Compare Advance HCD 800 Advance HCD 400A Read more Remove Read more Remove Ratios (i) 3.429 3.96 4.391 4.905 5.474 5.889 (kw/rpm) 0.625 0.588 0.551 0.515 Ratios (i) 3.96 4.33 4.43 4.476 4.70 5.0 5.53 5.89 (kw/rpm) 0.331 0.293 0.272