parameter combination for lowest smoke opacity was predicted and confirmed to be 10 % DMC with diesel, injected at 21° CA. The lowest NOx emissions were obtained from 15 % DEE with diesel, injected at 17° CA and best performance from 10 % DEE with diesel, injected at 21° CA. The proposed WSN-based Taguchi method was experimentally verified and found to be effective in predicting an optimum blend for a chosen objective with 67 % reduction in experimentation time.