Mitsubishi 4G6-Series Engines
Mitsubishi 4G6, also known as Sirius is an inline 4 engine produced by Mitsubishi. The 4G6 family was released in 1980 as the "Sirius 80" in 4th generation Galants and 2 generation Lancers. Though it is mainly used by Mitsubishi, Dodge, Hyundai and Eagle also used variants of this engine. After nearly 3 decades after its introduction, with its strong cast iron short block and proven reliability Mitsubishi still powers some of its models with 4G6 series engines.
The original engine was produced with a 6 bolts to secure the flywheel to crankshaft. 6 bolt engine went through some minor changes throughout the 80s. The major change was the DOHC head introduced in 1989. 6 bolt engines continued until mid 1993. All 4G6 engines produced after would have 7 bolt cranks. Several changes were made including crank journal width and the oil pump bolt pattern on the front of the block. These changes made swapping cranks, oil pumps and some other parts between the two (7 bolt and 6 bolt) impossible. Swapping heads and some timing parts was still possible. Starting with the Evolution IV in 1996, Mitsubishi started phasing out the old 7 bolt engines in favor of a new "backwards" 7 bolt 4G6 engine. To eliminate a shaft in the transmission, they switched the engine from facing to the left side of the car to the right. Engines continued to spin the same clockwise direction as the old motors, but head flow was reversed in order to keep the exhaust at the front of the cars. In addition to the Evo IV-IX, this engine was found in Sonatas, Galants, Outlanders, and some others.
Through out its production, different versions of this engine have been produced with displacements ranging from 1.6L to 2.4L. These versions included DOHC and SOHC models as well as turbo and naturally aspirated models. The suffix after 4G6 code was given to describe the engine displacement. The engine codes and their displacements are as follows;
- 4G61 - 1.6L
- 4G62 - 1.8L
- 4G63 - 2.0L
- 4G64 - 2.4L
- 4G67 - 1.8L
- 4G69 - 2.4L
The 4G6 series is very modular and many parts can be interchanged. There are just so many factory configurations, let alone stock ones. Among each engine code there can be many variations. Variations include, flywheel bolt pattern (6 or 7), heads, bellhousing bolt pattern, etc. Currently only 2.0L and 2.4L versions of 4G6 are in use which will soon be replaced by the new generation 4B1-Series engines.
For more information on specific engine please check out related pages.