Truck & Off-Highway Engineering - December 2023 - 11

TECHNICAL INNOVATIONS
POWERTRAIN
Cummins' new mid-displacement turbos quieter, more efficient
Cummins announced its seventh-generation
series HE250 and HE300 wastegate
turbochargers for medium displacement
on- and off-highway commercial
engines. The turbos are sized
for 5.5- to 8-liter medium-duty diesel
engines and 8- to 11-liter natural-gas
engines. Cummins states that the
HE250 and 300 were designed to meet
the global emissions regulations from
2024 onwards including the upcoming
China Stage IV FE 2024, NSVII 2026
and Euro VII 2027.
Cummins claims significant improvements
in performance and durability compared
to the outgoing models. Both turbos
reportedly offer a 6-7% gain in overall
efficiency as well as enhanced low-speed
performance, which translates to additional
low-end torque and better compatibility
with engine start/stop systems.
The HE250 and HE300 are available in
a wide range of configurations with multiple
compressor map-widths and higher-pressure
ratios that offer better transient
response and altitude capability.
Additional features of the new wastegate
turbos include a turbine wheel with
new full-back shroud, a twin-D volute
turbine housing design, compressormounted
wastegate actuation and improved
compressor-cover surface finish.
Cummins claims a 6- to 8-dB reduction
in overall turbo noise, which the
company states was an area of focus to
meet upcoming noise regulations. Both
turbos are compatible with electric or
pneumatic actuation. The HE250 and
HE300 also reportedly are adaptable to
any aftertreatment system including
exhaust gas recirculation, selective catalytic
reduction, diesel particulate filter
and diesel oxidation catalysts.
The HE250 and HE300 first will be
Cummins' HE250
and HE300 wastegate
turbochargers are
applicable for 5.5- to 8-L
medium-duty diesel engines
and 8- to 11-L natural-gas engines.
manufactured in Wuxi, China, and later in
Dewas, India, as well. Cummins confirmed
that both turbochargers will be launched
during the first quarter of 2024.
Matt Wolfe
Mobile Weather for the
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TRUCK & OFF-HIGHWAY ENGINEERING
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December 2023 11
Visit us at
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Truck & Off-Highway Engineering - December 2023

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