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12-04-2020, 05:22 PM | #16 |
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Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
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Like Mr Gazza, I'm no expert in this field and agree that any information from the manufacturers themselves may not be wholly subjective as they have a vested interest and want you to buy their products.
For what it's worth, this diagram and explanation is from the Denso website. https://www.denso.com/global/en/prod...condition.html "The smaller the electrode the more concentrated the electric potential at the tip of the electrode and the stronger the electric field that affects required voltage and the lower the required voltage." Although this information comes from a plug manufacture, I do believe that electrode size and shape does affect spark generation and Denso's diagram appears to be backed up by independent research. https://docs.lib.purdue.edu/cgi/view..._access_theses This is not specifically about spark plugs but it does show how different electrode shapes affect the voltage needed to create a spark across any given gap and I don't see why the findings shouldn't also be relevant to spark plug design. |
12-04-2020, 06:06 PM | #17 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,814
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Studying all at makes me feel I know even less!
So any theories on how the shirt buttons work? I've always wondered.
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12-04-2020, 06:32 PM | #18 |
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13-04-2020, 06:25 AM | #19 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
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Is it some crude sort of capacitor maybe?
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13-04-2020, 07:21 AM | #20 |
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Gary,
In days gone by, you could buy a commercial Spark Booster which was simply an enclosed spark gap external to the motor. The theory appeared to be that once the voltage had built up enough to jump this significant gap, it would make small work of the plug gap itself! At the very least you'd imagine this would entail a slight delay of the spark, if not provoke breakdown of the insulation elsewhere. This is likely what your old-timer was doing. I never tried it myself cos it looked more like snake-oil! Nick |
13-04-2020, 07:23 AM | #21 |
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If you now google Spark Booster, all you get is ads for some sort of electronic guitar enhancement!
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13-04-2020, 09:04 AM | #22 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,814
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Thanks Nick. I do vaguely remember Spark Boosters. I think they had a clear cylinder in the middle so you could see the extra spark?
If the shirt button works as you say then a little retardation probably wouldn't hurt a big slow revving over loaded lorry. Can't help wondering about how a bonnet full of naked sparks went with an equally dilapidated fuel system??!
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