fv1609 Posted May 13, 2014 Author Share Posted May 13, 2014 A friend brought this plug that had seen very little use but was failing to function. I applied 5Kv to it but no sparking so as it was coated with carbon I cleaned it with abrasive grit. Abrasive cleaning should be done for the minimum time so as not to damage the insulator but even so has the effect smoothing the electrodes making it a little more difficult for the spark to jump. So really the electrodes should be filed to restore them to a flat sharp edged profile. Cleaned with meths & re-gapped. I didn't bother with that as I felt 5Kv should find its way across the gap anyway. But I could not get a spark. I measured the internal through resistance of the centre electrode & this was quite normal at 1.5 k ohms. There was no measurable resistance from the centre electrode to the outer until I got above 1 Kv (something that would not be revealed using a multimeter). But still no spark although I could hear a weak buzzing noise from the plug. I dismantled the plug & was disappointed to see that the grit blasting had not reached the deeper recesses of the insulator. However this should not matter too much, but in this instance it did. Because blasting the extracted insulator showed the circumferential crack that was allowing a spark through. So it seems the only way to test a plug out of the engine is to apply at least 5 Kv & see if there is a spark. So if anybody wants any plugs tested it is a very simple matter & I will be happy to test any at the various shows which so far are: Overlord Evesham W&P GDSF Quote Link to comment Share on other sites More sharing options...
andym Posted May 13, 2014 Share Posted May 13, 2014 That damage is typical of misuse when adjusting the gap, the central electrode doesn't usually take kindly to bending. Andy Quote Link to comment Share on other sites More sharing options...
Ian-K Posted May 30, 2014 Share Posted May 30, 2014 That was a very interesting thread. I hadnt realised the plug could be stripped down like that. Thanks Quote Link to comment Share on other sites More sharing options...
fv1609 Posted May 30, 2014 Author Share Posted May 30, 2014 Ian it takes a bit of determination as there is hollow copper ring that is crushed onto the insulator body & this makes it very hard to undo! Quote Link to comment Share on other sites More sharing options...
military ni Posted June 9, 2014 Share Posted June 9, 2014 Hi clive. Rsn13p part of. How are you . Wilson Quote Link to comment Share on other sites More sharing options...
fv1609 Posted June 10, 2014 Author Share Posted June 10, 2014 Hi clive. Rsn13p part of. How are you . Wilson Hello Wilson nice to see you around. The pictures are of the same plug which is actually a RSN12Y. Quote Link to comment Share on other sites More sharing options...
military ni Posted July 10, 2014 Share Posted July 10, 2014 tought you might to see my new toys wilson Quote Link to comment Share on other sites More sharing options...
fv1609 Posted July 11, 2014 Author Share Posted July 11, 2014 At the last count I think you had 8 Pigs Wilson, how many is it now? Quote Link to comment Share on other sites More sharing options...
Rover8FFR Posted July 11, 2014 Share Posted July 11, 2014 At the last count I think you had 8 Pigs Wilson, how many is it now? OMG! :wow: Quote Link to comment Share on other sites More sharing options...
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