Chrysler LH engine
|2.7 L LH V6 in a 2002 Dodge Stratus|
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, 167cuin)) 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 (149 kW) at 5800 rpm with 190 ft·lbf (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. 24 valves were 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. First, a 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) @ 6400 rpm and 190 ft·lbf (260 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 on the Chrysler 300 and Charger, but remains at 189 for the Chrysler Sebring.
The engine was affected by an oil sludge problem and premature timing chain tensioner failure, which were fixed around 2002-2004. The oil sludge issue appears to have been caused by issues with the crankcase ventilation system, and while it affected a minority of engines, it could cause complete failure In some cases, neglected maintenance aided in premature failure (missed oil changes or increased intervals between oil changes). It has also been stated the mileage recommendation of 6,000 in the normal operating conditions was possibly too long. Leaking oil pressure sensors could also aid in engine failure. It is also a poorly designed engine in the eyes of many mechanics, the water pump is located under the timing chain cover and in an oil bath, pump changing requires draining of the engine oil (which may now have water in it from pump failure) and removal of the timing chain cover, chain, and tensioner.
Vehicles using this engine include:
- 1998-2004 Chrysler Concorde
- 1998-2004 Dodge Intrepid
- 2001-2006 Dodge Stratus sedan
- 2005-2008 Dodge Magnum SE
- 2001-present Chrysler Sebring convertible and sedan
- 2005-present Chrysler 300
- 2006-present Dodge Charger SE (Initially, only fleet models received the 2.7L in 2006)
- 2008 Dodge Avenger
- 2002-present Chrysler Intrepid (Canada)
- 2009-present Dodge Journey (non-US markets)