is only tighten don't enlarge where the ground electrode is pointing UP wards of 0 degrees plane.
platinum plugs i found match copper parameters with same heat range from Bosch are 1.1mm gap & from NGK are 1.0mm (comparing to 0.8mm gap in original copper plugs)
so is it safe to tighten the gap from the ground (upper 90 degree bend tip) or just use it as it is?? and why?