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mrsummitville
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BOB S had posted this in a now closed thread:
https://www.physicsforums.com/showthread.php?t=360072
Regarding this analysis ...
https://www.physicsforums.com/attachment.php?attachmentid=20126&d=1250393723
My questions ...
Q1) Does this oscillation from the L-C circuit actually cause several (+/-/+/-) sparks on the spark plug each time the peak voltage on the secondary exceeds the break-over voltage?
Q2) How quickly does the loading from the spark plug via the secondary dampen out that oscillation in the real world?
Q3) So, how many "sparks" are there in one compression cycle?
https://www.physicsforums.com/showthread.php?t=360072
When the points close, the capacitor is shorted and the coil primary charges up to about 2 amps (limited by coil internal resistance of ~6 ohms). When the points open, there is a very large V = L dI/dt voltage, ~300 volts, across the capacitor that resonates back and forth with current in the coil, for ~ 10 cycles. The coil secondary:primary turns ratio is ~100:1 so the coil secondary voltage is ~30,000 volts. See my LTSPICE simulation
https://www.physicsforums.com/attachm...6&d=1250393723
The points close at 0 and 4 milliseconds, and they open at 2 and 6 milliseconds.
Regarding this analysis ...
https://www.physicsforums.com/attachment.php?attachmentid=20126&d=1250393723
My questions ...
Q1) Does this oscillation from the L-C circuit actually cause several (+/-/+/-) sparks on the spark plug each time the peak voltage on the secondary exceeds the break-over voltage?
Q2) How quickly does the loading from the spark plug via the secondary dampen out that oscillation in the real world?
Q3) So, how many "sparks" are there in one compression cycle?
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