Technical Specifications Of The 1992 Nissan 240sx (s13 Chassis)

Alright, let's dive into the nitty-gritty of the 1992 Nissan 240SX (S13 chassis). This car is a legend for a reason, offering a fantastic platform for modification and just plain fun. We'll cover the technical specifications you need to know, whether you're wrenching in your garage or just want a deeper understanding of this iconic vehicle.

Engine & Drivetrain

The heart of the 1992 240SX is the KA24DE engine. This is a 2.4-liter inline-four, naturally aspirated (meaning no turbocharging or supercharging), and features a DOHC (Dual Overhead Camshaft) design. This means there are two camshafts in the cylinder head controlling the intake and exhaust valves, which allows for better breathing and potentially higher horsepower compared to a SOHC (Single Overhead Camshaft) engine.

KA24DE Specifications:

Displacement: 2389 cc (2.4 L)
Bore x Stroke: 89.0 mm x 96.0 mm (3.50 in x 3.78 in)
Compression Ratio: 9.5:1
Fuel Delivery: Electronic Fuel Injection (EFI)
Horsepower: 155 hp (116 kW) @ 5600 rpm
Torque: 160 lb-ft (217 Nm) @ 4400 rpm

Now, about that horsepower and torque. Keep in mind these are factory figures. Age, maintenance, and even minor modifications can affect these numbers. Also, the 9.5:1 compression ratio means you'll be running premium fuel for optimal performance and to avoid knocking (pre-ignition in the cylinders). EFI ensures consistent fuel delivery for improved efficiency and performance compared to older carburetor systems.

Transmission Options:

The 240SX came with two transmission choices:

5-Speed Manual: This is the enthusiast's choice, providing greater control and a more engaging driving experience. The transmission is a robust unit, but age can take its toll. Inspect for worn synchros (especially in 2nd and 3rd gear) and leaks.
4-Speed Automatic: A more relaxed option, suitable for daily driving. While not as performance-oriented as the manual, it's a reliable transmission when properly maintained.

Both transmissions send power to the rear wheels via a driveshaft. The rear differential is a crucial component, responsible for splitting the torque and allowing the wheels to turn at different speeds during cornering. The stock differential is an open differential, which means it transfers power to the wheel with the least amount of traction. This is fine for everyday driving, but for drifting or performance applications, an LSD (Limited Slip Differential) is a popular and worthwhile upgrade. An LSD helps distribute power more evenly, improving traction and handling.

Chassis & Suspension

The S13 chassis is renowned for its balanced handling and responsive feel. It utilizes a MacPherson strut suspension system both in the front and rear.

Suspension Details:

Front Suspension: MacPherson strut, coil springs, and stabilizer bar.
Rear Suspension: MacPherson strut, coil springs, and stabilizer bar.

A MacPherson strut combines the shock absorber and spring into a single unit, simplifying the design and reducing weight. The stabilizer bars (also known as sway bars) help reduce body roll during cornering. The S13's suspension geometry provides a good starting point for upgrades. Many aftermarket components are available, including coilover kits, adjustable control arms, and upgraded sway bars.

Braking System:

The braking system on the 1992 240SX consists of:

Front Brakes: Vented disc brakes. Vented discs are designed to dissipate heat more effectively than solid discs, reducing brake fade.
Rear Brakes: Solid disc brakes.
ABS (Anti-lock Braking System): Optional. ABS prevents wheel lockup during hard braking, allowing the driver to maintain steering control.

The brake master cylinder is responsible for generating hydraulic pressure to actuate the brakes. Regular brake fluid flushes are crucial to maintain optimal braking performance. Consider upgrading to stainless steel brake lines for improved brake feel and reduced brake line expansion under pressure. Larger brake rotors and calipers are popular upgrades for increased stopping power, especially if you've increased engine power.

Steering:

The 240SX utilizes a rack and pinion steering system. This provides a direct and responsive steering feel. Power steering was standard. Check the power steering system for leaks and ensure the fluid level is correct. Worn tie rod ends and ball joints can negatively affect steering precision. Upgrading to a quicker steering rack (one with a lower turning ratio) is a common modification for quicker steering response. Also check the HICAS (High Capacity Actively Controlled Steering) system if equipped. This system, while intended to improve handling, can become a reliability concern over time and many owners choose to delete it.

Dimensions & Weight

Understanding the dimensions and weight of the 240SX is important for suspension tuning, wheel fitment, and overall handling characteristics.

Wheelbase: 97.4 inches (2474 mm)
Length: 176.8 inches (4491 mm)
Width: 66.5 inches (1689 mm)
Height: 50.6 inches (1285 mm)
Curb Weight: Approximately 2700-2800 lbs (1225-1270 kg). This can vary depending on options and trim level.

The relatively short wheelbase contributes to the 240SX's nimble handling. The low curb weight also plays a significant role in its performance. Reducing weight is a common goal for many enthusiasts, as it improves acceleration, braking, and handling.

Electrical System

The 240SX uses a 12-volt electrical system. The battery provides the initial power to start the engine and operate electrical components. The alternator charges the battery while the engine is running.

Key Electrical Components:

Battery: Provides power for starting and accessories.
Alternator: Charges the battery and powers electrical components while the engine is running.
Starter: Cranks the engine to start it.
ECU (Engine Control Unit): Controls engine functions such as fuel injection, ignition timing, and idle speed.
Sensors: Various sensors provide data to the ECU, including the MAF (Mass Airflow) sensor, TPS (Throttle Position Sensor), coolant temperature sensor, and oxygen sensor.

Electrical issues are common in older cars. Check the wiring harnesses for corrosion and damage. Use a multimeter to diagnose electrical problems. Upgrading the wiring harness, especially for aftermarket components, can improve reliability and performance. A faulty ECU can cause a variety of engine problems, so proper diagnosis is crucial. It is important to check the condition of your wiring, especially the grounds. A poor ground connection can cause many intermittent electrical issues.

Common Issues and Considerations

Like any car of this age, the 1992 240SX has its share of potential problems. Here are a few things to watch out for:

Rust: A major concern, especially in areas with harsh winters. Check the undercarriage, rocker panels, and wheel wells for rust.
Valve Cover Gasket Leaks: The valve cover gasket can become brittle and leak oil over time.
Timing Chain Tensioner: The KA24DE engine uses a timing chain, but the tensioner can wear out and cause the chain to slack.
MAF Sensor Issues: A dirty or faulty MAF sensor can cause poor engine performance.
Wiring Harness Problems: As mentioned earlier, wiring issues are common in older cars.

Modifications: The 240SX is a popular platform for modifications. Common modifications include engine swaps (such as the SR20DET or LS series engines), suspension upgrades, and aftermarket wheels. Keep in mind that modifications can affect reliability and performance. Be sure to research thoroughly and choose quality parts. Also, consider the impact on emissions regulations in your area.

The 1992 Nissan 240SX is a fantastic car with a rich history and a strong following. Understanding its technical specifications is key to maintaining, modifying, and enjoying this iconic vehicle. With proper care and attention, it can provide years of driving pleasure. Happy wrenching!