4A3x - A 660 cc engine designed for kei cars in 1994, enlarged to 1100 cc in 1999.Mitsubishi has developed twelve families of straight-4 engines: The 3G83T in the Minica Dangan was the first turbocharged kei car available in Japan. High performance versions used a 15v head, and can claim the distinction of being the first production engine to feature five valves per cylinder, beating rival designs from Bugatti, Toyota and Audi to the market by at least a year. 3G - Introduced in the 1980s, initially as a 550 cc, and enlarged to 657 cc in 1990 when changes in kei car regulations permitted.3B2x - The 3B20, found in the 2003 Mitsubishi i, uses a 660 cc DOHC with the company's MIVEC variable valve timing and an intercooled turbocharger, and was designed with the aim of exceeding Japan's 2010 fuel economy requirements.3A9x - The 3A91 used in the new Colt in 2005.Mitsubishi's smallest modern engines are primarily designed for the Japanese-market kei car class: NE19A - The 493 cc twin cylinder engine in the Mitsubishi 500, the first passenger car built by the company after the Second World War.ME21/ME24 - A 359 cc twin cylinder OHV engine in the 360 pickup truck and the first generation Minica.It was complemented in 1972 by a new four-stroke OHC design called Vulcan which saw service throughout the 1970s. While water-cooled, the 2G10 was a two-stroke, like its predecessor. 2G - First introduced in the second generation Minica in 1969 to replace the air-cooled ME21 powerplant.Mitsubishi's smallest powerplants, most commonly found in their earliest models in the 1960s: Where engine codes are used which include the supplemental letters, the first digit denoting the number of cylinders may be omitted, so 4G63T may be seen as G63T. 4G63T), "B" that this is the second version of the engine (e.g. "T" can indicate that the engine is turbocharged (e.g. There may also be supplementary letters after the initial four characters. It is not a guide to its place within that family, nor is it a guide to the capacity of the engine. The fourth (digit) is the specific engine model within the family.Five of the "4Gxx" straight-4 engine families had distinct names "4G1" = Orion, "4G3" = Saturn, "4G4" = Neptune, "4G5" = Astron, and "4G6" = Sirius. The third (digit) previously denoted the engine family.Their latest engines, however, do not follow any previous conventions (e.g. Two engine families were introduced using the letter "A" to denote that all the engines in the family had an alloy cylinder head. However, since the 1980s, this has changed. The second (letter) formerly referred to the fuel type "D" = diesel, "G" = gasoline.Mitsubishi engines designed since 1970 use a four-digit naming convention:
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