|Erosion corrosion, Spark Plugs and Determination engine's overall operating condition|
Erosion corrosion arises from a combination of chemical attack and the physical abrasion as a consequence of the fluid motion. Virtually all alloy or metals are susceptible to some type of erosion corrosion as this type of corrosion is very dependent on the fluid. Materials that rely on a passive layer are especially sensitive to erosion corrosion. Once the passive layer has been removed, the bare metal surface is exposed to the corrosive material. If the passive layer can't be regenerated quickly enough, significant damage can be seen. Fluids that contain suspended solids are often times responsible for erosion corrosion.
NGK Spark Plugs
By examining the insulator firing nose colour, an experienced engine tuner can determine a great deal about the engine's overall operating condition. In general, a light tan/gray colour tells that the spark plug is operating at optimum temperature and that the engine is in good condition. Dark coloring, such as heavy black wet or dry deposits can indicate an overly-rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too large a plug gap.
In wet condition, deposits can be an indication of a breached head gasket, poor oil control from ring or valvetrain problems or an extremely rich condition, depending on the nature of the liquid present at the firing tip.
Signs of fouling or excessive heat must be traced quickly to prevent further deterioration of performance and possible engine damage.
Dry and Wet Fouling
Erosion, Corrosion and Oxidation
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