  The experimental data on pi N scattering in the elastic energy region T_pi <
250 MeV are analyzed within the multichannel K-matrix approach with effective
Lagrangians. Isospin invariance is not assumed in this analysis and the
physical values for masses of the involved particles are used. The corrections
due to pi^+- pi^0 and p-n mass differences are calculated and found to be in a
reasonable agreement with the NORDITA results. Analysis shows the good
description of the all experimental observables. From the data, new values for
mass and width of the Delta^0 and Delta^{++} resonances were obtained. The
isospin symmetric version gives phase shifts values close to the new solution
for the pi-N elastic scattering amplitude FA02 by the GW group based on the
latest experimental data. Our analysis leads to a considerably smaller < 1%
isospin violation in the energy interval T_pi ~ 30-70 MeV as compared to 7% in
some older analyses, however, it does confirm recent calculations based on
chiral perturbation theory.
