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ENGINE CLINIC

207

Compression Ratio 101 In the July column, I did a bit on the O.S. and Enya gasoline engines that utilized a glow plug rather than spark ignition. I also mentioned that most gasoline engines could be run on this special glow plug, providing that the compression ratio was at least 10:1 or higher. Several readers have asked how they could determine if their engine had a high-enough compression ratio without having to purchase the special...

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