Spark Plug Gurus Get In Here!!!

[Marauderjack]

I have been using copper core plugs with my ProCharger installation per ProCharger recommendations with good results!!:beer:

They recommend changing them every 15K miles and I have done that but they always looked new so I ran the last set 30K miles and they seemed OK but when I installed new ones last week it was like I ADDED ANOTHER SUPERCHARGER!!!!:eek:

The throttle response was improved and it felt like I bolted on another 100 HP.......I cannot explain it??:shake:

I had thought the sluggishness was simply H-O-T air and typical Summer performance loss....WRONG!!!:cool:

So....what happens to plugs under boost conditions or even N/A to make performance fall off so badly??:confused:

[BlueFusion]

They get hot and they can bend to open or close the plug gap. Copper has the lowest melting temperature and therefore lasts the shortest amount of time. I'll always stick to Platinum since the melting point is higher and they generally last 70k+ miles in most engines and probably atleast 50k on FI engines.

[fastblackmerc]

What he said.

I bet if you checked the gap on the old plugs it will not be to specs.

[TooManyFords]

Using copper is absolutely the way to go when using positive displacement. The idea being that you *want* the plugs to go away before any other harmful damage can occur, i.e. detonation. Let the copper take the fall, not the pistons, rods and the block.

And if it helps, I always change mine every 10K or less.

[Marauderjack]

Using copper is absolutely the way to go when using positive displacement. The idea being that you *want* the plugs to go away before any other harmful damage can occur, i.e. detonation. Let the copper take the fall, not the pistons, rods and the block.

And if it helps, I always change mine every 10K or less.

I'll be doing the same John!!:beer:

The only thing I can figure is that when the center electrode erodes (rounds off) you don't have a sharp, clean point for the spark to jump from and thus get a weaker spark and poor ignition??:confused:

It is truly amazing the difference!!!:eek:

I actually though my old motor was getting weak but it was just the plugs!!:cool: