What Are the 4G67 Engine Specs? Full Technical Breakdown

If you're searching for 4g67 engine specs, you're likely restoring a classic Mitsubishi vehicle, troubleshooting performance issues, or comparing it to modern engines for a swap project. The Mitsubishi 4G67 is a 2.0L inline-four gasoline engine produced from the early 1980s through the mid-1990s, primarily used in models like the Mitsubishi Galant, Sigma, and certain Chrysler and Dodge rebadged vehicles. Key specifications include a 1997 cc displacement, SOHC 8-valve design, and output ranging from 90 to 110 horsepower depending on tuning and market. This guide delivers a comprehensive technical overview, covering dimensions, performance metrics, common applications, known reliability concerns, and how it compares to related engines like the 4G63 and 4D68.

Understanding the Mitsubishi 4G67 Engine Family

The 4G67 belongs to Mitsubishi's renowned Sirius engine series, which includes both gasoline (4G6x) and diesel (4D6x) variants. The '4' indicates an inline-four configuration, 'G' signifies gasoline fuel type, '6' places it in the mid-size displacement family, and '7' denotes its specific bore/stroke variant. Unlike the high-performance 4G63 turbo found in the Lancer Evolution, the 4G67 was designed as a reliable, economical workhorse for mid-sized sedans and wagons.

This engine shares core architecture with other Sirius units, including cast-iron block construction and aluminum cylinder head. It uses a timing belt-driven SOHC valvetrain with hydraulic lifters, reducing maintenance needs compared to solid lifter designs. Fuel delivery varies by model year and market—early versions use carburetors, while later models transitioned to multi-point fuel injection (MPFI), improving efficiency and emissions compliance.

Detailed 4G67 Engine Specifications

Beyond basic displacement and power numbers, understanding the full scope of the 4G67’s technical profile helps in diagnosing issues, sourcing replacement parts, or planning modifications.

Specification	Value
Engine Code	4G67
Configuration	Inline-4, SOHC
Displacement	1997 cc (2.0L)
Bore × Stroke	85.0 mm × 88.0 mm
Compression Ratio	8.5:1 to 9.5:1 (varies by model)
Valvetrain	8-valve, belt-driven camshaft
Fuel System	Carburetor or MPFI
Max Power Output	90–110 hp (67–82 kW) @ 5000 rpm
Max Torque	130–150 N·m (96–111 lb·ft) @ 3000 rpm
Redline	5,500 rpm
Oil Capacity	4.0–4.3 liters (with filter)
Cooling System	Liquid-cooled
Ignition System	Distributor-based or electronic

These figures are representative but can vary slightly based on regional emissions standards, fuel quality, and factory tuning. For example, North American versions often had lower compression ratios to accommodate lower-octane fuel and meet EPA regulations, resulting in reduced power output compared to Japanese Domestic Market (JDM) variants.

Common Vehicle Applications of the 4G67

The 4G67 was widely used across Mitsubishi’s lineup during the 1980s and early 1990s. Its primary role was in mid-sized sedans where durability and fuel economy were prioritized over performance.

• Mitsubishi Galant (1980–1992): Particularly in GLX and Super Saloon trims, the 4G67 provided smooth daily driving with moderate acceleration.
• Mitsubishi Sigma (Australia/NZ markets): Offered as a base or mid-level engine option in executive sedans.
• Chrysler Sigma / Dodge Challenger (Oceania): Badged versions sold in Australia and New Zealand.
• Plymouth Arrow (North America): A rebadged version of the Mitsubishi Lancer Celeste coupe.
• Mitsubishi Sapporo: Used in later non-turbo models as a more economical alternative to V6 options.

Identifying whether your vehicle has a 4G67 requires checking the engine identification tag, typically located near the cylinder head or on the timing cover. The code may also appear in service manuals or VIN decoders specific to Mitsubishi models from that era.

Performance Characteristics and Real-World Behavior

While not a performance engine, the 4G67 delivers predictable power delivery suitable for city and highway commuting. With peak torque arriving around 3,000 rpm, it feels adequately responsive under normal loads. However, drivers upgrading from modern DOHC engines may find the 4G67 sluggish at higher speeds due to limited airflow and modest compression.

Owners report average fuel economy between 25–30 mpg (U.S.) in mixed driving conditions, depending on transmission choice and maintenance status. Manual transmission models generally achieve better efficiency than automatics. The engine runs smoothly when well-maintained, though older units may develop valve train noise or oil consumption if neglected.

Reliability and Known Issues

The 4G67 is generally considered durable, especially when serviced regularly. However, several recurring issues should be monitored:

1. Timing Belt Failure: The SOHC design uses an interference fit, meaning a broken belt can cause piston-to-valve contact. Replacement every 60,000 miles (96,000 km) is strongly advised 1.
2. Carburetor Deterioration: On pre-fuel-injected models, old gaskets, clogged jets, and float problems are common after decades of disuse.
3. Head Gasket Leaks: While less prone than some contemporary engines, age-related gasket degradation can occur, especially if overheating has happened.
4. Oil Leaks: Valve cover and rear main seal leaks develop over time due to rubber gasket aging.
5. Distributor Wear: Mechanical advance mechanisms and rotor contacts wear out, leading to misfires or hard starting.

