On top of that, Mitsubishi also increased the compression ratio from 9.0 to 9.5. Its intake valves are larger by 1 mm, and its exhaust valves by 1.5 mm in diameter. The valve sizes are also increased to enhanced high-speed demands. The rockers are also covered with Aluminum to reduce weight and noise. In parallel to the intake, the exhaust system was changed from the single to dual ports to lessen the interference caused by the exhaust gases coming from the combustion chamber. These upgrades include a smoother interior surface of the intake manifold and longer bell-mouthed shaped intake runners to allow more air to suck in. Mitsubishi integrated the MIVEC feature and put in some effort to patch some mechanical updates and improvements for a more efficient engine. The MIVEC then opens the valves wider to allow more air intake to provide more efficient power and torque in that RPM range. However, in high RPM range conditions, it has higher speed and demands for higher intake demands. When driving at a lower RPM range, MIVEC selects the smaller cam to minimize the emissions and to maximize fuel efficiency by stable combustion inside the chamber. This MIVEC technology features the switching of the cam profiles depending on the high and low engine speed modes that are tantamount to higher peak power and utilize the torque to fit different driving conditions. You can find this engine in the 2004 Mitsubishi Lancer Ralliart, Outlander, and Lancer Sportback. In the following year, 2004, Mitsubishi updated the 4G69 engine and introduced the new and innovative SOHC 16-valve head with variable valve timing technology and valve lift system or MIVEC on the intake side. Its cylinder bore was also increased from the previous 86.5 mm to 87 mm, 151 mm forged steel connecting rods, and balance shafts were still used in the block. Along with that, it has a lightweight camshaft with a 100 mm piston stroke, lightweight pistons that has a compression height of 28 mm, and a cast Aluminum intake manifold. It uses the same cast-iron cylinder block and other 4G6 series engines, which were later changed with Aluminum.Ĭompared to its predecessor, 4G69 has a lower deck height of 229 mm. This engine has an Aluminum SOHC head in its initial release and uses MPI (Multi-Point Injection) that has four valves per cylinder with roller followers. However, this engine is lighter than those of 4G64s, for this engine uses lightweight materials, hence reducing its weight.ĤG69s can displace 2.4 Liters and are rated as 161 HP at 5,750 RPM and 162 lb-ft of torque at 3,500 RPM. Its design revolves around the integration of MIVEC technology. Compression Ratio: 9.5 and 11.5 for GDIĤG69 engines are the successor of the 4G64 engines.The technology it posses and how it utilizes everything it has. So, let us discuss the Mitsubishi 4G69 engine and its power output, capabilities, limits, issues, and overall impact on the market and consumer choices. Good news because you still find some cars that carry 4G69 engines, and nine times out of ten, it will be a Chinese car. Mitsubishi replaced 4G69s with the newcomer 4B12 engine. is the only producer of such engines, later labeled as 4A9s with an Aluminum block and a timing chain exclusively for the Chinese market. The Shenyang Aerospace Mitsubishi Motors Engine Manufacturing Co. However, in 2012, Mitsubishi halted any further innovations, development, and production of Sirius 2012 engine models. 4G6 engines were the bearer of the performance badge of Mitsubishi Motors. This engine emphasizes the incorporation of Mitsubishi’s MIVEC Variable Valve Timing technology that features a separate cam profile for different driving situations.ĤG69 is a member of the Sirius Family of automobile engines that includes 4G61, 4G62, 4G63, 4G63T, 4G64, 4G67, 4G69, 4D65, and 4D68. 4G69 engine is a 2.4 L, inline-4 engine built in Shiga, Japan, and Shenyang, China.
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