I'm not sold enough to pull out my Iridiums just yet. I'd like to hear what those who put them in a year ago have to say about them a year later..
Hey Darn, what's the difference between the Iridiums (which I am running also) and the E3 I'm not planning on changing, Just like to know
From a few people I've talked with, the E3 is supposed to be a faster spark (hotter) causing quicker throttle response and better gas mileage. But I haven't heard from anyone who's been running them for a long time yet.
To add a bit to what Dave said the actual spark inbetween a sprak plugs center electrode & ground strap doesnt dictate a spark plugs heat range,its the size & lengh of the porcelin of the center electrode of the plug that dictates a spark plugs heat range.
HOW?, Well if the porcelin of the spark plugs center electrode is sized to hold/retain more heat then the center electrode of another spark plug thats sized to hold/retain less heat the plug that retains more heat in its center electrode is in fact the hotter of the 2 plugs.
So again,it's not the actual spark (or # of sparks like with E3/splitfire plugs) inbetween the center electrode & ground strap that dictates the plugs heat range like is often thought to be the case.
Just a tidbit on plugs with mutl grnd electrodes resuting in mult sparks vs 1 spark of std plug.
When Splitfire plugs came out many yrs back with the Y type ground electrodes for mult sparks they ran dyno
testing in 350 cid small block chevy motors running a splitfire plug in every other cyl and a stock std AC plug in everyother cyl.
Then post runing the motors for x amount of time they removed the heads from a couple of the motors and you could actually see which cyls had splitfire plugs and which cyls had std plugs.
The cylenders with splitfire plugs that had a split Y type groundstrap that made for mult sparks each time plug fried had nice light tan looking exhaust valves & pistons showing a nice efficient combustion.
But the cyls with std AC plugs in them had dark sooty looking ex valves and pistons showing a less efficient combustion/burn.
Ady they also ran tests with 8 std plugs vs 8 spltifires back & forth in the same dyno motor and the splifires consistantly used i think it was 2.5-3% less fuel then with std plugs.
When i went from std NGK B8ES plugs to SF405D splitfire plugs in my kawi kz1000 it went from a max of 48mpg to consistantly getting 50mpg to once in a while 51mpg in same exact driving cond/same roads riding 2 up with the sparkplugs being the only change made at the time.
Between the dyno test acrticle i rvu'd showing more efficnet combustion and reduced fuel use and my personal experience of the splitfire plugs increasing mpg on my Kawi i feel the mult spark ground strap design of the splitfire plug did in fact improve combustion as proven by increased mpg on my bike and pic's of combustion chambers on the dyno motors showing cyl's with splitfires burning cleaner/more efficiently.
On the iridiums,the main
positive about iridium plugs is the fine/thinner iridium wire of the center electrode takes less voltage/current to fire/generate a spark inbetween center & grnd electrod which is a plus for guys with carbs that are setup on rich end of fuel calibration making them get dirty quicker and the iridium is also more resistant to wear/gap errosion extending its srv'c life over that of a std design plug too.