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Single, Twin, Four and Eight Channel CDI's |
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The CDI/8 is a state of the art Capacitor Discharge Ignition that can drive up to eight true CDI ignition coils. This gives the CDI/8 the ability to control
It can be driven by a single wire from a MoTeC ECU or can be used standalone with full RPM and Load mapping of the ignition advance.
It features powerful diagnostics capabilities which allow verification that the spark actually fired as well as internal circuit diagnostics.
The MoTeC CDI/8 has been the Ignition system of choice for engine tuners who are regularly producing 10 horsepower per cubic inch using methanol and turbochargers.
Dont fall prey to the Milli-joule Wars!
MoTeC has spared no expense within all of it's CDI boxes, to bring you the highest possible continuous duty and reliable spark energy. Many manufacturers claim higher Milli-joule ratings but the components to sustain those output levels are simply not available. If the capacitor used is 1uF and is charged to 450 volts the resulting mJ rating will be about 102. A higher rating will sacrifice components within the CDI unit itself. It is possible to use a capacitor with additional capacitance to increase energy output but the tradeoff is charge time, meaning the max rpm rating will be reduced.
In gasoline trim, the CDI/8 has been used to produce upwards of 3100 Horsepower using twin turbocharged, Ken Duttweiler tuned Big Block Chevrolets.
A word about voltage!
There is apparently a misconception floating around about the strength of your ignition and the battery voltage with which it is supplied. Whether or not you are using capacitive discharge or inductive ignition, the amount of energy released from the ignition coil is related to the physical characteristics of the coil and the amount of energy which is either stored or discharged through the coil. In the case of a CD ignition, as long as there is sufficient battery voltage available to charge the capacitor completely in the amount of time available between firings - full voltage will be supplied to the coil and full output voltage will be supplied to the spark plug. Increased battery voltage simply reduces the amount of time it takes to charge the capacitor completely. MoTeC CDI units can charge their capacitors in less than 1mS down to 6.5 volts. If you are running 6.5v on an 8 cylinder (lots of firings per engine cycle) you will have to be turning over 16,000 before you have a problem with spark energy due to battery voltage.