The CDI-AC (Capacitor Discharge Ignition – Alternating Current) system in the 139QMB engine is crucial for generating the electrical spark needed to ignite the fuel-air mixture within the engine. This ...

If you've ever used a modern ignition box to send more spark to your combustion chambers, you're likely familiar with the term capacitor discharge (CD). Pontiac offered a system as an option in ...

AEM Introduces the First Dual Capacitor CDI Ignition Module! AEM announced the release of its new Multi-Channel C2DI Twin-Capacitive Ignition Module, affirming the company's commitment to ...

We called MSD to clear un some common Questions about installing an MSD 6AL with the integral rev limiter, but the information presented here is typical of aftermarket capacitor-discharge ignition ...

A CDI box, or capacitor discharge ignition (or thyristor ignition) box, is typical on motorcycles, including most 3 wheel motorcycle models, certain cars, and small motors like those in lawnmowers.

The MSD ignition features a capacitor, which is quickly charged with 460 to 480 volts and stores it until the ignition is triggered. With the capacitive discharge design, the voltage sent to the ...