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| | Two-Cylinder Magazine |
 | | This “square” math talk is not to be confused with the “square” engine description discussed earlier. |
 | | Why “perfect?” Well, it could be one of those tales of engineering from days gone by, but there was a time that a four-inch bore was considered to be the ideal maximum for efficient combustion of a gasoline/air fuel mixture in a conventional, normally aspirated, carbureted, single-spark-plug, liquid-cooled, two-valve engine. |
 | | The all-fuel version of the 4 x 4 engine used in the “40” Series Tractors incorporated all of the changes made to the gasoline engine, except that a new cylinder head lowered the compression ratio to 4.7:1 in order to burn distillate, kerosene, and other heavy fuels without danger of detonation. |
| www.two-cylinder.com /may05_pg2.htm (1718 words) |
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