Spark plugs with supplementary spark gap

The NKG Spark plug with supplementary Spark gap developed for VW and Audi.

Maximum ignition reliability for smooth engine running and optimum protection of catalytic converter.

"Carbonised" plug faces are a problem of the past. Long-life spark plugs with self-cleaning features are standard today.

The particular feature of the "intelligent" spark plugs with supplementary spark gap, developed specially by NGK for VW and Audi, is that they always "know" where to flash.

In normal condition the ignition spark flashes from the center electrode to the ground electrode and enflames the fuel-air mixture (1).

If due to intense fouling the ignition spark cannot flash, the ignition voltage would normally escape unutilised via the insulator, which has become conductive because of the carbon deposit, and the fuel-air mixture, aspirated by the piston, is ejected unburnt with the next stroke via the exhaust valves. Last but not least, this also entails risks for the catalytic converter.

But this is prevented in a simple manner by NGK spark plugs with supplementary spark gap. Here, the ignition voltage first escapes in the case of pronounced carbon deposition via the insulator tip, but then flashes, while forming an ignition spark, at a point where the spark plug shell is drawn near the insulator tip (2). The result: The fuel-air mixture is properly inflamed, the engine starts immediately. After reaching the self-cleaning temperature of the insulator tip at approx. 350° C, the soot-like deposits are removed and ignition takes place again in the "normal" manner, between center and ground electrode.

Ensuring proper functioning of the spark plugs - also in adverse conditions - is one of the particular characteristics of NGK spark plugs. They prove to be not only extremely friendly to the environment, but also of advantage for fuel consumption. By preventing misfiring the petrol is used optimally. To the benefit of the customer's purse and that of the environment.