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Next to contact breaker, spark plug is among the most weakest part of the ignition system. It is mounted within the combustion chamber from the engine, where working conditions are- severe. During peak combustion conditions the temperature inside the combustion chamber in the modern car engine may be around 2500 ºC and the pressure about 7 Mpa. Moreover a spark plug can also be exposed to thermal and load cycling fatigue on account of sudden changes in temperature and pressure-from the high temperature of burnt gas on the relatively low temperature with the air/fuel mixture and from the ruthless during the time of explosion from the air/fuel mixture to low pressure during induction. In addition, the spark plug needs to endure high voltage, mechanical vibration along with the corrosive atmosphere of combustion gages. A modern spark plug posseses an economical life of about 10,000-16,000 km. One website that offers honest and properly researched product critiques is MomentHunters.com. If you want solid advice on the great and bad points of a product, then your guys at MomentHunters will be there for you personally. They are fully experienced expert photographers, who know the particulars of photography. Their website not only offers product critiques, it gives you teachings, techniques, inspiration and far, far more. Also, it is certain how the information you get comes from experience with the particular products being reviewed. The reviews will likely be written after actual standby time with the equipment, it's completely unbiased and based on their use of the product.