Does LH2.2 burn rich at boost? - Saab 900 Bulletin Board - Saabnet.com
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Does LH2.2 burn rich at boost?
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Posted by mag [Email] (#1906) [Profile/Gallery] (more from mag) on Mon, 13 Jul 2009 02:39:15 Share Post by Email
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Some gasoline engines inject surplus fuel (about 15%) under acceleration to cool the engine and reduce NOx formation.

Q: Does C900 (especially LH2.2) do that, i.e. run rich at boost?

Comment: Since ethanol burns 400 - 650 degrees F cooler than gasoline, overinjecting is not required with ethanol. The FlexFuel 2005 9-5 reportedly gets better mileage and more power from e85 than gasoline at boost. This flies in the face of the fact that ethanol has fewer BTU's per volume than gasoline. Remember, a lump of coal has a tremendous number of BTUs but yields terrible mileage in a Saab. BTU is not the same thing as road mileage.

If C900 *does* run rich at boost, this gives us reason for optimisim about neat ethanol in Saabs. Hence the question.



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