Discussion Overview
The discussion revolves around the ignition voltage required to initiate a spark in a waste spark ignition system, specifically in the context of an old 2-cylinder Citroën 2CV. Participants explore the factors influencing ignition voltage, the behavior of dual output ignition coils, and the relationship between the two spark plugs in the system.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Conceptual clarification
Main Points Raised
- One participant notes that the ignition voltage depends on various factors, including the dielectric in the plug gap and the pressure in the combustion chamber.
- Another participant questions whether the two outputs from the dual ignition coil are independent and suggests checking the resistance between the high-tension leads.
- A participant describes the dual output ignition coil as having reversed polarity outputs and a transformer ratio of approximately 1:100, indicating both high-voltage sections are connected in series.
- It is proposed that both spark plugs must fire together since they are in series, which may explain the ability to achieve sufficient voltage for both plugs despite differing conditions.
- One participant expresses confusion about the necessity of both plugs firing for one to spark, suggesting that the current may only be present in the ionized gap of the spark plug and not in the cables.
- Another participant argues that there must be current flowing through the spark plug gap for a spark to occur, challenging the idea that no current exists in the spark cables during sparking.
- A participant describes an experiment using a graphite pencil to test spark polarity, noting differences in spark appearance based on polarity.
- There is a discussion about the nature of the spark and the conditions under which it occurs, with some participants suggesting that the spark can ignite fuel regardless of polarity.
Areas of Agreement / Disagreement
Participants express differing views on the behavior of the ignition system, particularly regarding the independence of the spark plugs and the nature of current flow in the system. The discussion remains unresolved, with multiple competing perspectives on the mechanics of the waste spark system.
Contextual Notes
Participants acknowledge the complexity of the ignition system and the various factors that influence spark generation, including dielectric conditions and the behavior of the ignition coil. There are references to specific measurements and experiments that may not be universally applicable.