  We present in this talk the recent investigation of the effective weak chiral
Lagrangian within the framework of the instanton-induced chiral quark model.
The low energy constants in leading order $g_8$ and $g_{27}$, and their ratio
are determined. The momentum-dependence of the constituent quark mass turns out
to improve the low energy constants to the great extent, respecting the $\Delta
T=1/2$ enhancement.

High Energy Physics - Phenomenology