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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

Navigation Instructions

You will need to become familiar with thesebuttons to navigate this lesson.

The forward button will goforward one screen. Clickthis button when you are

ready to proceed from thisscreen. Notice the cursor

change.

The backbutton will go

back onescreen.

When yourmousecursor

changes to apointed

hand, a clickwill causean action.

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

D DI Systems

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

Objective

The participants will identify thecomponents and their function of a

Battery Powered Capacitor DischargeIgnition system. This will bedemonstrated by the participants

completing a written exam with 80percent accuracy.

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

DC CDI Systems

In the world of personal watercraft the ignitionsystem design has been exclusively self-poweredcapacitor discharge ignition (AC CDI) systems.

Today, due to new standards of pollution control, theAC CDI system is being replaced by a batterypowered CDI (DC CDI) system, which is one of the

most efficient ignition systems available today.

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

DC CDI Systems (contd)

The DC-CDI ignition system is similar to an AC CDIsystem except that the battery is used as the sourceinstead of an AC source (exciter) coil.

In addition, except for the DC-DC converter, the DC-CDI ignition control module is identical to the AC CDIunit.

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

Capacitor Charge

Battery Volt (12v). 220 Volts

220 volts capacitor charge

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DC CDI Systems (contd)

Then, at the right time, a switch (magnetic) that'sactuated by a disk on the end of the crankshaft putsout a pulse that causes the SCR (also in the blackbox) to dump the capacitor's several hundred voltsinto the coil.

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

Ignition Pulse Generator

2 ~ 3 Volts

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

Capacitor Discharge

220 volts

220 volts capacitor discharge

Inducing voltage into the secondary coil

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

DC CDI Systems (contd)

The coil (acting as a transformer) takes the 220 voltpulse and transforms it to approximately 30,000volts for the spark plug.

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

Secondary Current Loop

30 Kv spark

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DC CDI Theory

UTI, Inc. SEA DOO DC CDI

End

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