Scott:

**BTW, mixture is an apparent timing shift.  Rich burns faster than lean. **

As it turns out, this is a major effect. You must quantify how rich and how lean for the second statement to be accurate. There are some rich mixtures that burn slower than some lean mixtures. As a matter of fact, 40dF ROP is the fastest burn rate mixture.

The charts you posted are true for a given mixture. As the mixture changes, the chart values would change. Mixture has a major effect on the effective timing... which is the only thing we really care about.

Walter