[Diy_efi] Emissions Numbers...

[Adam Wade]

--- Mike Frels <mfrels at ix.netcom.com> wrote:

> Do you know why the HCs rise on severe lean?
> Incomplete combustion due to the mixture
> being too lean to burn fast enough? 

As well as the possibility that there will be pockets
of even leaner mixture in the combustion chamber,
depending on the homogeneity of the mixture.  But
basically, that's right on.  Go far enough and you
start to get lean misfire, where the flame kernel
around the spark plug never burns most of the mixture.
 You get even lower NOx, and higher residual O2 AND
higher hydrocarbons, while CO drops even lower.

=====
| 82 Honda CX500 Turbo (Cassandra)  90 Kwak Zephyr 550 (Daphne) |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |
| M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |

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