The Global Engine Manufacturing Alliance LLC, or GEMA, is a manufacturing arm of Global Engine Alliance LLC, which is a joint venture of Chrysler, Mitsubishi Motors, and Hyundai Motor Company for developing a line of shared engines.
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
. 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 has 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
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.
The GEMA 1.8L I-4 is a dual overhead cam (DOHC) inline 4-cylinder gasoline engine capable of and produces of torque. The engine has displacement of 109.7 cubic inches (1798 cc) with a bore of and a stroke of . The compression ratio is 10.5:1.
The 1.8L DOHC inline 4 cylinder engine serves as the standard engine in the Dodge Caliber SE and SXT trim.
The 2.0 L GEMA DOHC inline 4-cylinder gasoline engine capable of and produces of torque. The engine has a displacement of 121.9 cubic inches (1,998 cc) with a bore of 3.38 inches (86 mm) and a stroke of 3.38 inches (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 will be the base engine for the 2007 Chrysler Sebring and 2008 Dodge Avenger.
The 2.4 L 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 144.0 cubic inches (2,360 cc) of displacement with a bore of and a stroke of . A turbocharged
variant of this engine will be used in the high-performance SRT-4
version of the Caliber.
The 2.4 engine is also the standard engine in the North American 2007 Chrysler Sebring and 2008 Dodge Avenger.