L John
Senior Member
- Joined
- Nov 24, 2013
- Messages
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- Location
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- Your Mercedes
- W204 C350 Petrol Elegance
Retarding the ignition. The number of plugs has no bearing on the way the timing is controlled.
Nothing to do with ignition timing.
The spark pugs are both energised at exactly the same time in the same cylinder.
Two spark plugs cause two points of ignition in the same cylinder, the flame front will meet at the mid point between the spark of the plugs and cause knock.
My guess is they must be close enough together to minimise the potential knock problem but I'm just guessing as I don't know the answer.