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The '''firing order''' is the sequence of sparking of the [[spark plug]]s in a [[reciprocating engine]], or the sequence of fuel injection in In a [[straight engine]] the spark plugs (and [[cylinder (engine)|cylinder]]s) are numbered, starting with #1, from

The '''[[Alfa Romeo]] Twin Spark (TS)''' technology was originally developed by Alfa in the early 1960s in t ==The 'Twin Spark'==

...specific diameter instead of flat blades is used to set the gap in [[spark plugs]] to the correct size; this is done by increasing or decreasing the gap unt

|Successor || [[Alfa Romeo Twin Spark engine|Alfa Romeo TwinSpark]] ...[[Fiat]] designed [[engine block]], please refer to the [[Alfa Romeo Twin Spark engine]] page.

...in a controlled manner. This type of arrangement was quickly superseded by spark ignition, a system which is generally used to this day, albeit with sparks ...heat on each stroke due to the heat generated on the previous stroke. Glow plugs are also used to aid starting of diesel engines.

...of the plug, a [[spark gap]] inside the cylinder. Early patents for spark plugs included those by [[Nikola Tesla]] (in US patent 609,250 ...ngines can be divided into ''spark-ignition engines'', which require spark plugs to begin combustion, and ''compression-ignition engines'' ([[diesel engines

===Fuel and spark plugs=== ...]]s with a 54 to 55 heat index were required. Several teams used Champion spark plug QA55V.

...urs when [[petrol|fuel]] in the cylinder is ignited by the firing of the [[spark plug]] and smooth burning proceeds but some of the unburned mixture in the * Retardation of [[spark plug]] [[ignition system|ignition]].

...combustion chamber]] and the location of the [[poppet valve|valve]]s and [[spark plug]]s. In a [[flathead engine]], the mechanical parts of the valve train

*mechanical [[Magneti-Marelli]] ignition, dual spark plugs and dual fuel pump

...amber as opposed to two for the Wankel. However it also requires six spark plugs, one per combustion chamber, as opposed to one per rotor for the Wankel (al ...ential. In common with the Wankel, the Quasiturbine only requires a single spark plug. A prototype of the Quasiturbine AC design was constructed and turned

...rgy from the expansion. [[Diesel]] engines are [[adiabatic]] and have no [[spark plug]]s and use energy transferred to air charge during compression to dire

| Spark plugs | Spark plug wires

Spark Plugs:

components (spark plugs and accumulators), as well as [[moped]]s and [[motorcycle]]s. It was part

...der head]] design). However, this did offer excellent access to the spark plugs.

...bore spacing, paving the way for future displacement increases. The spark plugs were moved and a new water pump was used. The dynamo on the prior versions

...] that featured [[SPICA]] fuel injection, four ignition coils and 16 spark plugs. The engine used four chain-driven camshafts to operate the valve train and

...epower, improvements to the cast iron head and the relocation of the spark plugs, intake manifold and exhaust improved mid-range performance. In addition, t

...he engines was difficult - they had to be removed in order to change the [[spark plug]]s - and the high [[Fuel efficiency|fuel consumption]] engine required

...amber as opposed to two for the Wankel. However it also requires six spark plugs, one per combustion chamber, as opposed to one per rotor for the Wankel (al ...ential. In common with the Wankel, the Quasiturbine only requires a single spark plug. A prototype of the Quasiturbine AC design was constructed and turned

*[[Spark Plugs]]: [[NGK]]

*mechanical [[Magneti-Marelli]] ignition, dual spark plugs and dual fuelpump

...he engines was difficult - they had to be removed in order to change the [[spark plug]]s - and the high [[Fuel efficiency|fuel consumption]] engine required

...by nearby Ducati Elettrotecnica, but was initially unreliable. Dual spark plugs were used, and the final ignition system used four coils, two on each side

...other, as well as affecting manifold vacuum which affects [[distributor]] spark advance which in turn affects idle speed, so that adjusting the idle to opt ...too rich mixture, [[white]] to light [[gray (color)|gray]] deposits on the plugs indicate a lean mixture. The correct color should be a [[brown]]ish gray.

...ic air), rather than a separate source of ignition [[energy]] (such as a [[spark plug]]), as is the case in the [[gasoline engine]]. ...by the rising [[piston]] at a much higher [[compression ratio]] than for a spark-ignition engine, up to 25:1. The air temperature reaches 700–900 [[C

...by nearby Ducati Elettrotecnica, but was initially unreliable. Dual spark plugs were used, and the final ignition system used four coils, two on each side ...-Twin, based on Ducati's existing liquid and air-cooled engines, with twin-spark plug heads, pressure fed plain camshaft bearings, redesigned crankshaft, hi

The base 164 engine was the 2.0 L Twin Spark with two [[spark plugs]] per cylinder. The block of the Twin Spark was the illustrious 2.0 L that had been a part of Alfa's road

* [[Reading spark plugs for racing]]

* [[Reading spark plugs for racing]]

...el injection]]. Competition models featured cylinder heads with twin spark plugs. Common to all models was also a 5-speed [[manual transmission]] and disc b ...750 GTV. Once again the engine had a special cylinder head with twin spark plugs, but this time the head was to a new design departing significantly from th

* [[Reading spark plugs for racing]]

...head camshafts, two fuel-injection systems, four distributors and 16 spark plugs. With eight camshafts, four-valves per-cylinder (64 valvs), and a 9.3:1 com

* [[Reading spark plugs for racing]]

* [[Reading spark plugs for racing]]

...lt) clean, use high-quality lubricants and fuel with precisely-tuned spark plugs, air / fuel mixture, and timing. This is obvious, but often neglected.

...onstruction, [[hemi|hemispherical combustion chambers]], centrally-located plugs, two rows of overhead valves per cylinder bank and dual overhead cams. Jano |1992–present ||[[Alfa Romeo Twin Spark engine|TwinSpark]]||1.4, 1.6, 1.7, 1.8, 2.0

...d seat, 1100 cc air-cooled V-twin, imported from the Breva 1100, twin spark cylinder heads, 74 hp at 6400 rpm and 94 Nm of torque at 5000&nbs ...redesigned intake and exhaust ports, an all-new exhaust system, twin spark plugs, lighter pistons and lightweight rods, revised oil system, alternator mount