Chrysler LH engine
| Chrysler LH Engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer |
Chrysler Corporation (1998) DaimlerChrysler AG (1998–2007) Chrysler LLC (2007–2009) Chrysler Group LLC (2009-2010) |
| Production | 1998-2010 |
| Combustion chamber | |
| Configuration | 60° V6 |
| Displacement | 2,736 cc (167.0 cu in) |
| Cylinder bore | 86 mm (3.4 in) |
| Piston stroke | 78.5 mm (3.09 in) |
| Cylinder block alloy | Aluminum |
| Cylinder head alloy | Aluminum |
| Valvetrain | Dual overhead camshaft |
| Combustion | |
| Fuel system | Sequential Multiple-Port Fuel Injection |
| Fuel type |
Gasoline E85 |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Chronology | |
| Successor | Chrysler Pentastar engine |
The LH engine was a series of V6 engines developed by Chrysler Corporation for its LH platform cars. It is a 60-degree V6 designed for front-wheel drive applications, later adapted to rear-wheel drive ones. The 2.7 liter LH engine is based on the SOHC 3.5 L engine, though bore spacing, cylinder bore, stroke, and assembly site are different.
The 2.7 L (2736 cc, 167 CID) EER version debuted in 1998 and is built in Kenosha, Wisconsin. It is a DOHC 4-valve design. Bore is 86 mm and stroke is 78.5 mm. It is an aluminum block with cast-iron cylinder liners and aluminum heads. Output has varied depending on the application but typical was 200 hp (150 kW) at 5800 rpm with 190 pound force-feet (258 N·m) of torque at 4850 rpm. In terms of emissions, this was a TLEV engine; it runs on regular-octane (87) gasoline. Compression when launched in 1998 was 9.7:1 (increased to 9.9:1 in the LX cars). Redline occurred at 6,464 rpm, originally; and at 6,600 rpm as revised for the LX. The 24 valves are actuated by hydraulic end-pivot roller followers and hydraulic lifters. Fuel injection was sequential for six ports for all engines.
The 2.7 differed from the 3.5 liter engine from which it was derived in many ways. The Magnum version featured a variable intake system to create a supercharging effect at different engine speeds. A three-row chain replaced the timing belt of the 3.5 liter engine, and the 2.7 in the LX also has electronic throttle control and an enhancement to the intake manifold (described in greater detail below), the former to allow for the use of electronic stability control.
In 2004, the 2.7 liter engine was adapted for use in the LX series of cars, dropping peak power to 189 hp (141 kW) at 6400 rpm and 190 pound force-feet (258 N·m) of torque at 4,000 rpm; but increasing torque at launch and during mid-range operation for everyday driving. Chrysler claimed that part-throttle torque was increased by up to 10% in the primary driving range, 2100–3400 rpm. Horsepower again dropped in 2009 on the LX cars to 178 hp (133 kW) on the Chrysler 300 and Charger, but remains at 189 for the Chrysler Sebring.
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