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It is general question concerning DENSO SPARK PLUG that is often.
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| These are plugs developed for racing, and there are many people who use these plugs in the All-Japan Road Race Championship JSB1000 class and in drag racing. Because the ground electrode is gone, there are the following advantages and disadvantages. |
| Advantages | |
| [1] | When the engine is tuned so that the compression ratio is increased, these can avoid interference with the piston. |
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| [2] | Because there are no excess projections into the combustion chamber, the combustion efficiency at high revolutions is improved. |
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| [3] | Difficulties due to the ground electrode can be prevented. |
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| Disadvantages | |
| [1] | The ignitability becomes worse, and thus feeling and response at low and mid-revolutions deteriorates. |
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| [2] | The engine characteristics become peaky; because of this, in the popular ST600 class, where conditions are severe, there are many people who use plugs with ground electrodes. |
