B S Mechanical

This animation also illustrates a simple ignition system using breaker points, coil, condenser, and battery. A number of visitors have written to point out a problem with the breaker points in my illustration. In this style ignition circuit, the spark plug will fire just as the breaker points open. The illustration appears to have this backwards. In fact, the illustration is correct; it just moves so fast it?s difficult to see! Here?s a close-up of the frames just at the point the plug fires: breaker point closeup My original intent was to accurately show that the points need to remain closed for only a fraction of a second, called the dwell. By illustrating this, I inadvertently obscured the overall operation of the circuit. Perhaps someday I?ll prepare a more detailed illustration of the ignition system alone. Larger four stroke engines usually include more than one cylinder, have various arrangements for the camshaft (dual, overhead, etc.), sometimes feature fuel injection, turbochargers, multiple valves, etc. None of these enhancements changes the basic operation of the engine.

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