Truck & Off-Highway Engineering - October 2023 - 14

TECHNICAL INNOVATIONS
POWERTRAIN
Cummins spools up new turbo tech
Cummins Inc. and Holset Turbocharger
announced several technical revisions to
their Series 850 turbocharger. The Series
850 turbo is intended for customers with
high-horsepower engines ranging from
15-liters to 95-liters (15L to 25L per turbocharger).
The series 850 is manufactured
in Huddersfield, UK and is intended
for a wide range of off-highway applications
including power generation, agricultural,
mining, oil and gas, rail, construction
and marine.
The latest 850 reportedly offers a
new compressor stage that provides a
more efficient and aerodynamically focused
product. Like its predecessor, the
Series 850 includes Cummins' advanced
High Pressure Ratio Compressor
(HPRC) technology. This technology
was first released in 2020. According to
Cummins, this design increases turbo
flow range capability by up to 25%.
This increase in flow has reportedly
allowed customers to uprate engines by
as much as 25-40-percent without the
need to move to a 2-stage architecture.
Cummins also states that this technology
enabled additional altitude capability
for many applications. The HPRC
technology also reportedly improves
overall efficiency at a 4.5:1 pressure ratio,
which during simulated tests has
resulted in 5% to 7% BSFC improvements
for existing applications.
The latest Series 850 also features a
The updated 850 Series Holset turbocharger
offers a new compressor stage that is more
efficient and aerodynamically focused.
new inverse impeller design that has
been optimized to provide higher performance
with improved durability. The
850 is available with either a vaned or
vaneless diffuser. The vaneless design
offers enhanced map width at higher
pressure ratios, whereas vaned design
offers efficient higher pressure ratio
capability with flexibility to improve
usability by altering vane designs. The
latest 850 turbos also feature a thin
wall stainless steel compressor cover
which reduces component weight compared
to cast iron designs.
" Our Holset Turbochargers are continuously
incorporating new technology
to improve our products and exceed
performance expectations for on-and
off-highway customers, " said Lalitkumar
Suryawanshi, director, high horsepower
products. " With additional altitude capacity,
improved product efficiency and
higher power density, the Series 850 is
designed to meet emission requirements
and drive value for customers. "
A new generation
The latest Series 850 also features a new
inverse impeller design that has been
optimized to provide higher performance with
improved durability.
14 October 2023
In addition to launching the new Series
850, Cummins is also preparing to introduce
the 8th generation series 400
Holset variable geometry turbocharger.
Scheduled to launch in 2024, the
HE400VGT is intended for the 10- to
15-liter heavy-duty truck market and
The 8th generation series 400 Holset variable
geometry turbocharger is scheduled to launch
in 2024.
reportedly features significant improvements
in performance.
Cummins states that the 8th-gen
400VGT is five percent more efficient
than the outgoing version and offers
improved transient response, enhanced
compressor side oil leak robustness and
dual sourcing on key components for
supply chain flexibility.
Other technical highlights of the
HE400VGT include a new bearing system
and near-zero clearances to enhance
overall performance. According
to Cummins, these enhancements are
achieved by tighter clearances on the
compressor stage, lower radial movement
on the turbine stage, improved
surface finish and new aero designs.
The 400VGT also incorporates a smart
electric actuator and speed sensor.
" Cummins has incorporated exciting
new technologies in our latest HE400VGT
to help engine customers meet strict
emissions requirements and reduce their
total cost of ownership, " said Matthew
Franklin, director of product management
and marketing. As customers establish
their strategies for upcoming emission
regulations, CTT continues to build on the
success of previous turbocharger launches
to deliver innovative products that
meet the challenges of our customers'
engine development needs without compromising
on performance. "
Matt Wolfe
TRUCK & OFF-HIGHWAY ENGINEERING
ALL IMAGES: CUMMINS
Truck & Off-Highway Engineering - October 2023

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - October 2023
