Interests ::

    Spark Plugs - Technical Info & Charts- BMW R51/3


    Sparkplug / Kerzen :: Bosh

    Spark plugs can be considered as one of the the most important components of the engine. Spark plugs are the only eyewitness to the combustion chamber of the engine and can be used as a valuable diagnostic tool. The spark plug displays symptoms and conditions of the engine's performance. The experienced tuner can analyze these symptoms to track down the root cause of many problems, or to determine air/fuel ratios.

    Purpose

    The main functions of the spark plugs are to ignite the air/fuel mixture, and to remove heat from the engine's combustion chamber.

    Drawing :: [>>]

    Operation

    A spark plug is a device, inserted into the combustion chamber of an engine, containing a side electrode and insulated center electrode spaced to provide a gap for firing an electrical spark to ignite air-fuel mixtures.

    The high-voltage burst from the coil via the distributor is received at the spark plug's terminal and conducted down a center electrode protected by a porcelain insulator. At the bottom of the plug, which projects into the cylinder, the voltage must be powerful enough to jump a gap between the center and side electrodes through a thick atmosphere of fuel mixture. When the spark bridges the gap, it ignites the fuel in the cylinder.

    Basics of spark plugs

    A spark plug consists of two electrodes separeted from each other by an air gap. The side electrode is connected to the shell of the spark plug which is grounded. The center electrode is completely insulated from the shell.

    The high voltage produced in the secondary windings of the ignition coil, is applied to the center electrodeand causes a spark to jump the gap to the side electrode. The spark ignites the ful-air mixture and starts the compustionprocess in the cilynder.

    The gap between the electrodes is critical because it affects the entire range of engine performance - starting, idling, accelerating, power and top speed.

    Spark plugs must operate within a specific temperature ragne to give the best performance.

    The path to heat escape is through the insulating material, the plug shell, the gasket and threads to the cylinder head. By varying the construction of the insulator, the spark plug manufacturer is able to produce plugs with different heat dissipating characteristics.

    Types recomended by BMW / New types ::

    OLD
    NEW
    Bosch W240 T1 Short Reach Bosch W4 AC, W4AP Platina
    Lodge HHN Lodge 3HN
    Champion L10S L-5
    KLG F80 F-100

    Recomended New Types

    Brand
    Type
    Bosch Bosch W4 AC, W4AP Platina
    NGK B-8HS, B-8HV, B-8ES, B-8EVX
    Champion(FR) L-5, N-3, (N-3G), L-81
    Beru 14-5A
    Lodge (UK) 3HN, HH14
    Motorcraft AE 1X
    AC Delco S41F
    KLG (UK) F-100
    BB (IT) QL-65
    Marchal (FR) CR-33
    Marelli (IT) CW 240A
  1. Spark plug comparisson charts :: [1-2-3]
  2. Part Numbering Schemes :: [NGK - Champion - Denso]
  3. NGK - cross reference charts ::
    1. Bosch [1-2-3-4]
    2. AC/Delko [1-2-3]
    3. Autolite [1-2-3]
    4. Champion [1-2]
    5. Denso [1-2]
    6. Motorcraft [1-2-3]

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