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Top: Science: Technology: Energy: Devices: Internal_Combustion_Engines: Two-Cycle
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This category is for two-cycle internal combustion engines, not four-cycle engines. Please submit sites about the automotive industry to the most appropriate category within Business/Automotive. Sites about general manufacturing should be submitted to Industrial Goods and Services. Please submit sites primarily selling products online to the most appropriate category within the Shopping branch as they will not be listed here. Before submitting a site, be sure to read the category description. Please submit to an appropriate subcategory, if one is available. Otherwise, submit here. Failure to submit to the most specific appropriate category can delay the consideration of your submission. For more information, please refer to the DMOZ Science FAQ. |
This category is for two-cycle internal combustion engines, not four-cycle engines. Two-cycle engines mostly use reciprocating piston layouts, but rotary types have been designed, built, and run. All two- and four-cycle engines can use Otto or Diesel cycles, and the four stages of operation and combustion (compression, ignition, expansion, exhaust) occur sequentially in time, in a common spatial area and part of the engine, a combustion chamber, usually via a piston. But in two-cycle engines, these stages occur in two cycles, not four: 1) a combined compression/ignition cycle, and then, 2) a combined expansion/exhaust cycle.
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