The Mitsubishi 4G9 engine is a series of straight-4 automobile engines produced by Mitsubishi Motors. All are 16-valve, and use both single- and double- overhead camshaft heads. Some feature MIVEC variable valve timing, and it was the first modern gasoline direct injection engine upon its introduction in August 1996. 4G91 The 4G91 uses a bore and stroke of for a total displacement of . With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head and multi-point EFI, this engine produces at 6,000 rpm and at 5,000 rpm. The 4G91 was a short-lived model, mainly built between 1991 and 1995 and rarely seen in export markets. There was also a carbureted model, with at 6,000 rpm and at 3,500 rpm. Applications Mitsubishi Lancer Mitsubishi Mirage 4G92 The 4G92 displaces . It first appeared in the late-1991 Japanese-spec Mirage RS and Super R in DOHC form. The 4G92 is basically a version of the 4G91 with the bore increased to . In the original DOHC 16V form it produces . Later, a fuel-efficient SOHC version was added, but the 4G92 is best known in its high-performance MIVEC equipped DOHC version, which fully replaced "ordinary" DOHC in 1993. Power output was raised as high as , as found in the JDM Mirage Cyborg-ZR and 1992 Lancer MR, making it one of the most powerful 1.6-litre naturally aspirated engines. A modular displacement (MD) version of the 4G92 MIVEC was also produced – MD is Mitsubishi's cylinder deactivation system which helps improve fuel consumption. 4G92P SOHC 16 Valve Total Displacement - Bore - Stroke - Compression Ratio - 10.0:1 Maximum Output (1) - at 6,000 rpm, and at 5,000 rpm Maximum Output (2) - at 5,500 rpm, and at 4,000 rpm (1): Early European and JDM versions with 20°/42° intake and 54°/2° exhaust valve timing (2): General export and later European versions with 14°/58° intake and 52°/16° exhaust valve timing 4G92 DOHC 16 Valve Total Displacement - Bore - Stroke - Compression Ratio - 11.0:1 Maximum Output - at 7,000 rpm Maximum Torque - at 4,500 rpm 4G92-MIVEC DOHC 16 Valve Total Displacement - Bore - Stroke - Compression Ratio - 11.0:1 Maximum Output - at 7,500 rpm Maximum Torque - at 7,000 rpm Applications Mitsubishi Lancer Mitsubishi Mirage Mitsubishi Carisma Proton Wira Proton Satria 4G93 The 4G93 is a engine available in both SOHC and DOHC versions. Turbocharged variants are also produced. In mid 1996