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Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use. |
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A machine for raising a heavy load a small distance utilizing manual effort. Its mechanical advantage depends on the use of levers, a screw thread and gearing or a hydraulic piston and ram. |
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A timed fuel injection pump operated by a cam and having a simple plunger which, on overrunning an inlet port, causes an abrupt rise in pressure, resulting in ejection of fuel through an outlet valve to the injector atomiser in the combustion chamber. |
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A plug with a precision orifice fitted into a duct to limit the maximum flow of liquid or air resulting from different pressures on either side. |
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A calibrated jet at the top of the emulsion tube on fixed-jet carburettors which admits air into the centre of the emulsion tube to mix with petrol being drawn up the annular passage outside by the depression in the venturi, the amount of air increasing with falling petrol level and so providing compensation as the venturi depression increases with intake air speed. |
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A threaded brass plug, with a precisely-sized hole, fitted into a fuel passage in a carburettor to meter the fuel flowing from float-chamber to the atomising point in the venturi or "choke". |
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A mushroom-shaped pin inserted in a small hole in the plate valve of the thermostat in an engine's cooling system. The hole prevents an air lock building up when the valve is closed, which could prevent proper filling of the system. The jiggle pin effectively closes the hole when the flow from the pump causes a differential pressure across the closed valve. |
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A pointer, sensitively mounted to indicate vibration, such as that used on some wheel balancing equipment to show that the revolving wheel on test is out-of-balance. |
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A type of connection such as a ball joint, which consists of a spherical protrusion on one member fitting into a spring-loaded housing on the other. Such a connection may be fitted between the rods and levers of a car's steering gear, permitting a range of angular variations that is not otherwise possible. |
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A type of universal-joint, essential on front-wheel drive ( FWD) systems,' which permits large angular movement between the axes of the two members without the fluctuation in velocity that may occur with the Hookes joint. Thus, with the steering turned on full lock, the torque transmitted is constant throughout the wheel's revolution. |
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A means of connecting two shafts giving positive drive from one to the other, while allowing angular movement between the axes of the shafts (see also Hookes joint). |
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The initial movement after impact of a car's wheel striking an obstruction; the resulting opposite reaction is the rebound. |
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The machined and ground surface on which a bearing operates, such as the main and big-end journals on a crankshaft. |
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An electrical connection between two or more conductors. A junction box is a means of conveniently and neatly making a number of connections at an accessible point. |
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