2.4L L4 (LD9) Features & Benefits
OVERVIEW
The LD9 Twin Cam delivers power and more sophisticated technology to
entry-level buyers seeking a sporty performance kick. Small improvements for
model year 2001 add up to an overall increase in quality, reliability and
durability.
NEW OR CHANGED FOR 2001 MODEL YEAR
More Efficient Catalytic Converters
New Starter Motor
Sleeveless Coolant Sensor
New Cruise Control Module
CUSTOMER BENEFITS
BETTER CATS
The catalytic converter has the same volume as that used for model year
1999-2000. Yet improved technology allows the converter to work as
efficiently with less precious metals in the substrate, or the core of the
converter brick where the catalytic reaction begins. The new converter
reduces cost considerably and still allows the LD9 to meets National Low
Emission Vehicle (NLEV) standards.
STARTER
The new starter motor, supplied by Delco Remy America, draws less amperage
than the starter used for model year 2000, yet delivers the same cold
cranking power. That means the same starting power with less drain on the
battery. The starter is also lighter and costs less to manufacture.
SLEEVELESS COOLANT SENSOR
The coolant temperature sensor uses a plastic insulator to protect
electrical leads inside the brass housing, rather than a rubber sleeve. The
new sensor reduces the possibility of assembly rejection or shorting in
operation.
IMPROVED CRUISE CONTROL
The cruise control module has been upgraded with the latest electronic
board. The driver will notice no difference in operation, but quality,
reliability and durability are improved, and piece cost is reduced.
CONTINUING FEATURES
The LD9 received a number of improvements for model year 1999 which were
carried through to the current model year. Revisions to the composite
plastic intake manifold in 1999 improved airflow and evaporative air-fuel
mixing to improve efficiency and reduce emissions. The throttle body was
fitted with gold-plated terminals for its electrical connections to further
improve reliability and durability. Exhaust runners (which included a larger
downpipe off the manifold) were opened to a more healthy 1.75 inches over
the previous 1.5 inch as seen in the 1st gen 2.4L ( 1996-1998 )
The LD9 flywheel was revised and lightened to accommodate new Getrag
five-speed manual transaxle. For model year 1999, the latest Multec II fuel
injectors were introduced, ensuring the most precise fuel delivery possible
with a smaller, more clog-resistant injector design. The 2.4 Twin Cam began
production as the Quad Four-- Powertrain's first all-American dual-overhead
cam line four. It underwent extensive revision in 1996, when displacement
increased from 2.3 to 2.4 liters. The cam was re-profiled, and the intake
and exhaust systems were reworked to decrease engine noise. A stroke
increase, new balance shafts and hydraulic engine mounts radically improved
overall noise, vibration and harshness control over the louder 2.3L, yet the
Twin Cam kept the edgy, high-rev power delivery sporting that customers
appreciate.
LD/9 ( 1999-2k )
Displacement:
2392 cc
Compression Ratio:
9.71:1
Bore and stroke:
3.54 X 3.70
LD/9 ( 1996-1998 )
Displacement:
2392cc
Compression Ratio:
9.48:1
Bore and stroke:
3.44 X 3.98
