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| Subject |
Re: OK Folks, Time for the EGR101 class to begin. |
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| Posted by |
kuah@splparts.com on November 18, 2005 at 6:07 PM |
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This message has been viewed 437 times. |
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| In Reply To |
OK Folks, Time for the EGR101 class to begin. posted by Ash's Z on November 18, 2005 at 03:36 PM |
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| Message |
The way EGR works to reduce combusistion temperatures is not by diluting the oxygen content. The exhaust gas is certainly hotter than the intake air so it seems counter intuitive that it lowers combustion temps. But exhaust gas is inert as far as combustion is concerned, and is cooler vs. peak combustion temps by the time it is rerouted to the intake. Think of it this way, if you had some amount of inert gas @ 800F sitting in the combustion chamber, that inert gas will act as a thermal buffer when combustion temperatures start to exceed 800F. Therefore it reduces peak combustion temperatures. In principle it is just like water injection, even though technically water injection does displace oxygen (for the same manifold pressure), the way it works is by acting as a thermal buffer. I would agree that under high loads the exhaust gas could carry enough heat energy to cause pre-ignition, as you mentioned. I think EGR can be safely removed (ie. same margin of safety as Nissan) by simply dialing back ignition timing a degree or two at cruise load points, which will reduce peak combustion temps at the expense of reduced fuel economy.
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