Re: Why does diesel run with key off?

Posted by Jerry/MT on May 23, 2006 at 09:46:50 from (67.72.98.45):

In Reply to: Why does diesel run with key off? posted by Quebec Bob on May 23, 2006 at 09:01:52:

ecause it's not a "spark ignition" engine. It's a compression ignition engine. The compresion ratio is so high (16-18.5 compared to 8-9 on modern spark ignition engines)that the tempertaure rise caused by the compression of the air raises it's temperature above the auto ignition temperature of the fuel. At that high a temperature the injected fuel ignites. To stop the engine, you shut off the fuel.

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