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are three types/shapes (at least) of glow plugs. The standard glow plug, which comes in long/standard and short (for smaller engines), in both open and idle-bar configurations, has a threaded tube that penetrates the combustion chamber to varying degrees. Due to the small size of the combustion chamber changing brands or styles of standard glow plug can affect the compression ratio. Turbo style (European/metric) and Nelson style (North American/English) glow plugs do not penetrate the combustion chamber. Instead they have an angled shoulder that

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