STUDY OF EFFECT OF CUPPER CORE ON TEMPERATURE AND EROSION OF ELECTRODE

Temperature of spark plug can effect on the lifetime and combustion quality. The electrode erosion and gap growth are consequence of temperature rise. The temperature of spark plug should maintain in allowable range to increase of lifetime. Utilization of materials that have better heat transfer is one of the useful methods to decrease electrode temperature. So، high heat transfer ability of cupper can be effective. Considering dependence of erosion of nickel electrodes to temperature، it is required to study effect of cupper core on decrease of temperature in electrodes. In the present effect of cupper core on electrode temperature is studied by two types of spark plugs that have same heat range. According to results، utilization of cupper core resulted to decrease of electrode temperature. So that electrode temperature is decreased 115 °C while engine operates by CNG at 2500 rpm under full load conditions. The difference decreases as engine speed increases at full load conditions until reaches 90 °C at 6000 rpm. Therefore cupper core will lead to 10-15% decrease in ground electrode temperature that can decline electrode erosion 2 times.