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It is general question concerning DENSO SPARK PLUG that is often.
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I have a 4AG engine NA tuned, with a Solex 44 dia. carburetor installed, giving a 200PS output. Which plug is good for a car such as this? |
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| DENSO has Iridium Power and Iridium Racing to meet the needs of tuned and racing engines. For the engine described in the question, the right plug should be around Iridium Power IK (IQ) 22, 24, or 27. Here is an introduction to using the different types of the Iridium Series on racing engines. |
| Iridium Power: |
| NA Tuned (Short distance racing), Turbo tuned where a regular turbine has been tuned to increase the boost. |
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| Iridium Racing (01 Type): |
The 01 Type is usually called the slant ground electrode type. If your car is turbo tuned where the turbine has been replaced and the boost pressure is above 1.2 to 1.3kg/cm2, an Iridium Racing 01 type is needed. Also, if a NA tuned engine with comparatively high vibration (4 cylinders) is to be raced over long distances, switching to this type can increase the reliability of the ground electrodes.
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| Iridium Racing (02 Type): |
| The 02 type (flat ground type) is appropriate for higher output engines than the 01 type, but because the spark position is withdrawn compared to the 01 type, only consider this plug for racing applications. |
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