What Is an MSD Ignition?

The MSD ignition system is a common upgrade for high-performance engines.

MSD stands for Multiple Spark Discharge. The MSD ignition module is an add-on capacitive discharge type high performance ignition system that, as the name implies, produces multiple sparks rather than a single spark at low speeds.

Benefits

High performance engines are designed to emphasize high-speed horsepower by maximizing the ability to flow air and fuel at higher RPM. In so doing, they give up efficient operation at low speeds. The multiple sparks provided by an MSD ignition have a better chance of igniting a poor mixture than a single spark per cylinder, and this alleviates the low-speed miss that could otherwise occur.

Considerations

At higher engine speeds, there is only enough time for a single, high-energy spark. Fortunately, that is all that is necessary. The MSD ignition works the same at high RPM as any other capacitive discharge ignition.

What it Fits

The MSD ignition is available for all non-computerized battery-ignition automotive engines, whether the engine has breaker points, inductive pickup or opto-electronic switching. Some of the more popular computer controlled engines are also supported, as listed on the MSD website.

References

• "Custom Auto Electrickery"; Frank Munday; 2006

Resources

• MSD: Domestic Application Guide