<VV> Spark Plug Diagnosis Question

[Tony Underwood]

At 10:36 PM 11/26/2010, Mark Durham wrote:
>Jeff, we'll have to see who responds, but I think #6 might be the
>hottest cylinder of the 6, because it is over the longest exhaust log
>and is also back in a corner. Its also the farthest from the
>carburetor, like #1 and will run a bit leaner. #5 probably also runs a
>bit hotter but not so much that you would notice. Its interesting that
>they put the CHT probe at the other end of the engine where it stands
>to be cooler, in #1. There are guys out there that have installed 6
>cyl chts and could let us know if I am right.



Once upon a time, I saw an engine that had a single hole misbehaving 
like this.    It also acted as if it had a misfire at higher rpm 
under load.


Turned out to be a lump of carbon crud of some sort partially 
blocking an exhaust port, caked up around the guide boss.




tony..