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Re: Spark Plug Gapping... 900 1992

posted by  someone claiming to be Uel on  Thu Nov 8 03:27 CST 2001 [RELATED]

Depends upon the condition of your ignition system. If its A1 then there would be no noticeable difference. However, if it was down on power (especially the points type ignition systems) then the bigger gap *could* cause a misfire - the voltage required to produce a spark that jumps across the plug electrodes increases as the pressure around it increases.

A large fat spark is required to ignite as much fuel/air mixture as possible, but if the gap is too large, then the spark will fail, so you'll end up with no ignition, hence the misfire.

Most modern electronic ignition systems don't suffer as much, hence .7-.8 is fine. It'd probably run at .9 as well, but may degrade under load.

Hope this makes sense :)

Uel





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