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A distributor consists of a rotating arm ('rotor') that is attached to the top of a rotating 'distributor shaft'. The rotor constantly receives high-voltage electricity from an ignition coil via brushes at the centre of the rotor. As the rotor spins, its tip passes close to (but does not touch) the output contacts for each cylinder.
Duraspark II distributor, cap and HT (high tension) wires. The Duraspark II is a Ford electronic ignition system. Ford Motor Company began using electronic ignitions in 1973 with the Duraspark electronic ignition system and introduced the Duraspark II system in 1976. The biggest change, apart from the control box redesign, was the large ...
A wider spacing was also needed between the cap, inserts and the distributor housing to prevent arc-over and leakage to ground. The higher voltage output of the HEI system required new insulation materials. To prevent ignition failure due to carbon tracking, a special material is used for the distributor cap and rotor.
The distributor rotor turns in time with the camshaft. When it is time for a spark plug to fire, the rotor (the blue bar shown in the distributor in the figure above) connects the center electrode of the distributor cap to an electrode connected to a spark plug wire. This occurs simultaneously with the points opening and the coil delivering a ...
The DC-CDI module is powered by the battery, and therefore an additional DC/AC inverter circuit is included in the CDI module to raise the 12 V DC to 400-600 V DC, making the CDI module slightly larger. However, vehicles that use DC-CDI systems have more precise ignition timing and the engine can be started more easily when cold.
It was its own separate engine design, based on a single block casting, [19] which had four exhaust manifolds, two carburetors and intake manifolds, and two distributor caps driven by a single distributor drive, [19] plus other parts from the 351 V6. A total of 56 major parts are interchangeable between the Twin-Six and the other GMC V6 engines ...
Carquest was the official auto parts supplier of Hendrick Motorsports until the end of the 2011 season. Kellogg's and Carquest announced on May 26, 2006 a unique three-year agreement with Hendrick Motorsports that made the two companies co-primary sponsors of the No. 5 Chevrolets driven by Kyle Busch in the NASCAR Sprint Cup Series. [16]
The 1975 high energy ignition (HEI) provided spark to the spark plugs with minimal maintenance and increased power. The larger distributor cap also provided better high-RPM performance by decreasing the likelihood of the spark conducting to the wrong terminal. The 250-cubic-inch in-line six of 105 hp (78 kW) was offered as the base engine.