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Distributor

A distributor is a car parts which is used in the ignition system of an internal combustion engine that routes high voltage from the ignition coil to the spark plugs in the correct firing order. The first high-tension distributor was developed around 1904, independently by Napier, Boston, and Winton.

It consists of a rotating arm or rotor inside the distributor cap, on top of the distributor shaft, but insulated from it and the body of the vehicle. The distributor shaft is driven by a gear on the camshaft. The metal part of the rotor contacts the central high voltage cable from the coil via a spring loaded carbon brush. The metal part of the rotor arm passes close to the output contacts which connect via high tension cables to the spark plug of each cylinder. As the rotor spins within the distributor, electrical current is able to jump the small gaps created between the rotor arm and the contacts due to the high voltage created by the ignition coil.

The distributor shaft has a cam that operates the contact breaker. Opening the points causes a high induction voltage in the system's ignition coil.

The distributor also houses the centrifugal advance unit: a set of hinged weights attached to the distributor shaft, that cause the breaker points mounting plate to slightly rotate and advance the spark timing with higher engine rpm. The capacitor is connected parallel to the breaker points, to suppress sparking and prevent wear of the points.

Around the 1970s the primary breaker points were largely replaced with Hall Effect sensors. As this is a non-contacting device and the primary circuit is controlled by solid state electronics, a great amount of maintenance in point adjustment and replacement was eliminated. This also eliminates any problem with breaker follower or cam wear, and by eliminating a side load extends distributor shaft bearing life. The remaining secondary circuit was as described above, using a single coil and a rotary distributor.

Distributor cap

The distributor caps have one post for each cylinder, and in points ignition systems there is a central post for the coil voltage coming into the distributor. In HEI (High Energy Ignition) systems, there is not a central post, and the ignition coil sits on top of the distributor.

A distributor caps are used in an automobile's engine car parts to cover the distributor and its internal rotor.

The distributor caps are prime example of a component that eventually succumbs to heat and vibration. It is a relatively easy and inexpensive part to replace if its bakelite housing does not break or crack first. Carbon deposit accumulation or erosion of its metal terminals may also cause distributor-cap failure.

The "rotor" head is attached to the top of the distributor shaft which is driven by a gear on the engine's camshaft and thus synchronized to it. This rotor is pressed against a carbon brush on the center terminal of the distributor cap which connects to the ignition coil either through the top and wired directly to the coil in HEI systems. The rotor is constructed such that the center tab is electrically connected to its outer edge so that voltage coming in to the center post travels through the carbon point to the outer edge of the rotor. As the camshaft rotates, the rotor spins and its outer edge passes each of the internal plug terminals to fire each spark plug.

Cars that use a mechanical distributor often fail if they run into deep puddles because the water that leaks into the distributor shorts the electric current that should go through the spark plug, rerouting it directly to the body of the vehicle. This, in turn, causes the engine to stop as the fuel is not ignited in the cylinders. This problem can be fixed by opening the distributor's cap and wiping the cam and the contacts dry with tissue paper or by blowing hot air on them.
 

 

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