Lexus SC 1991-2000 4.0L V8 Engine Specifications
Explore the detailed technical specifications of the 4.0L V8 engine in the 1991-2000 Lexus SC. This guide covers performance metrics, maintenance tips, and upgrade options for enthusiasts and technicians.
Overview Specifications
This document provides detailed specifications and technical information about the 4.0L V8 engine used in the 1991-2000 Lexus SC. It is designed for enthusiasts, mechanics, and researchers seeking in-depth knowledge about this engine. The content is organized into sections covering engine design, performance, maintenance, and key specifications. Use the search and navigation instructions to quickly find relevant information.
How to Use
Use the search bar to enter keywords related to the 4.0L V8 engine, such as 'horsepower' or 'torque'. Results will highlight relevant sections and subsections for easy access.
Scroll through the document or use the table of contents to jump to specific sections. Each section is divided into subsections with detailed technical points for quick reference.
Key Specifications
Displacement
4.0L
Horsepower
260 HP
Torque
270 lb-ft
Compression Ratio
10.5:1
Fuel System
Multi-port EFI
Available Specifications
Engine Design
This section covers the design and architecture of the 4.0L V8 engine, including its construction, materials, and layout. Learn about the engine's unique features and how they contribute to its performance and reliability.
Engine Design
This section covers the design and architecture of the 4.0L V8 engine, including its construction, materials, and layout. Learn about the engine's unique features and how they contribute to its performance and reliability.
Construction and Materials
- Aluminum alloy block and cylinder heads for reduced weight
- DOHC (Dual Overhead Camshaft) design for precise valve control
- Forged steel crankshaft for durability
- Hydraulic lifters for reduced maintenance
- Nikasil-coated cylinder walls for improved wear resistance
Layout and Configuration
- 90-degree V8 configuration for smooth operation
- Longitudinal mounting for rear-wheel-drive applications
- Cross-plane crankshaft for balanced power delivery
- Sequential multi-port fuel injection system
Performance
Explore the performance characteristics of the 4.0L V8 engine, including horsepower, torque, and acceleration. This section also covers fuel efficiency and emissions compliance for the 1991-2000 Lexus SC.
Performance
Explore the performance characteristics of the 4.0L V8 engine, including horsepower, torque, and acceleration. This section also covers fuel efficiency and emissions compliance for the 1991-2000 Lexus SC.
Power Output
- 260 horsepower at 5,400 RPM
- 270 lb-ft of torque at 4,600 RPM
- Redline at 6,200 RPM
- 0-60 mph acceleration in 6.5 seconds
Fuel Efficiency and Emissions
- EPA-estimated 17 MPG city / 23 MPG highway
- Meets 1990s emissions standards with catalytic converters
- OBD-II compliant for diagnostics
- Optimized air-fuel ratio for cleaner combustion
Maintenance and Reliability
This section provides guidance on maintaining the 4.0L V8 engine, including recommended service intervals, common issues, and tips for ensuring long-term reliability.
Maintenance and Reliability
This section provides guidance on maintaining the 4.0L V8 engine, including recommended service intervals, common issues, and tips for ensuring long-term reliability.
Service Intervals
- Oil change every 5,000 miles or 6 months
- Timing belt replacement every 90,000 miles
- Spark plug replacement every 60,000 miles
- Coolant flush every 30,000 miles
Common Issues
- Valve cover gasket leaks over time
- Worn timing belt tensioners
- Carbon buildup on intake valves
- Occasional oil consumption in high-mileage engines
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Engine Specifications
Overview
- Type
- Naturally aspirated V8
- Configuration
- 90-degree V8
- Displacement
- 4.0 liters (3969 cc)
- Material
- Aluminum block and heads
- Location
- Front longitudinal
- Valvetrain
- DOHC, 4 valves per cylinder
Dimensions
- Length
- 27.5 inches (698.5 mm)
- Width
- 29.1 inches (739.1 mm)
- Height
- 26.8 inches (680.7 mm)
- Weight
- 440 lbs (199.6 kg)
- Bore
- 3.54 inches (90 mm)
- Stroke
- 3.39 inches (86 mm)
- Compression Ratio
- 10.5:1
- Oil Capacity
- 6.4 quarts (6.1 liters)
Materials
- Block
- Aluminum alloy with cast iron cylinder liners
- Cylinder Heads
- Aluminum alloy
- Pistons
- Forged aluminum
- Crankshaft
- Forged steel
- Valves
- Stainless steel
Features
- Performance
-
- 260-290 horsepower (varies by model year)
- 260-300 lb-ft torque (varies by model year)
- Redline at 6200 RPM
- Variable Valve Timing (VVT-i) on later models
- Fuel System
-
- Sequential multi-port fuel injection
- Electronic throttle control
- High-pressure fuel pump
- Cooling
-
- Dual-row aluminum radiator
- Electric cooling fan
- Thermostatically controlled coolant flow
- Ignition
-
- Distributorless ignition system
- Direct-fire coil-on-plug
- Knock control system
- Emissions
-
- Catalytic converters
- EGR system
- OBD-II compliant (1996 and later)
Safety Features
- Engine Protection
-
- Low oil pressure warning
- Overheat warning system
- Fail-safe cooling mode
- Electronic Controls
-
- Traction control system
- Engine immobilizer
- Throttle-by-wire safety
Comfort Features
- Noise Reduction
-
- Acoustic engine cover
- Hydraulic engine mounts
- Tuned intake and exhaust resonators
- Vibration Control
-
- Balanced crankshaft
- Counter-rotating balance shafts
- Dual-mass flywheel
Accessories
- Belts And Pulleys
-
- Serpentine belt with automatic tensioner
- Accessory drive pulley system
- Power steering pump
- intake And Exhaust
-
- High-flow air filter
- Dual exhaust system
- Stainless steel exhaust manifolds
- Electrical
-
- High-output alternator
- Maintenance-free battery
- Electronic control unit (ECU)
Maintenance
- Service interval
- Every 5,000 miles or 6 months
- Service Items
-
- Oil and filter change
- Spark plug replacement
- Timing belt inspection
- Coolant flush
- Air filter replacement
- Maintenance Notes
- Use synthetic oil for optimal performance. Timing belt replacement recommended every 90,000 miles.
