MSD (Multiple Spark Discharge) is a popular brand of performance ignition systems, and their HEI (High Energy Ignition) distributor is a common upgrade for many classic car enthusiasts. The MSD HEI distributor offers improved ignition performance, making it a popular choice for those looking to get the most out of their engine. In this article, we will explore the wiring diagram for the MSD HEI distributor and provide some frequently asked questions to help you understand how to wire this ignition system correctly.
What is an HEI Distributor?
Before we dive into the wiring diagram, let’s first understand what an HEI distributor is. HEI stands for High Energy Ignition, and it is a type of distributor that uses an ignition module and a coil to produce a high-voltage spark to ignite the fuel in the engine. Compared to traditional distributors, HEI distributors provide a stronger spark that results in better engine performance and improved fuel efficiency.
An MSD HEI distributor is a performance upgrade over a standard HEI distributor. It offers even better spark performance and higher voltage output which can translate to greater horsepower and torque. Additionally, MSD HEI distributors have adjustable mechanical advance curves, which allows for more precise timing adjustments to further optimize engine performance.
MSD HEI Distributor Wiring Diagram
The wiring diagram for the MSD HEI distributor is relatively simple. Here is a diagram that shows the wiring connections:
| Terminal | Wire Color | Description |
|---|---|---|
| B | Red | Battery Positive (+) |
| C | White | Tachometer Signal (-) |
| G | Black | Ground (-) |
| W | Yellow | Distributor Signal (+) |
As you can see from the wiring diagram, there are four terminals on the MSD HEI distributor. The B terminal is connected to the battery positive (+) terminal, the C terminal is connected to the tachometer signal (-) terminal, the G terminal is connected to the ground (-) terminal, and the W terminal is connected to the distributor signal (+) terminal.
It is important to note that the MSD HEI distributor requires a 12-volt electrical system. If your car has a 6-volt electrical system, you will need to upgrade to a 12-volt electrical system before installing the MSD HEI distributor.
FAQs
Q: What type of spark plug wires should I use with the MSD HEI distributor?
A: It is recommended to use high-quality, low-resistance spark plug wires with the MSD HEI distributor. The MSD 8.5mm Super Conductor spark plug wires are a popular choice and are designed to work specifically with MSD ignition systems.
Q: Can I use the stock ignition coil with the MSD HEI distributor?
A: While it is possible to use the stock ignition coil with the MSD HEI distributor, it is recommended to use an ignition coil that is designed to work with the MSD system. The MSD Blaster 2 coil is a popular choice and is designed to provide the high-voltage output required by the MSD HEI distributor.
Q: Do I need to use a ballast resistor with the MSD HEI distributor?
A: No, the MSD HEI distributor does not require a ballast resistor. However, if your car was originally equipped with a ballast resistor, it is recommended to remove it before installing the MSD HEI distributor.
Q: Can I install the MSD HEI distributor myself, or should I have a professional do it?
A: Installing the MSD HEI distributor is a relatively straightforward process, but if you are not comfortable working on your car’s electrical system, it is recommended to have a professional install it for you. Improper installation can lead to damage to the ignition system or even fire hazards.
Q: Will the MSD HEI distributor work with my car’s computer-controlled ignition system?
A: It depends on the specific ignition system in your car. It is recommended to consult with a professional to determine if the MSD HEI distributor is compatible with your car’s ignition system.
Conclusion
The MSD HEI distributor is a popular performance upgrade for many classic car enthusiasts. Understanding the wiring diagram and frequently asked questions can help you install this ignition system correctly and confidently. By following the wiring diagram and ensuring that all connections are made correctly, you can enjoy improved engine performance and higher horsepower and torque.
