MSD 5520 Street Fire CDI Ignition Control Box with Rev Limiter

The MSD 5520 Street Fire Capacitive Discharge Ignition (CDI) delivers full-featured ignition performance at a budget-friendly price point. Designed for 4, 6, and 8-cylinder engines, this digital CD ignition control box fires a series of multiple sparks lasting 20 degrees of crankshaft rotation when the engine is running under 3,000 RPM, ensuring complete combustion of the air/fuel mixture for improved throttle response and a smooth idle.

Built around a durable cast aluminum housing, the Street Fire CDI easily connects to points, amplifiers, and magnetic pickup distributors. Heat-protected terminals covered in black boots safeguard conductors from engine heat to ensure reliable spark delivery. The unit operates on a negative-ground system and supports a voltage range of 10–18 volts.

Key Features:

• Capacitive discharge (CDI) technology for stronger, more reliable spark
• Multiple sparks per firing event improve starting, idle quality, and high-RPM output
• Adjustable rev limiter settable from 2,000–9,900 RPM in 100 RPM increments for overrev protection
• Compatible with 4, 6, and 8-cylinder engines
• Connects to points, amplifiers, and magnetic pickup distributors
• Durable cast aluminum housing with heat-shielded terminals
• Digital circuitry for consistent full-power output at high RPM
• CARB Executive Order (EO) #D-40-43 — legal for sale and use on emissions-controlled vehicles in all 50 states

Operating Specifications:

• Current Draw: 0.7 Amp per 1,000 RPM
• Primary Voltage: 435 Volts
• Secondary Voltage: 43,000 Volts
• Spark Energy: 95 mJ per spark
• Spark Series Duration: 20° Crankshaft Rotation
• RPM Range: Up to 15,000 RPM at 14.4 Volts
• Voltage Required: 10–18 Volts, Negative Ground

Note: Solid core spark plug wires are not compatible with the Street Fire Ignition. Sold individually.