Unformatted text preview: In the CI engine only air is compressed during the compression stroke. Fuel is injected at high pressure just before TDC. After a short delay period, the fuel burns to release most of its heat just after TDC on the power stroke. The fuel must exhibit the characteristic of igniting spontaneously upon mixing with the hot compressed air. Building up sufficient level of heat in the compressed air requires a high compression ratio (~ 18:1) and a fuel that ignites with minimal delay. (Cetane rating)...
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- Fall '10
- compression ratio, TDC, compression stroke