Automotive Electrical Systems-Part 5-Ignition Systems So far in this series we have covered basic DC electricity theory,then batteries,generators,alternators and starters. Adding those together,we have developed an electrical circuit to get the car started and charge the battery,but now we need a circuit to actually run the car. That,of course,is the ignition system and it is comprised of several parts,comprising two distinct systems,the primary and secondary ignition systems. Let's take each one in order... PRIMARY IGNITION SYSTEM The primary system consists of the ignition switch Launch X431 Solo,coil primary windings,distributor contact points,condensor,ignition resistor,and starter relay. Ignition Switch. Your ignition switch does at least three things: First,it turns on the car's electrical system so that all accessories can be operated. It does so by providing power to the fuse panel (for those components that are controlled by the switch. Some items are independent of the ignition switch,such as headlights,horn,clock,etc.) When you insert the key and turn the switch to the"accessories"position,you are turning on the other devices in the car,such as the radio launch crp129,heater,power windows,seats,defroster,etc. Second,in the run position,everything is turned on,plus the engine's electrical components that enable it to run. Spark plugs are designed with specific heat ranges. That is,the amount of the central insulator/electrode exposed to the heat of combustion. The deeper the electrode/insulator (and the ground piece,of course,extend into the combustion chamber,the"hotter"the plug and the less it extends,the"colder"the plug. Manufacturers specify certain heat ranges for certain conditions,even within the same engine designs. Plugs also come in Types."Type"indicates whether the plug's core is a resistance-type (similar in design to resistance wires) or solid-metal core,projected core nose,and single or multiple ground electrode. Depending upon the engine design,plugs may be specified to require a metal gasket between the shell and the threads. Spark plugs vary tremendously,so it pays to study what your engine requires. Plug manufacturers publish extensive applications manuals that clearly spell out design differences and,most importantly,which plugs will work efficiently in your engine application. Overview How well your engine runs is totally dependent upon how well the primary and secondary ignition system components work,and whether they are matched to your engine.
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