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s e r v i c i n g Know your spark plugs: carbon fouling Carbon fouling accounts for around 90 per cent of all spark plug troubles. During combustion of the air/fuel mixture, carbon deposits can build up on the firing end of the insulator nose. As these deposits accumulate, a conductive path is formed from the centre electrode, down the insulator nose to where the insulator meets the metal shell. This build-up provides a path for the electrical current to leak through. When voltage is applied, under certain conditions, the carbon path may sink enough current so as to prevent sufficient voltage to build up at the gap, and misfire occurs. This leakage path is shown in in the accompanying diagram. NGK says its spark plug designs incorporate a number of features to combat carbon fouling. Some design examples are the semi-surface discharge, supplementary gap, longer insulator nose, and extended shell. Spark plug anti-fouling design features are requested by engine manufacturers during the design and development of new engines. With standard vehicles, the recommended plug should be used and if fouling is a problem, a check on the engine conditions as outlined below should be made: • Rich fuel mixture • Excessive lubrication oil entering the combustion chamber • Clogged air filter • Weak/deteriorated ignition components • Too cold a spark plug • Over-retarded ignition system • Prolonged low-speed riding or idling The most effective property of a spark plug to prevent fouling is its ability to self-clean. Self-cleaning is the term used to describe the burning of carbon deposits off the insulator nose when the cylinder temperatures rise above approximately should be 450 0 C. Dep ending on the vehicle, self-cleaning will only occur at speeds above approximately 50km/h. During times of prolonged idling and low-speed riding, the engine temperature is relatively low and carbon deposits may start building up on the insulator nose. On the other hand, highway and high-speed riding increase the cylinder temperature enough for the carbon deposits to be burnt away and self-cleaning occurs. For more information contact: NGK Spark Plug (Australia) Pty Ltd 03 9730 4900 visit: www.ngkspark.com.au BIKE<strong>Business</strong> 24 July - August 2012 b u s i n e s s t o b u s i n e s s
Driving Performance www.dayco.com.au www.dayco.co.nz Phone: +61 3 9796 4044 Fax: +61 3 9796 4731
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