will an e 3 spark plug improve performance or cold starts ?
Also a sharp edge on the electrode creates the best spark, as they erode, round off this causes a smaller spark. That's what iridium does, it coats the electrode and slows down this wear so the plugt retains a better spark longer.Per NGK...
"Unfortunately,there is no single answer to this question. As spark plugs grow older, they lose their sharp edges as material from the center and ground electrodes is slowly eroded away. As the gap between these two points grows, the voltage required to bridge the gap increases proportionately. Even the best ignition systems will be strained to supply enough voltage to completely burn the fuel. It is at this point, when fuel is being left unburned, that the time has come to change spark plugs.
Replacing worn out spark plugs with new ones (with sharp new edges) effectively restores the ignition system's efficiency. Misfires are reduced, power is restored, economy of operation is enhanced and emissions are reduced.
The best guide is the manufacturer's recommendation for your vehicle, as this particular service varies from brand to brand and model to model. In the absence of this information or in conjunction with it, you can rely on the advice of a mechanic who is familiar with your type of vehicle. In the best of all worlds, this would be a mechanic who is also familiar with the vehicle you own. If you find a good mechanic, whether dealer or independent, stick with him. The better he knows your personal vehicle, the better he will be able to diagnose and service it. The end result is very much like a doctor-patient relationship and, in the long run, you will have a healthier vehicle."
I think so, but IMO iridium is only really a benefit on older plugs. If you change you plugs often, than it's not really needed. I had a Lincoln LS and you had to take the intake manifold off to change the passenger side plugs, I used iridium's in that thing!! But in my other vehicles I change the plugs pretty often so I just buy good quality plugs.does ngk make a iridium plug for a sportsman 500?:gruebel: