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Old 05-28-2005, 01:46 PM
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Cylinder pressure vs. spark plug gap

Does increaded cylinder pressure require a smaller spark plug gap?

If you add a supercharger to an engine (8 psi boost w/ intercoller) should the plug gaps be smaller?

If you go from 8.5:1 cr to 10:1 cr, does that require a smaller gap?

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Old 05-28-2005, 02:36 PM
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Generally speaking, Yes, Yes, Yes.
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Old 05-28-2005, 03:39 PM
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yes, because higher cyl pressure means more resistance to the spark to jump the gap, the wider the gap and the higher the cyl pressure the less spark duration. there is only a given amount of voltage that makes it to the plug, most of it is used to jump the gap and the rest discharges right after. the same thing goes with a lean mixture... the leaner the mixture the less area the spark can travel across.
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Old 05-28-2005, 09:25 PM
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aftermarket ignition

MSD recommends increasing spark plug gap up to .050 for their ignitions.
I know some guys who cut the angled piece of the plug in their race cars and let the plug ground on whatever it wants to.
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