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.
Step back in time to the renaissance age of the UK and European Car Industries
All that is happening NOW in the world of classic cars.
Step into the golden decade of the UK and European Car Industries
Got a question, a comment, a suggestion or an offer??? - FEEL FREE TO CONTACT US ANYTIME!!
Catch up with all the latest news and features.
Sign up for a Classic Car Info Twitter account.
All you need to know on how to acquire, restore and maintain a Classic Car