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Chemistry
What breaks down burnt carbon deposits?
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[QUOTE="marcophys, post: 5521886, member: 477913"] Yes, I do accept that... I was lazy in my wording :oops: The need to 'wet' the surface, and provide a detergent due to potential oiliness is important. I have used a butane torch in the past, to burn off any residual oiliness. Which leads to: I had a read up on isopropanol and salt. That was interesting... a bit too interesting :smile: I ended up reading about how it can make water soluble in fuel, and how salt can remove water from it. I did note its effect on non-polar molecules and its ability to dissolve oils. On an abrasive note... I thought perhaps the salt would act as grit, to disrupt the surface. I only had it in its oxidised form - acetone. It certainly left the plug very dry; therefore it could be a useful first stage, if dealing with an oily plug. (and as Tom noted... carburation setup should always be carried out from a rich position) I had a look at Carbon Tetrachloride, and read the safety notes... yes, it doesn't look like a good candidate, when one's nose is two inches away from the electrode :wink: The spark plug sand blaster remains an open topic, all be it apparently closed by the major plug companies. The official line taken is: 'the electrode surface is returned in a non-ideal condition'. Hence garages stopped using them, hence manufacturers stopped making them. However... I once had reason to send a spark plug to NGK for analysis. I received a very detailed report back, and in it, this was explained... but I felt, without conviction. Something along the lines of 'current thinking....' And the technician returned the spark plug back to me 'sandblasted' (lightly he said) :biggrin: Because of this, I am of a mind to think that by getting rid of the spark plug cleaner, they all sell many more spark plugs. But back to the chemistry. Perhaps the best solution is to first degrease the plug and then use the oven cleaner, with a bumped up NaOH content. [/QUOTE]
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What breaks down burnt carbon deposits?
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