Quote:
Originally Posted by fanamingo
Bumping an old thread, but I'm curious about the theory behind the spark plug orientation. If they all face the same way, this should allow a more identical burn between cylinders, right? But what's the reason for having them face the exhaust valves?
Honda was nice enough to post a video of the R18 engine found in 2006+ Civics. You get a nice view of the spark plugs from about 0:43-0:45. The plug gaps are all facing the intake valves. Maybe this is just a marketing video, and I shouldn't read too much into the plug orientation?
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It has to do with flame kernel propagation. There's an ideal positioning of the ground electrode in terms of optimum combustion efficiency.