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Odd spark lines

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5 years 8 months ago #23459 by 111Robin
Odd spark lines was created by 111Robin
This is from a 4 cylinder engine from a 1967 Mini Cooper running all original points ignition. The scope is on a 1979 Sun 1115 Performance Analyser. The engine is running perfectly, no misfiring, the only indication of a problem is from the secondary pattern. On three of the four cylinders the spark line isn't a clean vertical line but has strange loops and anomalies. HT leads and plugs are new but the cap is possibly thirty years old. Engine seems to perform well, no missing or other indications of an ignition fault. Any suggestions ?.

[img
VideoCapture_20180922-191433 by Robin Derrick , on Flickr

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5 years 8 months ago #23460 by 111Robin
Replied by 111Robin on topic Odd spark lines
[img
VideoCapture_20180922-191555 by Robin Derrick , on Flickr

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5 years 8 months ago #23461 by 111Robin
Replied by 111Robin on topic Odd spark lines
[img
VideoCapture_20180922-191509 by Robin Derrick , on Flickr

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5 years 8 months ago #23462 by 111Robin
Replied by 111Robin on topic Odd spark lines
Obviously I can just replace the cap however before doing this I'd like to be able to diagnose the possible causes of the odd patterns.

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5 years 8 months ago - 5 years 8 months ago #23463 by 111Robin
Replied by 111Robin on topic Odd spark lines
Link to video

[img
by Robin Derrick , on Flickr
Last edit: 5 years 8 months ago by 111Robin.

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5 years 8 months ago #23469 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Odd spark lines
Looks like a scope artifact, a scope trace can't loop in normal volts against time mode.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)

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