NGK Glow Plug CZ163 |
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Diesel engines, unlike petrol engines which rely on a spark to ignite the air-fuel mixture, function due to the auto-ignition of diesel fuel when subjected to high pressures. Under high pressure, the temperature of the diesel fuel increases to a point where the fuel self-combusts. In cold weather, however, this temperature is not always achieved and glow plugs assist by heating the air-fuel mixture to assist in cold starting.