Warranty
- Basic
- Miles: 50,000Years: 4Coverage: Bumper-to-bumper
- Powertrain
- Miles: 70,000Years: 6Coverage: Engine, transmission, drivetrain
- Corrosion
- Miles: UnlimitedYears: 6Coverage: Perforation only
- Emissions
- Miles: 80,000Years: 8Coverage: Catalytic converter, ECU, sensors
Production Details
- Manufacturer
- Toyota Motor Corporation
- Manufacturing Process
-
- Precision casting for block and heads
- CNC machining for critical components
- Automated assembly line
- Quality Control
- Testing: Cold and hot engine testing, Dyno performance validation, Leak and pressure testingStandards: ISO 9001 certified
- Sustainability Practices
-
- Recycled aluminum usage
- Low-emission manufacturing
- Waste reduction initiatives
- Production Metrics
- Units Per Day: 150Defect Rate: Less than 0.1%Energy Efficiency: 85%
Service Information for 4.0l v8 engine Service
Maintenance and service requirements specific to this component
- Oil and filter change
- Inspect belts and hoses
- Check fluid levels
- Inspect spark plugs
- Check for leaks
Use only manufacturer-recommended oil and filters.
- Replace air filter
- Inspect fuel system
- Check ignition system
- Inspect cooling system
- Test battery and charging system
Perform throttle body cleaning if necessary.
- Replace timing belt and water pump
- Replace spark plugs
- Flush coolant system
- Inspect and replace accessory belts
- Perform compression test
Timing belt replacement is critical to prevent engine damage.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 4.0L V8 engine compatible with other Lexus models from 1991-2000?
Is the 4.0L V8 engine compatible with other Lexus models from 1991-2000?
The 4.0L V8 engine, specifically the 1UZ-FE, was primarily designed for the Lexus SC 400 and LS 400 models during 1991-2000. While it shares some components with other Lexus models, direct compatibility is limited. Always verify engine mounts, wiring harnesses, and ECU compatibility before attempting installation in non-standard models.
Q2 What are the maintenance requirements for the 4.0L V8 engine?
What are the maintenance requirements for the 4.0L V8 engine?
The 1UZ-FE engine requires regular maintenance, including oil changes every 5,000 miles, timing belt replacement every 90,000 miles, and spark plug replacement every 60,000 miles. Regularly inspect the cooling system, as the engine is prone to overheating if neglected. Use high-quality synthetic oil and OEM parts for optimal performance and longevity.
Q3 How do I replace the timing belt on the 4.0L V8 engine?
How do I replace the timing belt on the 4.0L V8 engine?
To replace the timing belt, first, disconnect the battery and remove the serpentine belt. Drain the coolant and remove the radiator fan and shroud. Remove the crankshaft pulley and timing belt covers. Align the timing marks on the camshafts and crankshaft, then remove the old belt. Install the new belt, ensuring proper alignment, and reassemble components in reverse order.
Q4 What are common troubleshooting steps for engine misfires?
What are common troubleshooting steps for engine misfires?
For engine misfires, start by checking the spark plugs, ignition coils, and wiring. Inspect the fuel injectors for clogs or leaks. Verify the timing belt alignment and compression levels. Use an OBD-II scanner to identify specific fault codes. Replace faulty components and ensure proper grounding of electrical connections to resolve misfires.
Q5 How can I optimize the performance of the 4.0L V8 engine?
How can I optimize the performance of the 4.0L V8 engine?
To optimize performance, consider upgrading the air intake and exhaust systems for better airflow. Use high-performance spark plugs and ignition coils. Regularly clean the throttle body and fuel injectors. Ensure the ECU is tuned for optimal fuel-air mixture. Lightweight pulleys and a performance chip can also enhance throttle response and horsepower.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Lexus SC 400 Service Manual (1991-2000)
Coming SoonComprehensive service manual covering the 4.0L V8 engine, including repair procedures, maintenance schedules, and technical specifications.
Technical Service Bulletin: Timing Belt Replacement
Coming SoonOfficial bulletin detailing timing belt replacement intervals and procedures for the 1UZ-FE engine.
Lexus SC 400 Parts Catalog
Coming SoonDetailed catalog of OEM and aftermarket parts for the 4.0L V8 engine, including part numbers and compatibility information.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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