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What breaks down burnt carbon deposits?
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[QUOTE="marcophys, post: 5527396, member: 477913"] I know Tom... I've also been wondering about that. The thing is... when I did the 'upright' test... there was no aluminium content, yet it still fizzed up to create the gel. However, the gel stained the ceramic OR the ceramic stain was simply not removed. This leads us to the potential re-deposition of carbon. It perhaps brings us back to Boreks original response: The tests continue... but in context : [B][SIZE=5] 1st phase testing[/SIZE] Foreword[/B] After phase 1 tests, the results show the impact of NaOH + NaCl + H2O when applied to spark plug electrodes. [B]The results can be summarised:[/B] Combustion deposits are broken down, and can be removed by brush agitation with water. Where excessive deposits existed, either the ceramic insulator was stained, or the original stain was not removed. However, the surface presence of 'combustion deposits' were removed... the plug became cleaned, but for the ceramic staining (IE. it was not white). [B] Notes:[/B] Anybody wishing to repeat these tests... I would recommend a careful choice of plugs. 4 stroke plugs meet with little oil during combustion. The ceramic begins life 'white'... the remaining stain after cleaning is shown [URL='https://drive.google.com/file/d/0B9HHPLN8L5MxeVY2NTd3Y2xTZlk/view?usp=sharing'][B]here[/B][/URL] 2 stroke plugs do meet with oil during combustion AND that oil can be of coloured synthetic type. This oil 'paints' the plug, making 'combustion colour identification' extremely difficult. [URL='https://drive.google.com/file/d/0B9HHPLN8L5MxM1JjeUxTSklLMEk/view?usp=sharing'][B]Here can be seen a B9ES run with 'blue' (literally) 2T oil, after cleaning.[/B][/URL] The plug is clean of all deposits, but the ceramic is far from white. There are two questions that arise from this: [LIST=1] [*]Can the engine combustion finish the job, and either clean the plug, OR, deposit a new layer IE. Has the chemical cleaning done it's job? [*]Must the search continue, to return the ceramic insulator to a white condition? [/LIST] The answer to point 1... baseline tests have been completed - the comparative tests will be done tomorrow. [B]Point 2... the tests continue.[/B] Thinking of Boreks comment, I mixed dishwashing liquid with the water, before adding NaOH + NaCl + Al What was utterly remarkable was that no odour was emitted. Normally, you can't approach the tub, due to the vapours. Add a touch of dishwashing liquid, and all you can smell is soap. A really strong smell of soap like Savon de Marseilles. I approached the tub with my nose very carefully, until it was right in the tub... and nothing. I washed the mix down the sink, and started again. I couldn't get near the tub. Added a small squeeze of detergent... mixed it in... and no vapour. Did I just screw the chemical reaction, or have I fallen upon a nice safety feature? Anyway, I'm leaving a stained plug in the bath overnight. Tomorrow I'll try the oven cleaner, added with NaOH + NaCl + Al. The reason being that we know the oven cleaner has a correct detergent formula, and yet perhaps it requires an increase in the active ingredients. Tomorrow should be interesting on all fronts. [/QUOTE]
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