MSD Ignition 6AL-2 Ignition Control - 6421
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Product Information
Full details
The MSD Ignition 6AL-2 (MPN: 6421) is designed for automotive enthusiasts seeking to optimize distributor-based ignition systems for maximum engine performance. It delivers a powerful spark with high energy output, leading to improved combustion, cleaner emissions, and smoother engine operation. While it offers advanced features like a 2-step rev limiter, users should be aware of the required setup knowledge for optimal integration.
All features
| Model Part Number | 6421 |
|---|---|
| Brand | MSD |
Extended Product Information
FAQs
What is the primary benefit of the MSD 6AL-2?
The primary benefit is maximizing the performance of a distributor-based ignition system through increased voltage and spark energy, leading to better combustion and engine power.
What RPM range does the MSD 6AL-2 support?
It supports an RPM range of up to 12,500 RPM with 14.4 volts.
How are the RPM limits set on the 6AL-2?
RPM limits are easily set via the rotary dials located on the unit itself.
Can the MSD 6AL-2 be used with electronic fuel injection (EFI)?
The 6AL-2 is primarily designed for distributor-based ignition systems. While it can sometimes be adapted for use with EFI systems, it is not its intended application and may require specialized wiring or control modules.
What is the difference between the 2-step rev limiter and the launch control feature?
The 2-step rev limiter sets a maximum RPM. The launch control feature uses a secondary, lower RPM limit that can be activated by a switch, ideal for controlling engine speed during a race start.
What is the 'multiple sparks' feature?
This feature means the ignition fires multiple sparks for a duration of 20 degrees on each firing stroke. This ensures more complete combustion of the air-fuel mixture, especially at lower RPMs and under load.
What is the current draw of the MSD 6AL-2?
The current draw is 0.7 amps per 1000 RPM.
Troubleshooting
Engine misfires or runs rough
Check all wiring connections to the 6AL-2, coil, and distributor for looseness or corrosion. Verify the coil and distributor are functioning correctly. Ensure the RPM limits are not set too low.
Engine will not start
Confirm the 12V power and ground connections to the 6AL-2 are secure. Check the trigger signal from the distributor. Verify the coil is receiving power.
Rev limiter not engaging
Ensure the rotary dials for RPM limit setting are correctly adjusted. Check the wiring for the 2-step limiter activation switch if used. Verify the engine is reaching the set RPM.
Reduced performance after installation
Double-check the wiring against the installation diagram. Ensure the coil's primary resistance is appropriate for the 6AL-2. Verify the distributor timing is set correctly.
Pros and Cons
Pros
- Significantly boosts engine performance and power output.
- Enhances fuel combustion for better efficiency and economy.
- Provides precise RPM control with the integrated 2-step rev limiter.
- Multiple spark technology ensures consistent and efficient combustion.
- Compatible with various trigger types, offering flexibility.
Cons
- Requires careful installation and setup by someone knowledgeable in ignition systems.
- May not be compatible with all factory ECU systems without modification.
- The advanced features require understanding for optimal tuning.
- Higher initial cost compared to basic ignition components.
Setup, Compatibility & Care
Setup: Installation of the MSD 6AL-2 requires a solid understanding of automotive electrical systems and ignition components. It typically involves wiring the unit between the distributor, coil, and power source. Referencing the included installation manual is crucial for correct wiring and functionality.
Compatibility: The MSD 6AL-2 is designed for distributor-based ignition systems and is compatible with Hall-effect, points, and magnetic pick-up triggers. Ensure your existing ignition components (distributor, coil) are in good working order and compatible with the voltage and energy output of the 6AL-2.
Care: The unit is a sealed electronic module and generally requires no user maintenance. Keep the unit clean and free from excessive dirt or moisture. Ensure all connections are secure and free from corrosion. Avoid exposing the unit to extreme vibration or prolonged exposure to high heat sources.