Engine Swap Motor Mounts 73 620 SR20DET

In the world of automotive modification, engine swaps are a popular way to enhance performance and bring new life to classic vehicles. One such swap that enthusiasts often consider is the SR20DET engine swap into the Datsun 620, particularly the 1973 model. This article will delve into everything you need to know about engine swap motor mounts for the 73 620 SR20DET, including installation tips, compatibility issues, and performance enhancements. Whether you are a seasoned mechanic or a novice enthusiast, this guide will provide you with the insights you need to successfully complete your engine swap project.

Understanding the SR20DET Engine

The SR20DET is a turbocharged inline-four engine that has gained a reputation for its performance and tuning potential. Originally designed by Nissan, it has become a favorite among car enthusiasts for its robust design and ability to handle significant power upgrades. The engine's compact size makes it an ideal candidate for swaps into various chassis, including the Datsun 620, known for its lightweight nature and classic styling.

Specifications of the SR20DET

Displacement: 2.0 liters
Configuration: Inline-4
Turbocharged: Yes
Power Output: Approximately 200 hp (stock)
Torque: Around 200 lb-ft

Why Swap the SR20DET into a 73 Datsun 620?

When considering an engine swap for a classic vehicle like the 1973 Datsun 620, enthusiasts often look for a balance between performance, reliability, and ease of installation. The SR20DET offers several advantages:

Performance: The turbocharged nature of the SR20DET provides significant power gains over the stock engine options available in the 620.
Availability of Parts: Being a popular engine choice, parts for the SR20DET are widely available, making repairs and upgrades easier.
Weight Distribution: The SR20DET is relatively lightweight, which helps maintain the vehicle's balance and handling characteristics.
Tuning Potential: With a strong aftermarket support, the SR20DET can be tuned to achieve high horsepower numbers, making it appealing for performance enthusiasts.

Motor Mounts: The Key to a Successful Swap

Motor mounts play a crucial role in the engine swap process. They not only secure the engine in place but also align it correctly with the drivetrain and other components. For the 73 Datsun 620, custom motor mounts are typically required to accommodate the SR20DET engine. Here's what you need to know about selecting and installing motor mounts for your swap.

Types of Motor Mounts

Motor mounts come in various types, and choosing the right one is essential for a successful engine swap:

OEM Replacement Mounts: These are designed to fit the factory specifications of the original engine. They may not provide the best performance but are easy to install.
Aftermarket Performance Mounts: These mounts are designed to handle increased power and provide better engine stability. They are often made from stiffer materials to reduce engine movement during acceleration.
Custom Fabricated Mounts: For unique swaps like the SR20DET into a Datsun 620, custom mounts may be necessary. These can be fabricated using various materials, including steel or aluminum, and should be designed to accommodate the specific engine placement and alignment.

Choosing the Right Motor Mounts for Your 73 620 SR20DET Swap

When selecting motor mounts for your swap, consider the following factors:

Compatibility

Ensure that the motor mounts you choose are compatible with both the SR20DET engine and the Datsun 620 chassis. Some aftermarket companies specialize in producing mounts specifically for this type of swap, which can save you time and effort.

Material

The material of the motor mounts can affect both performance and comfort. Rubber mounts offer a smoother ride but may allow for more engine movement. On the other hand, polyurethane or solid mounts provide better stability but can transmit more vibration to the cabin.

Cost

Motor mounts can vary significantly in price. While it may be tempting to go for the cheapest option, investing in high-quality mounts can prevent issues down the line, such as engine misalignment or excessive vibration.

Installing Motor Mounts: A Step-by-Step Guide

Installing motor mounts for your SR20DET swap can be a straightforward process if you follow these steps:

Tools and Materials Needed

Socket set
Wrench set
Jack and jack stands
Engine hoist
Motor mounts (OEM or aftermarket)
Alignment tools (if necessary)

Step 1: Prepare the Vehicle

Before beginning the installation, ensure the vehicle is on a flat surface and securely lifted using jack stands. Disconnect the battery and drain any fluids that may spill during the process.

Step 2: Remove the Old Engine

Using the engine hoist, carefully remove the old engine from the Datsun 620. Ensure that all wiring, hoses, and mounts are disconnected before lifting the engine out.

Step 3: Install New Motor Mounts

Place the new motor mounts onto the engine block and ensure they are properly aligned. Use the provided hardware to secure them in place, but do not fully tighten until the engine is in the correct position.

Step 4: Position the SR20DET Engine

With the engine hoist, carefully position the SR20DET engine into the Datsun 620 chassis. Align the motor mounts with the chassis mount points. This step may require some adjustments to ensure a proper fit.

Step 5: Secure the Motor Mounts

Once the engine is in place, securely tighten the motor mounts to the chassis. Double-check the alignment and ensure that everything is correctly positioned before proceeding.

Step 6: Reconnect Wiring and Components

Reconnect all necessary wiring, hoses, and components. Ensure that everything is in order before moving on to the next steps in your swap project.

Performance Enhancements After the Swap

Once your SR20DET is successfully installed in the 73 Datsun 620, you may want to explore performance enhancements. Here are some popular modifications to consider:

ECU Tuning

Tuning the engine's ECU can significantly enhance performance by optimizing fuel and ignition maps. A professional tune can unlock additional horsepower and improve overall drivability.

Upgraded Turbocharger

If you're looking for more power, consider upgrading the turbocharger. A larger turbo can provide increased boost levels, resulting in higher horsepower numbers. Ensure that your fuel system can support the additional power.

Exhaust System

Upgrading the exhaust system can improve airflow and reduce back pressure. A performance exhaust will not only enhance power but also give your Datsun 620 a distinctive sound.

Common Challenges and Solutions

While swapping the SR20DET into a 73 Datsun 620 can be rewarding, it may also present some challenges. Here are a few common issues and their solutions:

Clearance Issues

One of the most common challenges is engine clearance, especially with the hood. Be prepared to modify the hood or engine mounts if necessary to ensure proper clearance.

Wiring Complications

Integrating the SR20DET's wiring harness with the Datsun 620 can be tricky. Consider using a wiring harness adapter or seeking professional help to ensure everything is correctly connected.

Drivetrain Alignment

Ensure that the drivetrain is aligned correctly to prevent issues such as vibrations or premature wear. Proper alignment is critical for a smooth and reliable driving experience.

Conclusion: Ready to Start Your SR20DET Swap?

Swapping an SR20DET into a 73 Datsun 620 is an exciting project that can transform your classic truck into a performance machine. With the right motor mounts, careful planning, and attention to detail, you can achieve a successful engine swap that enhances both performance and enjoyment. Remember, the key to a successful swap lies in preparation and thorough research. If you have any questions or need assistance, don't hesitate to reach out to fellow enthusiasts or automotive professionals.

Are you ready to start your engine swap journey? Share your experiences and ask questions in the comments below! Happy swapping!

For more information on engine swaps, check out these resources: