A cold spark plug is designed to operate at higher than average temperatures and disperse the heat inside the cylinders, improving combustion, performances and engine reliability, reducing the risk of detonation. The higher the number, the more the spark plug will be "cold", and more adapted to tuned engines and sporty use. If the letters (for example IKH) indicate the spark plug's shape and thread size, the numbers (from 20 to 27) indicate the heat range, basically meaning how well the spark plug can operate in intense conditions. Iridium is very heavy and dense metal, ensuring that Denso spark plugs have a longer lifespan than OEM ones, withstanding more than 100.000 km in standard use. Whatever your use or engine set-up, the correct choice of spark plug is very important. Because the IRIDIUM TT is low in combustion variation and enables a reduction in idling speed, further improvement can be expected in fuel efficiency.Denso Iridium IKH24 Spark Plug Specifications These advantages are achieved because the miniaturization of the ground electrode enables better ignitability, improving combustion efficiency. As this figure shows, IRIDIUM TT can reduce the Pmi COV approximately 3.1% and accordingly reduce fuel consumption by 2.4%, compared with the Iridium Spark Plug. Pmi COV (coefficient of variation) in the diagraph shows fluctuation in IMEP (indicated mean effective pressure). The previously specified Type-1 of the IRIDIUM TT was used in this examination.
The evaluation was conducted by turning on the ISC and setting the average engine speed to 800 rpm (idling). 4 shows the results of the examination of combustion variation and fuel consumption, using a 1,800-cc, four-cylinder engine. This figure shows that IRIDIUM TT are superior to the Iridium Spark Plugs in ignitability.įig. This figure shows the results of evaluating IRIDIUM TT. A higher idle speed represents higher ignitability. The evaluation checked idle speed at equal throttle opening with the ISC (idle speed control) turned off. 3 shows the results of evaluating how the miniaturized-portion protrusion direction may influence the ignitability of an engine. *1 FEM(Finite Element Method analysis): General method to measure electrical field strength.įig. The more electrical field strength is getting high, the more it becomes easy to fire with low voltage. The above shows the strength of electrical field in case certain voltage changes on Iridium plug and IRIDIUM TT. As a result, combustion is good for all types of driving, the engine starts easily, and acceleration improves. The smaller the electrode the more concentrated the electric potential at the tip of the electrode and the stronger the electric field that affects required voltage and the lower the required voltage. To enable use of electrode, at 0.4 mm in diameter, in the IRIDIUM TT. The most advanced technology in the world has been employed To lower the required voltage and improve firing performance. These observations show that, as the results of the ignition/firing simulation indicated, a fine ground electrode can reduce required voltage because it enables the spark gap to be narrower, while realizing higher ignitability than the Iridium Spark Plug. The photographs indicate that, in the case of the Iridium Spark Plug, the size reduction of the gap (from 1.1 mm to 0.6 mm) interfered with flame growth, while in the case of IRIDIUM TT, flame growth was ample and greater than that of the Iridium Spark Plug in spite of the narrowed spark gap (0.6 mm). 1 shows the results of studying the influence of electrode shape on flame growth, using the Iridium Spark Plug and IRIDIUM TT. The photograph shows flame reflected by the variation in density. Using DENSO's exclusive iridium alloy having a very high melting point, the tip of the center electrode can be shaped very thin and fine, reducing spark voltage requirements and greatly improving ignitability. However, we've managed to attach a fine 0.7mm-diameter platinum electrode using a 360° laser welding technique.Ĥφ0.4mm Ultra-fine Iridium Center Electrode Traditional ground electrodes could not be made too small without reducing groundig strength or increasing electrode wear. In order to maximally prevent quenching effect, the ground electrode needs to be made as small as possible.
The iridium tip is mounted with an "All-around Laser Welding" method that insures high reliability even under the most severe driving conditions.ģφ0.7mm Needle-Shaped Platinum Ground Electrode All specification types include an embedded, highly reliable, monolithic resistor to eliminate electoromagnetic noise interference from all kinds of electronic devices.
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