The electronically controlled variable dwell ignition system has been fitted to many makes and models of vehicles world wide. This system was first introduced in the WB Holden and the VC Commodore, the XE Falcons & some Japanese models. It is a very popular ignition conversion for the older Holden red engines. A small modification to the ignition supply voltage is all that is required to convert over to this system along with using the correct ignition coil.
This system allows a higher primary current to pass to the ignition coil, creating good intensity, combined with a long duration spark, to achieve greater total spark energy throughout the entire RPM range.
Original versions used either an oil filled design coil or were of a transformer design. The HT leads also needed an upgrade to handle the spark output and hence 8mm HT leads were used along with larger spark plug boots.
In the following video I cover how to dismantle the distributor. A link will automatically appear at the end of the video that will take you to part 2 for the re-assembly. If that fails then just click the part 2 link.
In Part 2, I cover the re-assembly.
Bosch Electronic Coil Specs.pdf
