Spark plugs suggestion

[Tamago]

Originally Posted by RedRide

OK....So, plugs are good for the life of a an engine no matter how many miles that may be.?

It's a fact of life that all sparks are not created equal even with the same type of plug and the "qualty" of a spark will effect performamce to one extent or another.
Dyno tests bares this out.

You have some "learning" to do.

so you're telling me that a spark has a quality? electricity jumps "slower" through the air the older the plug gets?

electricity (light as well) travels at 186,000 miles per second. the erosion of a plug, as already mentioned, does NOT affect the "quality" of the spark, it simply creates a further distance for the spark to travel. the farther the spark can travel, the more "bang" you get from each plug firing. in some cases this will yield a "better" burn of fuel. but again, this all goes back to the actual device that creates the high voltage electricity in the first place, the coils themselves. once the coil cannot create enough voltage to jump the eroded gap in the spark plug, the plug no longer fires consistently. but as the gap increases (up to the point of failure) the spark SIZE increases, meaning a plug actually gets MORE efficient at igniting fuel.. do you understand?

now, a fouled plug will have a shorter spark, simply because the electricity does not have to travel as far (due to carbon or other buildup) from the electrode. smaller spark (what you call quality) = less capability to ignite the fuel/air mixture inside the combustion chamber.

so, if iridium plugs are considered to be a 100,000mile plug, changing them at 50,000miles is pointless. have you ever actually pulled a denso IK22 out of your engine and looked at it? even a 100,000mile denso plug looks almost brand new, no visible signs of erosion (on a stock, non boosted engine).

quality of spark? c'mon dude.