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Glow Plug
Glow plug in cylinder and in package with washer
Photo © M. James
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"Glow Plug"

From Michael James,
Your Guide to Radio Controlled Vehicles.
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Definition: Similar to a spark plug, nitro-powered RCs have a glow plug that heats the fuel mixture inside the engine cylinder. The glow plug, so named because a filament inside the plug glows when the plug is hot, is heated with a battery-powered glow starter or glow plug warmer. Once the engine is running combustion keeps the glow plug hot.

An integral part of the glow plug is the glow plug washer, a tiny copper ring that goes on the glow plug before it is inserted into the engine cylinder.
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