What is carbon deposit removal?
Carbon deposit removal strips the hard, baked carbonised film that forms on pistons, valves, exhaust components and heat-exchange surfaces. Ordinary degreasers cannot touch it — carbon is not oil and does not emulsify — so it needs a heated, high-alkalinity soak with long dwell.
Also called: decarbonising, carbon removal
Carbon is what remains after oil has been thermally decomposed. It is chemically inert, mechanically hard, and firmly bonded — which is why a bath that removes machining oil in four minutes will do nothing to it in an hour.
The working approach is a hot, strongly alkaline soak with extended dwell, typically measured in hours rather than minutes, often with agitation. The chemistry attacks the binder holding the deposit rather than the carbon itself, undercutting it so it lifts.
Substrate compatibility is the constraint. The alkalinity needed will attack aluminium pistons and zinc components, so mixed assemblies must be separated or a lower-alkalinity, longer-dwell route accepted.
