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s e r v i c e p a r t s BRISK Premium Spark Plugs BRISK Tábor a.s. offers several types of spark-plugs that can be fitted in most spark-ignition engines. They comply with engine requirements and are designed to be used with prevailing types of operation of motor vehicles and the character of their users. You can choose from either matching equipment or equipment in individual series in our catalogue. At the same time, we also introduce a marking system for BRISK spark-plugs. A spark-plug is a device placed in cylinder heads in internal combustion engines, functioning on the principle of spark-ignition of a mixture of air and fuel. The spark-plug is connected to the cylinder head by means of a thread. The active part protrudes into the engine’s combustion chamber. Its upper part is used to secure a high-voltage supply from the vehicle’s ignition system to the spark gap of the spark-plug. The basic function of a spark-plug is ignition of the air and fuel mixture in the engine’s combustion chamber at a precisely defined time. Springs H Valves H Seals H Bushes H Tools H Performance Upgrades Australia’s most extensive range of Suspension Componentry Terry Hay’s SHOCK TREATMENT Phone: 02 4773 9115 www.shocktreatment.com.au BIKE<strong>Business</strong> 24 January 2009 b u s i n e s s t o b u s i n e s s Unique and Patented Design Higher output, better throttle response and acceleration are achieved through better fuel energy utilization. This in turn also lowers the exhaust emission. Completely New Spark Gap Shape Brisk’s design provides an unrestricted and more spontaneous spread of the flame front which is achieved by: Retracted ground electrode - Unlike conventional spark plugs, where the discharge is constrained by the ground electrode, Brisk Premium Spark Plugs utilize a design where the ground electrode is retracted so the spark discharge occurs at the very tip of the spark plug. The ground electrode design of the traditional spark plug restricts the natural spherical expansion pattern of the flame front. Brisk Premium Spark Plugs utilise surface spark discharge along with retracted ground electrode designed to ensure maximum spark exposure and unrestricted flame front propagation. Utilizing hotter semi-surface spark discharge - It is easier (takes less energy) for a spark to glide along the surface of the insulator than to break through the air gap. Brisk Premium Spark Plugs take advantage of this feature in its design. Almost 2/3 of the spark travel between the electrodes is along the surface of the insulator. The length of the spark discharge is maximized with only a slight increase in the required supplied ignition energy. The higher voltage buildup at the center electrode before the spark-over results in delivering more spark energy into the combustion chamber. However, this spark plug requires a sound ignition system (in good condition) for proper operation.
Utilizing a special ground electrode design - The spark discharge can occur in almost 360 degree perimeter at the place with the most optimal air fuel composition; which is where the ionization of the molecule is most easily achieved. This special feature ensures that the spark occurs at the best possible place for ignition, unlike in the conventional spark plug design where the spark always occurs in the same confined place. Since the air fuel mixture inside the combustion chamber is not homogenous (has different concentration at different places) this results in faster and better ignition of each ignition cycle. In addition, there is no need for indexing of the spark plugs since the plug is symmetrical and there is no ground electrode restricting the access of the air fuel mixture. Spark Gap Deep in Combustion Chamber Shifting the spark gap deeper inside the combustion chamber provides better access of the air fuel mixture to the point of ignition. Since the flame front propagates evenly in all directions the s e r v i c e p a r t s CYLINDER REPAIR AND COATING SERVICE Looking for The Advantage Extreme Power & Reliability best place for ignition is in the center of the combustion chamber. The compact design of the spark gap minimizes turbulence and therefore increases the volumetric flow. Integrated Ground Electrode The massive ground electrode is the integrated part of the spark plug shell which provides superior heat removal from the active part of the spark plug, improving the resistance to pre-ignition and electrode burn-off. Ionization and spark-over occurs automatically together with an optimum composition of the fuel/air mixture. The spark plug gap is not shielded by the side electrode, so the mixture has unlimited access. Better mixture ignition, and thus higher combustion speed, and faster flame front spread, especially at the beginning of combustion, allows better fuel energy utilization. The subsequent increase in medium effective pressure in the engine cylinder and balancing of values of medium effective pressure during individual working cycles contribute to increased engine power. (continued next page) “BIGBORE 125cc to 144cc talk to us NOW” BIKE<strong>Business</strong> 25 January 2009 b u s i n e s s t o b u s i n e s s
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