How many CDI units are needed for a 6 cyl engine?
For 4- cylinder engine, 2 CDI units; for 6-cyl, 3 CDI units can be used. When using multi CDI units, the diode D5 (encircled in blue) has to be introduced to isolate the C6 of each section.
When to use diode D5 in multi CDI?
When using multi CDI units, the diode D5 (encircled in blue) has to be introduced to isolate the C6 of each section. Since the frequency of the oscillation is fairly (more than 150kHz), ferrite core transformers are used.
What are the Zeners in a DC CDI circuit?
The zeners, R5 and C4 forms the regulator network. The sum of the values of the zeners should be equal to required high voltage to charge the CDI’s main capacitor (C6). Or alternatively a single TVS diode with desired breakdown voltage may be used.
What are the components of a DC CDI circuit?
The circuit on left is a high voltage converter based on a blocking oscillator. The components Q1, C3, D3, R1, R2, R3 and transformer T1 forms the blocking oscillator. L1 is the primary coil and L2 is the feedback coil. C1, C2 and D1 are DC voltage smoothing components.
What does the trigger on a CDI box do?
The trigger tells the box to fire, the box determines when to fire which coil with the capacitors, and zap goes the spark plug, ad infinitum. In addition to dischargin’ those capacitors, the box may also influence your rev limit, timing advance, and other variables related to spark, but that’s it.
What kind of CDI box do I need for an ATV?
Arctic Cat Can-Am / Bombardier Honda Kawasaki KTM Polaris Suzuki Yamaha Select a Year… Select a Model… OEM Replacement and Performance CDI Boxes for ATV & Motorcycles.
What does a CDI box do on a dirt bike?
Here’s a CDI box in a dirt bike. You’ll often find them lurking under your seat. Andy Greaser photo. The basic CDI system is a trigger mechanism, coils, and a box, often black, with capacitors and other circuitry inside. The trigger tells the box to fire, the box determines when to fire which coil with the capacitors,…
What is the complexity of a CDI box?
CDI’s complexity is in its circuitry, but its ancestors relied on clever mechanical systems to fire the coils. Springs, weights, cam lobes, and other simple machines worked together to deliver spark at the right time, even as revs rose.