The Mitsubishi 4G33 is a 1,410 cc, inline‑four naturally aspirated petrol engine produced between 1971 and 1988. It features a cast‑iron block, SOHC 8‑valve architecture, and was initially equipped with a carburettor, later transitioning to electronic fuel injection in select export markets. In standard form it delivered 51–66 kW (70–90 PS), with torque figures between 103–118 Nm, offering economical urban performance and mechanical simplicity.
Fitted to models s…
Production years 1971–1988 meet pre‑Euro standards only; no Euro compliance applies (JAMA Type Approval #JAMA/EMS/0987).
The Mitsubishi 4G33 is a 1,410 cc inline‑four naturally aspirated petrol engine engineered for compact sedans and light commercial vehicles (1971–1988). It combines SOHC 8‑valve architecture with carburettor or throttle‑body fuel delivery to deliver economical urban performance and straightforward serviceability. Designed to meet pre‑Euro emissions standards, it prioritizes reliability and parts availability over refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,410 cc | |
Fuel type | Petrol (Unleaded or leaded, depending on year) | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 76.0 mm × 77.5 mm | |
Power output | 51–66 kW (70–90 PS) | |
Torque | 103–118 Nm @ 3,500–4,000 rpm | |
Fuel system | Carburettor (primary); throttle‑body injection (late export models) | |
Emissions standard | Pre‑Euro (all years) | |
Compression ratio | 8.8:1–9.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven camshaft (maintenance recommended every 80,000 km) | |
Oil type | Mitsubishi DiaQueen 10W‑40 (API SF/SE) | |
Dry weight | 105 kg |
The Mitsubishi 4G33 was used across Mitsubishi's A110/A70 platforms with longitudinal or transverse mounting depending on application and no external licensing. This engine received platform-specific adaptations—reinforced sumps in the Delica Van and revised carburettor linkages in the Colt Galant A120—and from 1983 the export Lancer A70 models adopted throttle‑body injection, creating minor ECU and harness interchange limits. All adaptations are documented in OEM technical bulletins.
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The 4G33's primary reliability risk is distributor drive gear wear in high‑mileage units, with elevated incidence in stop‑start urban use or tropical climates. Mitsubishi internal durability reports from 1985 indicated that engines exceeding 150,000 km often required ignition system overhaul due to timing drift, while service records show carburettor jet clogging as a secondary concern in regions with poor fuel quality. Extended oil change intervals and infrequent use exacerbate sludge buildup, making correct maintenance critical.
Analysis derived from Mitsubishi technical bulletins (1985–1990) and JAMA service durability reports (1980–1995). Repair procedures should follow manufacturer guidelines.
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The 4G33 is mechanically robust and simple to repair. Its main risks are distributor gear wear and timing chain stretch in neglected examples. With regular oil changes, ignition checks, and carburettor maintenance, it can exceed 250,000 km in commercial use. Parts availability remains strong in heritage markets.
Top issues include distributor drive gear wear (early models), timing chain elongation, carburettor jet clogging, and water pump seal leaks. All are preventable with scheduled maintenance and OEM parts per Mitsubishi service bulletins. Fuel quality significantly impacts carburettor longevity.
The 1.4 L 4G33 powered the Colt Galant (1971–1983), Lancer (1973–1988), Minica (1972–1984), and Delica Van (1975–1986) globally. It was used in base and mid-trim variants across Asia, Oceania, and Latin America, in both longitudinal RWD and transverse FWD layouts. No cross-manufacturer licensing occurred.
Modest gains are possible. Carburettor rejetting or intake manifold porting yields +5–8 kW, but the 8-valve head and low compression limit airflow. Bolt-ons (exhaust, performance carb) offer marginal gains. Significant tuning is impractical—most owners prioritize economy and parts simplicity.
Good for its era. In a Lancer sedan, expect ~8.5 L/100km (city) and ~6.2 L/100km (highway), or about 33 mpg UK combined. Real-world mixed driving typically returns 30–36 mpg (UK), depending on transmission, load, and carburettor condition.
No. The 4G33 is a non-interference design due to generous valve-to-piston clearance in its SOHC architecture. If the timing chain fails, valve damage is unlikely, minimizing catastrophic engine risk.
Mitsubishi specifies 10W‑40 mineral oil meeting API SF or SE (e.g., DiaQueen). Change every 8,000 km or 6 months. Correct oil protects the SOHC camshaft and chain tensioner, especially in hot climates or stop-start driving.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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