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2. Firing order - Wikipedia

   en.wikipedia.org/wiki/Firing_order

   For this inline-4 engine, 1-3-4-2 could be a valid firing order.. The firing order of an internal combustion engine is the sequence of ignition for the cylinders.. In a spark ignition (e.g. gasoline/petrol) engine, the firing order corresponds to the order in which the spark plugs are operated.

3. Nissan Z engine - Wikipedia

   en.wikipedia.org/wiki/Nissan_Z_engine

   The Z18 debuted in 1977, making it the first model of the Z-type engine to be released. Displacing 1,770 cc (1.8 L) with a bore and stroke of 85 mm × 78 mm (3.35 in × 3.07 in), it is essentially an older L18 type series four-cylinder with a new cross-flow cylinder head and (typically) twin spark plugs.

4. Champion (spark plug) - Wikipedia

   en.wikipedia.org/wiki/Champion_(spark_plug)

   Champion spark plugs ad in 1947. Albert Champion Company was founded by Albert Champion in June 1905 in Boston's South End, in the landmark Cyclorama Building, to import French electrical parts, including Nieuport components. Champion presided as president of the Albert Champion Company with partners Frank D. Stranahan as treasurer and younger ...

5. Spark plug - Wikipedia

   en.wikipedia.org/wiki/Spark_plug

   Spark plug with single side electrode An electric spark on the spark plug. A spark plug (sometimes, in British English, a sparking plug, [1] and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within ...

6. Dual ignition - Wikipedia

   en.wikipedia.org/wiki/Dual_ignition

   A dual ignition system will typically provide that each cylinder has twin spark plugs, and that the engine will have at least two ignition circuits, such as duplicate magnetos or ignition coils. [3] Dual ignition promotes engine efficiency by initiating twin flame fronts, giving faster and more complete burning and thereby increasing power. [4]

7. Wasted spark system - Wikipedia

   en.wikipedia.org/wiki/Wasted_spark_system

   A wasted spark system is a type of ignition system used in some four-stroke cycle internal combustion engines. In a wasted spark system, the spark plugs fire in pairs, with one plug in a cylinder on its compression stroke and the other plug in a cylinder on its exhaust stroke. The extra spark during the exhaust stroke has no effect and is thus ...