Regular oil changes, coolant flushes, and inspection of belts and hoses significantly extend engine life. Using high-quality spark plugs and ensuring proper ignition timing also prevent long-term damage.

Comparison with Related Engines: 4G63, 4G64, and 4D68

Understanding how the 4G67 differs from sibling engines helps clarify its role and potential for modification.

4G67 vs. 4G63

The 4G63 is far more famous, especially in turbocharged form (4G63T). While both share the same bore spacing and basic block layout, the 4G63 has a shorter stroke (88 mm vs. 91 mm in early 4G63), allowing higher revving. The 4G63 also features stronger internals and became the platform for Mitsubishi’s rally-bred engines. In contrast, the 4G67 lacks the structural reinforcement and tuning potential of the 4G63.

4G67 vs. 4G64

The 4G64 is a 2.4L variant with increased stroke (95 mm), producing more low-end torque. It replaced the 4G67 in many applications by the mid-1990s. Parts compatibility exists between the two, particularly for accessories and mounts, making the 4G64 a popular swap for those seeking more displacement without changing engine families.

4G67 vs. 4D68

The 4D68 is a diesel counterpart within the Sirius family, displacing 1.998 cc with similar dimensions. Found in Galants and Lancers, it produces around 68 hp and 110 lb·ft of torque, emphasizing fuel economy over speed 2. While mechanically similar in layout, the 4D68 has a heavier block, different head design, and requires specialized knowledge for maintenance. Swapping between gasoline 4G67 and diesel 4D68 is possible but involves significant ancillary changes.

Aftermarket Support and Modification Potential

The 4G67 has limited aftermarket support compared to the 4G63, but basic upgrades are feasible:

• Intake/Exhaust Tuning: Installing free-flow air filters and low-backpressure exhaust systems can improve breathing.
• Carburetor Upgrades: Replacing stock carburetors with Weber or Mikuni units can enhance throttle response.
• Ignition Enhancements: Electronic ignition kits eliminate distributor wear issues and provide more consistent spark.
• MPFI Conversion: Some enthusiasts retrofit fuel injection systems from later models to improve driveability and emissions.

However, due to its SOHC 8-valve design, the engine’s airflow ceiling is low. Significant power gains require extensive internal work, which is rarely cost-effective. Most owners focus on preservation rather than performance tuning.

Tips for Buyers and Restorers

If you’re considering purchasing a vehicle with a 4G67 engine—or already own one—here are key evaluation steps:

• Verify Service History: Look for records of timing belt replacement, oil changes, and cooling system maintenance.
• Check for Leaks: Inspect under the engine for signs of oil or coolant seepage, especially around the valve cover and water pump.
• Listen for Noises: Knocking or ticking sounds may indicate worn bearings or lifter issues.
• Test Drive Thoroughly: Ensure smooth acceleration, stable idle, and absence of smoke from the exhaust.
• Confirm Engine Number: Match the code to factory specifications to rule out incorrect or rebuilt units.

For restorers, sourcing OEM parts can be challenging. Online forums, salvage yards specializing in JDM vehicles, and reproduction component suppliers are valuable resources.

Regional Variations and Emissions Compliance

The 4G67 was tuned differently across global markets. Japanese models often had higher compression (9.5:1) and used premium fuel, yielding closer to 110 hp. Export versions, particularly in North America and Europe, featured catalytic converters, EGR systems, and lower compression to meet emissions laws, reducing output to about 90–95 hp.

Australia and New Zealand received a mix of configurations, sometimes with dual carburetors for improved performance. Always consult local workshop manuals or factory service bulletins when diagnosing or rebuilding, as specifications can differ even within the same model year.

Frequently Asked Questions (FAQs)

❓ What cars have the 4G67 engine?

The 4G67 was used in the Mitsubishi Galant, Sigma, Sapporo, Plymouth Arrow, and various rebadged models like the Chrysler Sigma in Australia.

❓ How much horsepower does a 4G67 engine produce?

Depending on configuration, the 4G67 produces between 90 and 110 horsepower, with fuel-injected and high-compression versions at the upper end.

❓ Is the 4G67 engine reliable?

Yes, the 4G67 is generally reliable when maintained properly. Regular timing belt changes and fluid services are critical to longevity.

❓ Can I swap a 4G63 into a 4G67 chassis?

Yes, many enthusiasts perform 4G63 swaps due to shared mounting points, but expect to modify wiring, cooling, and exhaust systems.

❓ What is the difference between 4G67 and 4D68 engines?

The 4G67 is a gasoline engine, while the 4D68 is a diesel variant of similar displacement. They share basic architecture but differ in fuel systems, internals, and tuning goals.