6 replies to this topic

[pete-r]

Morning all I've had a search and not got a single answer so figured I'd ask again. What's the correct gap for new plugs? Eurocarparts and NGK websites list the car as needing a 0.9mm gap, but threads on here talk of 0.8, 0.7 etc. Car is an SC. Anyone able to advise?

[Nev]

The gap will depend on the dynamic compression in your cylinders, the more compression the smaller the gap required in general. This is because when the charge in the cylider is compressed it is harder for the spark to jump the gap. Most mid boosted cars use around 0.6 to 0.8 mm gap.

 

If you are getting hesitation/misfiring when booting it then try reducing the gap down a bit. Use feeler gauges to measure.

 

HTH

[pete-r]

I've gapped them all to 0.9 already but want sure whether to adjust further. I'll check the plugs coming out too. These are one step colder would that make a difference? The new plugs were all over the place, 2x1.1, 1.0 and a 1.2 but advertised as 1.1.

[CHILL Gone DUTCH]

Keep them there Pete and try them

[pete-r]

I'll try running them for a while and see. If the gaps were wrong would I know right away? I fired the car up and it idled fine but put it through its paces.

[Nev]

Drive the car hard, only reduce the gap if it's not firing correctly when under heavy load.

[siztenboots]

I gap mine at 25 thou