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Videos seen on engine combustion would suggest combustion pattern is not an even globe at that kind of flow speeds though.


The thing is, for gapped spark plugs the spark is off-center. The spark actually curves down and outwards, away from the electrodes, towards one corner of the piston. The fact that it produces an additional 3-4hp must mean that combustion is affected. Not sure about the 4 point spark plugs, since those are still at the center it may have no impact.


However I cant prove anything lah, its just a research article I came across by an ex-grassroot racing technician in the US, where all of them do many of these small improvements to squeeze a bit more power. He also showed pictures of his damaged pistons. How true I cant say.


Just food for thought, but if its on a stock N/A engine with normal compression I dont think any of these will be of significance. If youre running an engine like Type-Rs or highly boosted engines though I'd think twice about playing with sparks...


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