The Dodge 4G63 is a 1,997 cc, inline — four gasoline engine produced between 1990 and 2005. It features a cast — iron block with an aluminum DOHC 16 — valve head and was offered in both naturally aspirated and turbocharged configurations. The turbo variant delivers 175–210 kW (235–280 PS) and up to 300–390 Nm of torque, making it a performance benchmark in its era.
Fitted primarily to the Dodge Stealth R/T Turbo and Dodge Daytona R/T, the 4G63T was engineered for high — performan…
Production years 1990–1994 meet U.S. EPA Tier 1 standards; 1995–2005 models comply with LEV I/II depending on market (EPA VIN-Level Certification #EPA/DODGE/4G63/TC).
The Dodge 4G63 is a 1,997 cc inline-four gasoline engine engineered for performance applications (1990–2005). It combines DOHC 16-valve architecture with either natural aspiration or variable-vane turbocharging to deliver responsive power and high-RPM performance. Designed to meet U.S. emissions standards, it balances track-ready capability with street drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,997 cc | |
Fuel type | Gasoline | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (variable-vane) or naturally aspirated | |
Bore × stroke | 85.0 mm × 88.0 mm | |
Power output | 175–210 kW (235–280 PS) | |
Torque | 300–390 Nm @ 3,000–4,500 rpm | |
Fuel system | Multi-point fuel injection (MPI) | |
Emissions standard | U.S. Tier 1 (1990–1994); LEV I/II (1995–2005) | |
Compression ratio | 8.5:1 (turbo), 9.0:1 (NA) | |
Cooling system | Water-cooled | |
Turbocharger | Mitsubishi TD05H-16G6-9K (variable-vane) | |
Timing system | Timing belt (interference design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 145 kg |
The Dodge 4G63 was used across Dodge's Stealth and Daytona platforms with longitudinal mounting and shared with Mitsubishi under platform partnership agreements. This engine received application-specific tuning—higher boost in the Stealth R/T Turbo and revised intake manifolds in the Daytona R/T—and from 1995, OBD-II compliance introduced updated ECU calibration, creating interchange limits. Partnerships enabled shared use of the Mitsubishi 4G63T in DSM (Diamond Star Motors) vehicles. All adaptations are documented in OEM technical bulletins.
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The 4G63T's primary reliability risk is head gasket failure on early builds, with elevated incidence in high-boost or overheated applications. Internal Dodge service data from 1992 indicated over 15% of pre-1993 turbo models required head gasket replacement before 100,000 miles, while NHTSA field reports confirm timing belt neglect as a leading cause of catastrophic engine failure. Aggressive driving and improper maintenance increase thermal and mechanical stress, making coolant system integrity and belt replacement critical.
Analysis derived from Dodge technical bulletins (1990-1998) and NHTSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 4G63, especially the turbo variant, is robust when properly maintained. Early models (1990–1992) had head gasket issues, but later revisions and aftermarket upgrades improve longevity. Regular timing belt service, cooling system maintenance, and quality oil are essential. Well-cared-for engines often exceed 150,000 miles.
Key issues include head gasket failure (pre-1993), timing belt neglect leading to engine damage, turbo actuator sticking, and oil leaks from valve cover or rear main seal. These are documented in Dodge TSBs 18-11-91 and 22-04-95, with service intervals critical to prevention.
The 4G63T was used in the Dodge Stealth R/T Turbo (1991–1996) and Dodge Daytona R/T Turbo (1990–1993). It was also shared with Mitsubishi 3000GT VR-4 and Plymouth Laser RS Turbo under the DSM partnership. All are longitudinal, front-engine, all-wheel-drive coupes.
Aftermarket ECU tuning is common on the 4G63 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In stock form, the 4G63T averages 18–22 mpg (U.S.) city and 25–28 mpg highway. Real-world consumption depends heavily on driving style. Turbo models are less efficient under boost, while NA variants achieve slightly better economy. Expect 20–24 mpg combined in mixed driving.
Yes, the 4G63 is an interference engine. If the timing belt fails, pistons will contact open valves, causing severe internal damage. Immediate replacement at 90,000-mile intervals is mandatory. Always inspect belt condition and tensioner operation during maintenance.
Dodge specifies SAE 10W-30 or 5W-30 API SL/SM grade oil. Use high-quality synthetic or blend for turbocharged models to ensure proper lubrication and heat dissipation. Change oil every 6,000–7,500 miles or as per driving conditions to protect the turbo and valvetrain.
Comprehensive technical documentation and regulatory references
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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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