Tier 4 Final Compliant Diesel has More Horsepower
Cummins announced its QSX15 engine will
meet near-zero emissions levels effective in
2014 with power output increased up to
675 hp (503 kW). The 15-liter diesel is designed to comply with EPA Tier 4 Final
and EU Stage IV emissions with an
aftertreatment system combining the
Cummins Particulate Filter with Selective
Catalytic Reduction (CPF- SCR). The new
675-hp top rating for the QSX15 takes the
Tier 4 Final engine 75 hp (56 kW) above
the Tier 4 Interim top rating of 600 hp (447
kW). Cummins says its SCR system for Tier
4 Final incorporates a copper zeolite-based
catalyst capable of up to 95% NOx conversion
while operating efficiently at lower
temperatures. The system features
advanced sensors to provide full closedloop
control, while Diesel Exhaust Fluid
(DEF) dosing levels are minimized with
enhanced mixing in the decomposition
pipe. Cummins also noted the complete
engine package carries forward the same
overall size from Tier 3 to Tier 4 Interim and
Tier 4 Final, and the QSX engines retain a
single Cummins Variable Geometry
Turbocharger (VGT) instead of the dual turbos
required by some competitors.
www.cummins.com
As featured in Womp 2011 Vol 05 - www.womp-int.com