Posted by Janicholson on April 25, 2020 at 07:15:21 from (24.240.46.228):
In Reply to: confused over coils posted by Charlie M on April 25, 2020 at 06:32:57:
Many car companies determined that the starting process in cold weather (Detroit) was a problem. The starter could draw enough current that the system voltage might drop to 4.5 volts. The coil was only given that amount, causing weak spark. The solution was to use a coil that was designed for 3.5 volts or so giving the starting process a good chance. This starting voltage was delivered to the coil from a connection direct to the starting circuit. this is only supplied when the starter is turning the engine. (several methods are used to do this "bypass" circuit) When cranking results in a start, the bypass voltage is shut off. The ignition circuit through the switch has been on all this time, but it runs through a resistor dropping its voltage to the 4.5 or so volts for the coil. Remember that the running voltage of the system is a bit over 7 volts, charging the battery. This keeps the coil happy, and allows cold starts to be much more successful. Jim
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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