>re:  why a lean mixture makes it run hotter?
>
>Not sure why but offer that often race cars blow motors
>simply by running out of fuel due to extra heat created in
>the last few seconds of running lean (high rpms
>exacerbates).

When gasoline (or methanol in the case of most racing engines)
vaporizes, it absorbs a tremendous amount of heat energy. So, if the
engine is running lean, less heat is absorbed.

Joshua Van Tol -- jjvantol@uswest.net