Truck & Off-Highway Engineering - December 2024 - 16

IMPROVING THE AGELESS ICE
Three-way catalysts are applied to
gasoline, gasoline hybrid, ethanol,
LPG and CNG fuels that operate at
AFR (air-fuel ratio) = 1. Dimensions
and PGM loading are
optimized for usage
and targeted
legislation.
H2O
CO2
N2
NO
O2
CO
NO
N2
O2
CO
CXHY
CX
HY
O2
CO2
H2
O
CO2
FPT's XC13 engine, shown on display at the 2024 ACT Expo, can run on multiple
fuels, including diesel (left), natural gas and hydrogen (right).
pins and crankpins. Other changes include a new
valve train system, using a variable oil and water
pump, and employing advanced combustion control
and thermal management.
In its diesel configuration, the XC13 - compared to
the predecessor C13 - gains 2% more power and 12%
more torque, achieves up to 7% lower fuel consumption,
reduces weight by 10% and nets a 29% improvement
in braking power. XC13's natural gas version
gains 9% power and 10% torque, consumes up to 8%
less fuel, cuts weight by 10% and improves braking
power by 300%, compared to its C13 predecessor.
" One of our biggest requirements was to increase
the braking power of the engine brake, " Tate said. The
diesel version of the XC13 engine provides up to 600
hp (442 kW) and 2,100 lb-ft (2,850 Nm), while the
natural gas variant offers up to 520 hp (382 kW) and
1,840 lb-ft (2,500 Nm).
Stanadyne, Katech Engineering and the Propane
Education & Research Council's (PERC) involvement
in a liquid propane gas (LPG) engine project culminated
in 2023 with testing of the novel LPG components/systems
on a GM L8T engine. (Baseline engine is
a direct-injection, gasoline-fueled, 6.6-L V8 designed
for medium- and heavy-duty pickup trucks.)
A vapor lock inhibiting system - with hardware and
software strategies designed and developed by Katech
16 December 2024
Test cell shows the GM L8T with liquid propane components.
- ensures LPG delivery to a Stanadyne-developed LPG direct-injection
fuel pump (which features a unique liquid flow path design) and
injector system (including additional coatings on the fuel injectors for
greater wear resistance). Testing confirmed that the LPG system can
deliver propane fuel at a constant 350-bar pressure directly into the
engine while mitigating the potential for vapor lock.
A 250-hour performance and durability test - completed on the
firing engine - included test cycles for heat soak, hot shutdown, refueling,
and on/off-road applicable load points. During testing, the
LPG direct-injection system matched or exceeded the power and
torque performance of the baselined direct-injection gasoline engine.
TRUCK & OFF-HIGHWAY ENGINEERING
CLOCKWISE FROM TOP LEFT: JOHNSON MATTHEY; SAE/RYAN GEHM; STANADYNE/KATECH
Truck & Off-Highway Engineering - December 2024

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - December 2024
