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Product Summary

Universal Fit, Capacitive Discharge Ignition Box Output

  • Engineered to accept Hall-effect, points and mag pickup triggers
  • Adjustments can be made via four rotary dials in 100 RPM increments
  • Has an upgraded digital spark output versus the standard 6AL series
  • Includes high end overrev protection plus clutch or transbrake launch limiters
  • The multiple sparks over 20° of crankshaft rotation ensures complete combustion

Key Specs

D-722-2
MFG. Part #6421
BrandMSD
Ignition Box OutputCapacitive Discharge
CircuitryDigital
CARB EO#

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MSD 6421 Details

MSD is excited to announce the next generation of 6-Series ignition controls - the 6AL-2! The ignition control combines a new housing, new digital controls, and more power in a sleek package. Inside the new cast aluminum housing, you'll find an advanced micro-controller that manages the built-in two-step rev-limiter. The spark output of the new box has been turned up to 535 volts of primary voltage with spark energy reaching up to 135 millijoules! The multiple sparks of the 6AL-2 burn in the cylinder for 20 degrees of crankshaft rotation to ensure complete combustion.

Two more great features are the rev limits! There are two rev limiters; one for high-end overrev protection and another you can activate off a clutch or trans-brake to set a launch limit. This feature will help your car blast off the starting line! Adjustments are made via four rotary dials for 100 rpm increment control!

The all-new capacitive discharge ignition will easily connect to nearly any 12-volt negative ground distributor system.

Features:

  • All new housing, same reliable digital circuitry and performance
  • Built-in 2-Step rev control adjustable with rotary dials
  • Higher output with up to 135mJ of spark energy
  • Accepts Hall-effect, points and mag pickup triggers
  • Managed by an efficient digital processor

Learn more about determining the proper MSD ignition control box for your application by reading our tech article. MSD Ignition Box: Ignition Controller Buyer's Guide

Warranties

For warranty information, visit http://www.msdhelp.com/

MSD 6421 Specifications

D-722-2
KEY SPECS
MFG. Part #6421
BrandMSD
Ignition Box OutputCapacitive Discharge
CircuitryDigital
CARB EO#
GENERAL
Speedway Motors Catalog Part #547-6421
Rev Limiter IncludedYes
Data AcquisitionNo
RPM Range12,500 RPM with 14.4 Volts
Timing RetardNone
Coil IncludedNo
Primary Voltage535 Volts output to coil
Secondary Voltage45,000 Volts
Spark Output135 MJ
Voltage Required10-18 Volts, Negative Ground
Ignition Box ColorRed
GTIN Code085132064212
Overall Length7"
Overall Width4"
Overall Height2.00"
ColorRed
NotesVibration mounts included.
Wiring Harness IncludedYes