Mitsubishi 4G63 Engine Specs, Problems And Reliability

One of the most popular four-cylinder, in-line engines is called the Mitsubishi 4G63 engine. It was created by Japanese specialists who work for Mitsubishi, and about a dozen modifications have been installed on many models made by Mitsubishi.

The Mitsubishi 4G63 engine belongs to the Sirius 4G6 family, first introduced in 1980. It is a 2-liter naturally aspirated four-cylinder engine with a long history of use, widely used for vehicles including Mitsubishi, Plymouth, and Hyundai. The design has experienced many upgrades throughout production.

The Mitsubishi 4G63 engine was originally built with a cast-iron cylinder block and an aluminum head to reduce the risk of overheating. Depending on the modification, it has either DOHC or SOHC gas distribution, with one camshaft in 2-valve mode or two valves per cylinder. The 16-valve model appeared in 1990, making it possible for that engine to generate power levels similar to larger engines even when at a 2-liter size.

4G63 Engine Specs

The breakdown of the engine code is as follows:

• CA – Engine Family
• 18 – 1.8 Liter Displacement
• D – DOHC (Dual Overhead Camshafts)
• E – Multi-Point Fuel Injection

The 4G63 2.0L engine requires 5.6 US Quarts (5.3 Liters) of new SAE 10W-30 oil for an oil change with a new oil filter.

What Cars Have A Mitsubishi 4G63 Engine?

Mitsubishi 4G63 Engine Modifications

• 4G631 was a SOHC 16-valve version with an 8.5 compression ratio and 133 horsepower at 6,000 rpm.
• In the mid-eighties, the 4G63T modification appeared; this variation had a turbocharging system and a 12-valve system. Distinguished by increased power levels, this variant received limited distribution for its imperfections in design when used on low grades of carburetors. The only exception was with sports variants where it produced about 300 horsepower, which satisfied drivers with enviable driving dynamics.
• The 4G636 is a 16-valve SOHC engine with a compression ratio of 10:1, and a power output of 133HP at 6,000rpm. Torque is 176Nm at 4,750 rpm.
• The 4G637 was Mitsubishi’s DOHC 16-valve engine to be used in many popular models, including the Lancer 9 and Outlander. The compression ratio is 10.5:1, and it produces 135 hp at 5,750 rpm with a maximum torque of 176 Nm at 4,500 rpm.

4G63 Engine Problems And Reliability

1. The appearance of vibration in 4G63T. Problems with the power unit’s balance shafts, caused by decreased lubrication under high loads, can lead to wear and vibration. These problems could be solved by replacing worn-out balance shafts. In addition, a weak point of the engine is mounting studs that are prone to excess vibration when they become loose; these should also be replaced when any signs of excessive vibration appear.
2. Rough idle. The Mitsubishi 4G63 engine has experienced problems due to the temperature sensor, fuel injectors or throttle valves. Repair is complicated by diagnosing a failed element and much more difficult on older engines that cannot access computer diagnostic options.
3. The appearance of knocking in the engine under load. By 35,000 miles you may need to replace hydraulic lifters in our 4G63 engine due to wear. A knock might appear at around 50,000 miles. High-quality oils are recommended for this engine, as well as changing it every 6,000 miles or sooner if you notice increased knocking from a failing valve adjustment on one of the camshafts!

Should I Build My Engine To Handle More Power Than I Expect To Need, To Build In Room For Future Power Growth?

It is not uncommon for customers to ask the question, “Exactly what can this engine be tailored to?” The quick answer might appear as though we could go nuts with tuning-“just make it handle any amount of power”!

The fallacy feeds through the idea that a larger scale build will provide an engine that will last longer. In reality, a smaller stage 1 engine has its place and purpose. A tighter piston to wall clearance and less ring gap won’t typically destabilize the piston on startup, which is a common forged piston cold start artifact.

Forged pistons expand when under heat but also contract during cold. When a piston warms up from running a temperature, it expands to its full size again. Until this happens, the larger piston clearance means that the piston will rattle in the bore of an engine block and cause damage to both parts via attrition over time. As a general rule of thumb for building engines for maximum longevity, we recommend a build that suits your goals and needs while maintaining good power performance.

What Combination Is Best, And Why Should I Choose It?

One of the most popular upgrades for modern cars is swapping their powerplant with a newer, more powerful model. The user is given four different engines to choose from, and this article outlines their specific pros and cons in detail.

2.0l 4G63 engine

Pros: High revving with good rod ratio

Cons: Evo blocks are harder to track down, so there is no option for an extra displacement. They also have the same exhaust energy as other blocks within their class.

2.3 4G63 based “Stroker” engine

Pros: Easy displacement that bolts in where the 2.0l goes without any modifications

Cons: The 4G63 engine features a shorter rod, which may increase piston wear compared to other engines. This is troubling because these blocks are scarce, and it does not seem possible for Mitsubishi to produce more of them.

2.4 4G64 based engine

Pros: Big displacement with minimal rod ratio loss for the longevity of bore. 4G64 block cores are easy to come by and vastly less expensive.

Cons: A high-performance engine with a 6mm taller block requires that the head be degreed and cam gears are adjusted for optimum efficiency.

A fully detailed review of this engine is required, as it has many important specifications to cover.

Conclusion

Mitsubishi’s 4G63 engine series is known for its reliability and high-performance potential.

Installing upgraded shafts, microchips, and cold starts is a simple tune-up for the Mitsubishi 4G63 engine.

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Mitsubishi’s naturally-aspirated Lancer engine can be turbocharged to produce an increase in power of 100-150 horsepower. This is done with the help of a manifold, cylinder head, piston group, pan, liners and fuel pump that are specifically designed for this purpose.

You can get the engine power up to 250 horsepower if you put the Evolution sports modification on. However, it’s complicated and should be done by an experienced professional.

A cheap and easy way to tune this engine is by using a sports direct-flow exhaust system. Depending on the type of exhaust, the car gets about 20-25 horsepower. The sound of the car changes from quieter to a powerful eight-cylinder drive; like an entirely new vehicle with more power than before!

When you buy a 4G63 engine, it used to be that 500-600 horsepower was many horsepowers. Now, customers are looking for 750-800 wheel horsepower. They’re putting down close to 900-1,000 horsepower at the crank.

The Mitsubishi 4G63 has the potential to offer a stock engine that can make 1,200-1,300 hp. Users have reached this horsepower even while neglecting aspects of the engine, such as external internals and aftermarket parts. For instance, some enthusiasts with lower horsepowers cars regularly outrun those who set higher numbers in these areas.