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It is a question concerning the IRIDIUM TOUGH that is often.
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| The 0.4mm center electrode lowers the required voltage by several kV. |
| Recently, there has been a trend to increase the compression ratio to increase output in engines. This means that the required voltage of spark plugs tends to increase and high compression is required in highly tuned engines. When this occurs, the required voltage increases and, in the worst case, sparking ceases while the engine is running. Minimization of the electrode diameter is an effective way of avoiding this. In the IRIDIUM TOUGH, the center electrode has a diameter of 0.4mm. Because required voltage is kept low, this enables the IRIDIUM TOUGH to be used in high performance engines and for high response driving. The following graph gives examples of required voltage measurements for IRIDIUM TOUGH and normal spark plugs. |
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| The required voltage is reduced by 3-5kV for IRIDIUM TOUGH as compared to normal spark plugs. |
