CARBON FOULING: Describes the situation when the two electrical terminals of the spark plug become gradually coated with carbon, causing a reduction in efficiency that will lead to intermittent firing or complete failure.
CARBON PIN: Describes a thin cylinder of carbon located in the distributor cap used to transfer high tension electricity from the coil to the rotor to the high-tension leads going to the spark plugs.
COMPOUND ELECTRODE: Describes a spark plug with a copper core and a jacket of a nickel-based alloy.
CONTACT ARM: Describes the movable segment of the points when moved by the lobe of the distributor.
CONTACT BREAKER GAP: Describes the distance between the contact points at their furthest opening.
CONTACT BREAKER PLATE: Describes the plate on which the breaker points are mounted.
CONTACT BREAKER POINT: Describes the individual contact of the breaker points.
CONTACT POINTS: Describes a set of movable points or areas that, when pressed together, complete a circuit, usually made of tungsten, platinum, or silver.
CONTACT SET: Describes a set of replacement parts consisting of breaker points and possibly breaker plate and condenser.
COPPER CORE: Describes the centre electrode of a spark plug or the centre wires of a high-tension wire, either of which is made of copper.
FIRING END: Describes the part of the spark plug which extends into the combustion chamber.
FIXED CONTACT: Describes the stationary point in a set of contact breaker points, with the other point being the moving part.
FLASHOVER: Describes the characteristic of electrical current to travel down the outside of a spark plug instead of through the centre electrode.
FLAT SEAT: Describes the seat of a spark plug by a gasket
FOLLOW-UP SPARK: Describes the secondary spark that occurs when a spark is extinguished and re-ignited in the course of the spark duration, especially if the mixture is turbulent.
GAP: Describes the distance between the centre terminal (electrode) and the outer terminal (electrode) in a spark plug through which the spark must travel.
GAP BRIDGING: Describes the formation of carbon or other deposits across the spark plug gap which will cause the plug to short out
GAP STYLE: Describes the shape of spark plug electrodes.
GAPPING: Describes the procedure of adjusting the distance between the points of a contact breaker.
GLASS SEAL: Describes a conducting seal found in certain spark plug insulators that connects the top and bottom parts of the central electrode
GRIT BLASTING: Describes a procedure for cleaning spark plug electrodes through bombarding them with abrasive particles.
GROUND ELECTRODE: Describes the side electrode of a sparking plug.
HEAT PATH: Describes the path along which heat passes from the spark plug tip to the water jacket
HEAT RANGE: Describes a range of temperatures starting from the operating temperature of a given style of spark plug, with the speed at which it transfers heat is considered in terms of hot and cold plugs.
HEAT RANGE RESERVE: Describes the distance to the start of pre-ignition under further increasing thermal loading of the spark plug, expressed in degrees crankshaft, the amount by which the factory-set ignition timing can be further advanced without preignition occurring.
HOT PLUG: Describes a variety of spark plug with a long insulator nose which absorbs more heat and dissipates heat slowly.
INSULATOR TIP: Describes the tip of a spark plug.
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