MSD 7222 7AL-2 Plus Ignition Control Box with 2-Step Rev Control

The MSD 7222 7AL-2 Plus Ignition Control is the evolution of the most popular ignition box in drag racing. Building on the legendary 7AL-2 platform, the "Plus" model delivers over 40% more spark energy through redesigned internal components, pushing output to 160 mJ per spark and 47,000 volts of secondary voltage — ensuring a hotter, more consistent fire at every RPM.

A key upgrade over the standard 7AL-2 is the built-in 2-Step Rev Control, allowing racers to set a firm launch RPM limit for consistent, repeatable starts. Rev limiting is smooth and backfire-free, with easy adjustments made via plug-in RPM modules. The unit operates on 4, 6, or 8-cylinder engines and is compatible with points, magnetic pickups, crank triggers, and electronic amplifiers.

A diagnostic troubleshooting LED flashes with every coil fire, giving instant confirmation that the coil, trigger source, and ignition are all functioning correctly — a valuable tool in the paddock or pits. Dual terminal strips simplify wiring in tight race car applications. The mounting pattern is identical to the original 7AL-2 for straightforward swaps.

Key Features:

• 160 mJ spark energy — over 40% more than the standard 7AL-2
• 47,000 volts secondary voltage; 570 volts primary voltage
• Built-in 2-Step rev control for consistent launch RPM
• Diagnostic LED confirms coil and trigger operation at a glance
• Terminal strips for simplified and secure wiring
• Compatible with 4, 6, and 8-cylinder engines
• RPM range: up to 14,000 RPM at 14.4 volts
• Voltage requirement: 12–18 volts, negative ground
• Current draw: 6 amps per 6,000 RPM; 12 amps at 12,000 RPM
• Spark series duration: 20 degrees of crankshaft rotation
• Includes 3,000, 7,000, 8,000, and 9,000 RPM modules
• Includes vibration mounts; same mounting pattern as original 7AL-2

Note: This ignition control is designed for racing applications only. It is intended for use on uncontrolled (non-emissions controlled) vehicles or vehicles used exclusively for closed-competition racing. Not compatible with distributorless ignition systems.