Quote:
Originally Posted by nkaminar
It is interesting that there is more carbon buildup on the #1 and #4 cylinders. I wonder if it had to due with the plug placement.
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The nature of the flame front is going to be different in 1/4 vs 2/3, which means that it's impossible to optimize your timing. Half the cylinders will always have slightly incorrect timing, so it's not surprising to see carbon buildup in half of them.
Scalded Dog did
their dual-plug head as shown below, with the aid of computers and a lot of testing, so you can imagine that a design with both plugs located at the same edge of the combustion chamber might not be the optimal arrangement.