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Spark plug gap

Practical Engine Building

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Hello guys I am running 1.1bar of boost on my M50. Going for a new spark plugs and I will set the gap to 0.55mm is that ok?

Thank you.

It's a little on the tight side, for that boost level, IMO, but try it and see how it works out. If there's a problem it will usually show as a light mis-fire under light load and "lean" spikes in the lambda and, if that happens, open them up a tenth and see it that helps.

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