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The most common type of block heater is an electric heating element in the engine block, which is connected through a power cord often routed through the vehicle's grille. Some block heaters are designed to replace one of the engine's core plugs and therefore heat the engine via the coolant. [4] Alternative methods of warming an engine include: [5]
Diesel engines make use of glow plugs to heat the combustion chamber prior to ignition, improving the conditions inside the engine, while certain manufacturers have incorporated a block heater, which heats the engine block prior to ignition to reduce the problem of cold starting.
The Welch plug is a type of core plug that is made from a thin disc of metal. The Welch plug is dome-shaped and inserted into the casting hole with the convex side facing outwards. [6] When installed by striking the Welch plug with a hammer, the dome collapses slightly, expanding it laterally to seal the hole.
Glow plugs are used to help overcome this issue by introducing additional heat energy into the combustion chambers. [1] A glowplug resembles a short metal pencil. The heating element is fitted into its tip. Glowplug filaments must be made of certain materials, such as platinum and iridium, that resist oxidation and withstand high temperature ...
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Andrew Freeman (March 10, 1909 – January 17, 1996) was an American electrical engineer and the inventor of the electric block heater for automobiles. [1] Andrew L. Freeman was born in Upham, North Dakota. He attended the University of North Dakota in Grand Forks, North Dakota, where he majored in electrical engineering.
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