Carbon buildup completing the circuit on spark ignitors - no spark
Carbon buildup completing the circuit on spark ignitors - no spark
(OP)
We have spark ignitors that are inserted into a spray of #2 fuel oil and a very turbulent area... the spark ignitors are getting a build-up of carbon on them that is thick enough to complete the circuit so the current travels through the center electrode, through the wet carbon buildup, and back through the outside of the rod --> therefore no spark... This happens after being run for an hour or so
We have pulled the spark rods back slightly to hopefully remove them from being directly in the spray as we think this may have been what was happening... but not for sure
Has anyone ever had this problem of excessive carbon buildup? if so, how did you resolve it? Thank you.
We have pulled the spark rods back slightly to hopefully remove them from being directly in the spray as we think this may have been what was happening... but not for sure
Has anyone ever had this problem of excessive carbon buildup? if so, how did you resolve it? Thank you.





RE: Carbon buildup completing the circuit on spark ignitors - no spark
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RE: Carbon buildup completing the circuit on spark ignitors - no spark
RE: Carbon buildup completing the circuit on spark ignitors - no spark
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Carbon buildup completing the circuit on spark ignitors - no spark
It isn't clear how the position of 16 igniters could change at once, though, so what else has changed over time, as IRStuff alludes to. Is the combustion air flow diminished? Clogged inlet filter?
RE: Carbon buildup completing the circuit on spark ignitors - no spark
If you are sure that the deposits are come from carbon (you can understand them from the color, they must be black) then you have wrong AFR. In case AFR is not correct the exhaust gas temperature is also wrong and if you look the exhaust gases they must be black (when you have new spark plugs).
If your smoke is like very dark blue then you have to check if oil comes into the compastion area.
Also check if the spark plugs that you use are in the correct heat range. The manufacture of the engine can answer this.
To be 100% sure, as IRstuff wrote, a chemical analysis would be useful.
RE: Carbon buildup completing the circuit on spark ignitors - no spark