Power-Plant Test
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| A. The magneto is put on a test stand and rotated at a specified speed. The breaker points are held open and the primary current is measured. The strength of the magnet determines the amount of primary current.B. The ignition switch is not grounding the magneto primary circuit.
C. The capacitor minimizes arcing at the breaker points, and it speeds up the collapse of the primary current as the breaker points open.
D. A round wire gage.
E. High-intensity, intermittent-duty, capacitor discharge ignition systems.
F. Special cam used in magnetos mounted on high-performance radial engines. The cam has one lobe for each cylinder, are ground that the points open when the pistons in the different cylinders are the same linear distance from top center.G. When the engine is being started, the impulse coupling holds the rotating magnet until the piston passes over its top center position and starts down. The impulse coupling releases the magnet and the spring spins, it produces a hot and late spark.
H. In the Both position.
I. A magneto has its own source of electrical energy, and it is not dependent upon the battery.
J. Spark plugs tell a good deal about the internal condition of the cylinders from which they were taken. The mechanic can take the proper action when a spark plug indicates such conditions as detonation or overheating.K. The length of the threads on the spark plug that screw into the cylinder head.
L. Pressurized air is a better insulator than less dense air. By pressurizing the distributors, the high voltage is kept from arcing across to the wrong electrode and causing vibration and loss of engine power.
M. A shielded spark plug that has a recess in the shielding in which a resilient grommet on the ignition lead forms a watertight seal.
N. The E-gap angle is the position of the rotating magnet when the primary current flowing in the magneto coil is the greatest. The breaker points open when the rotating magnet is in its E-gap position.
O. Low-tension magnetos are used on aircraft that fly at high altitudes where there is a problem with flashover in the high-tension magneto distributor.
P. A torque pressure switch energizes the system when the engine stops producing torque.
Q. If the spark plugs are not put in tight enough, there is the possibility of a poor seal, and if they are put in too tight, there is danger of cracking the insulation.
R. A hot spark plug has a long path for the heat to travel between the nose core insulator and the spark plug shell. In a cold spark plug, the heat has a shorter distance to travel, and the spark plug operates cooler than a hot spark plug.
S. The low-tension ignition system has only one coil in the magneto, and it uses a carbon-brush-type distributor. Low voltage is distributed to high-tension transformers that are located on the heads of each cylinder. T. Fine-wire spark plugs have a firing end that is more open than that of a massive electrode spark plug. The open firing end allows the gases that contain lead to be purged from the spark plug so they will not form solid lead contaminates.
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