MSD 6632 6 HVC-L Capacitive Discharge Ignition Box with Soft Touch Rev Limiter

The MSD 6632 6 HVC-L is a professional-grade capacitive discharge (CDI) ignition box engineered for circle track and road racing applications that demand sustained high-RPM performance. Delivering 150 millijoules of spark energy per spark up to 15,000 RPM and a 550-volt primary output to the coil, this ignition box produces the power and endurance that elite race teams rely on. The built-in Soft Touch Rev Limiter eliminates the need for a separate external rev control, reducing weight and wiring complexity.

Advanced component design sets the 6 HVC-L apart from standard ignition boxes. Hand-wound transformers generate more power at lower operating temperatures, while Field Effect transistors and an Integrated Gate Bi-Polar transistor handle higher loads and improve coil saturation. Large capacitors ensure full-strength sparks at any RPM, and an optimized heat sink provides superior thermal dissipation. All internal components are solidly mounted and encased in a clear epoxy potting compound for maximum vibration protection and durability in harsh racing environments.

Key Features:

• 150 millijoules of spark energy per spark sustained up to 15,000 RPM
• 550-volt primary voltage output to coil; 40,000-volt secondary output
• Multiple sparks delivered over 20 degrees of crankshaft rotation for improved combustion
• Built-in Soft Touch Rev Limiter — no external rev control required
• RPM limit is adjustable via plug-in modules
• 6-pin Weathertight Deutsch-style connector, mandatory for and approved by NASCAR
• Clear epoxy potting compound for vibration protection
• Clear base plate for easy technical inspection
• Accepts breaker points, amplifier, and magnetic pickup trigger inputs
• Operates on 12–18 volt negative ground electrical systems
• Built-in reverse polarity protection circuit
• No CARB Exemption Order Number — for competition use only
• Must be used with MSD HVC Coil PN 8250 (sold separately)

The MSD 6632 is supplied with rubber shock mounts and ships ready for NASCAR competition. Compatible with the MSD Soft Touch Rev Control 8738 and Soft Touch Engine Control 8968 via a dedicated 4-pin connector. Note: This product does not carry a CARB exemption order number and is intended for racing/competition use only.