tapered point
Traditional center electrode, 2.5mm
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Tapered point center electrodes operate on the same principles as fine wire center electrodes which come under a variety of names depending on manufacturer, IE:(Ultra-Fine electrode, Taper cut electrode, Necked down electrode). Originally designed to improve starting and reduce fouling in two-stroke engines, this design was found to improve performance in four-stroke engines as well. All operate on primarily the same principle, a spark plug with fine wire electrodes will perform better than a traditional plug. There are two reasons for this, first is because a smaller center electrode requires less voltage to jump the gap. This means fewer misfires, which should be seen in higher mileage and more horsepower. The second reason is smaller center electrodes reduce quenching. The smaller center electrodes have required exotic metals such as platinum or iridium so that they can still maintain (and sometimes surpass) the longevity of a traditional spark plug. Currently the finest wire performance plugs available are made by Denso at 0.4mm diameter and by NGK at 0.7mm diameter, a traditional center electrode is typically 2.0 to 2.5mm. |
