The 6G7 series or Cyclone V6 engine is a series of V6 piston engines from Mitsubishi Motors. Five displacement variants were produced from 1986 to 2021, with both SOHC and DOHC, naturally aspirated and turbo charged layouts. While MIVEC variable valve timing has also been implemented in some versions the 2.5, 3.0 and 3.5 L versions were also available with gasoline direct injection. This engine has been the flagship powerplant of the company except when they briefly built a V8 in 1999–2001. The staple of their high-end sedans, it was given twin-turbos for the Mitsubishi GTO, and became the most powerful car ever built by the company at the time. Bore and Stroke 6G71 The 6G71 model featured SOHC and produced at 5,500 rpm and at 4,500 rpm. It was installed with two valves per cylinder, and used Mitsubishi's ECI-Multi multiple port fuel injection fuel delivery system. The compression ratio was 8.9:1. An earlier version, with single-point fuel injection, only had at 5,000 rpm and at 4,000 rpm. A supercharger was installed and exclusive to the Debonair. It produces at 5,000 rpm and at 3,000 rpm. The compression ratio for the supercharged model is 8.0:1. The 6G71 engine was also converted to run on LPG, a version which was only available to the Debonair and mainly intended for commercial (taxi) use. Applications 1986–1990 Mitsubishi Galant 1986–1992 Mitsubishi Debonair 1990–1992 Mitsubishi Diamante/Mitsubishi Sigma 6G72 The 6G72 was manufactured in three different models which featured SOHC with 12-valves, SOHC with 24-valve, and DOHC with 24-valves. The latest version was used in the Mitsubishi Eclipse GT and Galant. Output in 2004 was at 5500 rpm with of torque at 4000 rpm. In the older version, used in many Chrysler models since 1987 this V6 was a SOHC 12-valve developing at 5000 rpm and of torque at 3600 rpm. The Mitsubishi models were with a 3.0 Litre 6G72 engine SOHC 24-valve developing at 5000 rpm and of torque at 4000 rpm. For the MIVEC engine output is at 6000 rpm and at 4500 rpm. The SOHC 12-valve for the second generation of Pajero can provide and , the SOHC 24-valve can provide and . The DOHC 24-Valve was used in the Mitsubishi Debonair, 3000GT and Dodge Stealth producing and of torque with a 10.0:1 compression ratio in naturally aspirated form, and as much as and of torque in turbocharged form. The turbocharged variant had