MSD 6520 Digital Ignition Control Box - 6-Plus

The MSD 6520 Digital 6-Plus Ignition Control is a high-performance capacitive discharge ignition box engineered for street/strip applications. Powered by a 15 MHz RISC microcontroller — the fastest in its class — this unit continuously analyzes supply voltage, trigger signals, and RPM to deliver precise, powerful ignition output with timing accuracy to within 1° and 1% of the set RPM limit.

Every spark is packed with 135 millijoules of spark energy and 535 primary volts, delivering up to 45,000 volts of secondary output when paired with the MSD Blaster HVC Coil (PN 8252). Below 3,300 RPM, the Digital 6-Plus fires a series of sparks that burn through up to 20° of crankshaft rotation, ensuring complete combustion for smooth idle, crisp throttle response, and fast starts.

Key Features:

• 15 MHz RISC microcontroller — processes up to 15 million instructions per second for ultra-precise ignition control
• 135 millijoules of spark energy and 535 primary volts per spark
• Dual rotary-switch adjustable rev limiters — switch between two RPM limits in 100 RPM increments
• Single-stage timing retard for nitrous and top-end performance tuning
• Start retard reduces stress on the starter, flywheel, and engine during cranking
• LED fault display alerts to trigger signal problems or charging system issues
• Adjustable magnetic pickup compensation for accurate trigger signal recognition
• 2-step rev limiter for consistent holeshot launches and overrev protection
• Compatible with points, amplifier, and magnetic pickup inputs
• Runs on 4, 6, or 8 cylinder engines
• Full EMI protection — circuits and controller are debounced and isolated

Specifications:

• Operating Voltage: 12–18 volts, negative ground
• Current Draw: 0.7 amps per 1,000 RPM (7.2 amps at 14V and 10,000 RPM)
• RPM Range: 12,500 RPM with 14.4 volt supply
• Spark Series Duration: 20° crankshaft rotation (below 3,300 RPM)
• Primary Voltage Output: 535 volts
• Secondary Voltage Output: 45,000 volts (with MSD HVC Coil)
• Spark Energy: 135 millijoules per spark
• Dimensions: 8.5"L x 4.5"W x 2.2"H
• Weight: 3.7 lbs

The MSD 6520 Digital 6-Plus is the ideal upgrade for performance enthusiasts seeking maximum ignition power, digital precision, and advanced tuning features in a single, durable package.