What Is Glow Plugs
The glow plugs and spark plugs there are devices used to ignite the fuel in small combustion engines used in some model aircraft and model cars. The ignition is performed through resilient, generally platinum, spiral wire filament buried in the tip of the plug. The time when the electricity runs through the stopper or is the time to warm up the combustion chamber, the glow plugs enable igniting the fuel being used by the engine. The supplied voltage after start-up may be higher. The voltage supplied by the car batteries can be also different for the glow plugs depending on the conditions of the battery and the cables, and can also be determined by control system that will reduce the value.
How Glow Fuel Work
The glow fuel generally is made up of percentage methanol having changeable levels of nithromethane substance as oxidizer intender for superior power normally between five to thirty percent of the entire blend. For example 15% glow fuel blend contains about 15 % nitro. When the fuel gets in touch with the warm substance of the spark plug, ignition will occur. The electric wire stays hot, between rubs of the engine and continues to glow partially because of the terminal sluggishness, but mostly because of the catalytic ignition response of methanol which remains in the platinum thread. This maintains the warmth of the filament, permitting the ignition of the next charge, hence supporting the power series. If the nitro content is high, more the fuel is expensive, the greater the power and performance of car in most cases.
Several engines of aircraft are designed in order to operate on fuel without nitromethane content at all. Technically a model engine is somewhat comparable to diesel engines and hot bulb engines since it utilizes internal heat in the ignition of the fuel, but because the combustion timing is not restricted through fuel injection ( like in usual diesel engine ), or by means of electrical power (like in spark combustion engine), it should be attuned by change of fuel/air mixture as well as coil/plug design normally through the adjustment of several inlets and also controls in the engine.
A richer combination will have the tendency to chill the filament to delay the ignition which will cause the slowing down of the engine. This design can be adjusted also by the use of various plug designs for additional exact heat control. The flush plug engines resemble mostly the hot bulb engines since the ignition of both types occur because of the “hot spot” inside the combustion chamber of the engine.
These engines may be designed in two-cycle process (ignition each rotation) or four-cycle process (ignition in every 2 rotations). The two-stroke model produces extra power; however, the four-stroke engines possess more low-end rotation, less noisy and have lower pitched and more sensible sound.
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