Global Engine Manufacturing Alliance

Global Engine Manufacturing Alliance LLC

Type	Joint venture
Industry	Automotive engineering
Founded	May 2002
Headquarters	Dundee, Michigan
Key people	Bruce A. Baumbach (General Manager)
Products	Engines
Parent	Chrysler
Website	GEMAengine.com

GEMA HQ Bldg.

The Global Engine Manufacturing Alliance LLC, or GEMA, is a manufacturing arm of Global Engine Alliance LLC, which was a joint venture of Chrysler, Mitsubishi Motors, and Hyundai Motor Company for developing a line of shared engines. In September 2009, Chrysler bought out the shares of Mitsubishi and Hyundai after a 5-year run of allied research and development.

The World Engine

The World Engine has five factories worldwide; two (GEMA) in Dundee, Michigan, United States, two in South Korea and one in Shiga, Japan. Production began in 2005 and will continue at least through 2012 with an annual capacity of approximately two million engines; each plant will be capable of producing 420,000. Twenty different automobile models from the three companies will use the engines. Each manufacturer configured their variants of the basic GEMA design differently based on their engineering needs and standards, so consumers may experience very different power, fuel efficiency, and "feel" from each manufacturer.

Chrysler's GEMA engines

GEMA produces a single family of 4-cylinder engines with variable valve timing, marketed by Chrysler as the World Engine. The range starts with a 1.8 L unit which will principally find use throughout the world, and includes 2.0 L and 2.4 L variants which will find use in the United States. Turbocharged and supercharged versions may also be produced, as in Chrysler's similar Tritec engine.

Chrysler expects to use the GEMA family of engines in nine other models and projects that it will buy up to 840,000 GEMA engines annually.

The initial design of the engine block was handled by Hyundai. It features siamesed bores, meaning that there is no coolant flow between cylinders. The aluminum block has cast-iron cylinder liners, and different liners can be fitted to alter the engine's bore.

The heads feature electro-hydraulic variable valve timing on both the intake and exhaust side. The system was based on that used by the recent Mercedes-Benz 24-valve V6 and is quite sophisticated and expensive for a low-end engine. A variable tumble control system creates air tumbles in the intake runners at low rpms for better mixture. Valves are directly actuated by solid Bucket tappets.

1.8

The GEMA 1.8 L I-4 is a dual overhead cam (DOHC) inline 4-cylinder gasoline engine capable of 148 hp (110 kW) and 125 lbf·ft (169 N·m) of torque. The engine has displacement of 109.7 in³ (1,798 cc) with a bore of 3.38 in (86 mm) and a stroke of 3.05 in (77 mm). The compression ratio is 10.5:1.

The 1.8 L DOHC inline 4-cylinder engine served as the standard engine in the Dodge Caliber SE and SXT trim for the 2007–2009 model years.

Applications:

• 2007–2009 Dodge Caliber SE and SXT, 148 hp (110 kW) 125 lb·ft (169 N·m) torque

2.0

The 2.0 L GEMA DOHC inline 4-cylinder gasoline engine capable of 158 hp (118 kW) and produces 141 lbf·ft (191 N·m) of torque. The engine has a displacement of 121.9 in³ (1,998 cc) with a bore of 3.38 in (86 mm) and a stroke of 3.38 in (86 mm). The compression ratio of the engine is 10.5:1. The 2.0 L GEMA engine is offered by Dodge in the Dodge Caliber. Outside North America, the 2.0 is the base engine for the 2007 Chrysler Sebring and 2008 Dodge Avenger.

Applications:

• Dodge Caliber SE and SXT, 158 hp (118 kW) and 141 lb·ft (191 N·m) torque
• Jeep Patriot (4x2 models only)
• Jeep Compass (4x2 models only)
• Dodge Avenger (outside North America)
• Chrysler Sebring (outside North America)

2.4

A Turbocharged 2.4L I4 GEMA Engine - 285 hp used in Dodge Caliber SRT-4

The 2.4 L, 173 hp (129 kW) GEMA engine is used by Dodge in the R/T trim line of the Caliber. The dual overhead cam (DOHC) inline four-cylinder engine has 144 in³ (2,360 cc) of displacement with a bore of 3.46 in (88 mm) and a stroke of 3.82 in (97 mm). A 285 hp (213 kW) turbocharged variant of this engine was used in the high-performance SRT-4 version of the Caliber.

The 2.4 engine is the standard engine in the North American 2007 Chrysler Sebring and 2008 Dodge Avenger. It is also used in the Jeep Compass and Patriot. The Jeep Liberty also used a 2.4 L DOHC 4-cylinder from 2002 to 2005, as did all PT Cruisers and Neon SRT4s, base minivans, Cirrus, Stratus, etc., but these were 100% Chrysler-designed (and built) engines and should not be mistaken for the GEMA engine displacing 2.4 liters.

Applications:

• 2007–2010 Chrysler Sebring
• 2011–present Chrysler 200
• 2008–present Dodge Avenger
• 2007–2011 Dodge Caliber R/T, 173 hp (129 kW) and SRT-4, 285 hp (213 kW)
• 2007–present Jeep Compass
• 2007–present Jeep Patriot
• 2009–present Dodge Journey

Tigershark

The Tigershark engine family is the name for the next generation of World Gas Engines. The major differences compared to the first generation is the updated valvetrain and intakes.

2.0

The 2.0 L Tigershark DOHC inline 4-cylinder gasoline engine has dual-variable valve timing and produces 160 hp (120 kW) and 148 lbf·ft (201 N·m) of torque.

Applications:

• 2013-present Dodge Dart

2.4

The 2.4 L Tigershark DOHC inline 4-cylinder gasoline engine uses MultiAir 2 variable-valve timing technology and produces 184 hp (137 kW) and 174 lbf·ft (236 N·m) of torque.

Applications:

• 2013-present Dodge Dart
• 2014-present Jeep Cherokee

See also

• List of Chrysler engines
• Mitsubishi 4B1 engine - Mitsubishi's GEMA engines
• Hyundai Theta engine - Hyundai's GEMA engines

External links

• Official site
• Additional information on the GEMA engine, Allpar.com