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sv51macross · 12-11-2010, 12:28 AM

A thread about a MSD ignition module on RX7club got me thinking; I have little understanding of how these units work and how they are integrated with the engine.
ECU sends signal to coil, coil fires, the uber-high voltage goes through the plug wires and/or directly into the plug where the voltage sparks across the gap and grounds through the block.
But where do these ignition modules figure in, and what do they do? I take it they aren't coils themselves, but controllers? And a faq on AEM's site claims that their twin-fire module was designed with rotaries in mind...?
Might someone please educate me on the purpose of these A/M modules? What do they do that upgrading the coils/wires/plugs [and ensuring proper connections/grounds] doesn't?

12-11-2010, 12:28 AM	#1
sv51macross Rotary Fan in Training Join Date: Oct 2010 Location: Ann Arbor, Mi Posts: 47 Rep Power: 0	Forgive my ignorance, A/M ignition A thread about a MSD ignition module on RX7club got me thinking; I have little understanding of how these units work and how they are integrated with the engine. ECU sends signal to coil, coil fires, the uber-high voltage goes through the plug wires and/or directly into the plug where the voltage sparks across the gap and grounds through the block. But where do these ignition modules figure in, and what do they do? I take it they aren't coils themselves, but controllers? And a faq on AEM's site claims that their twin-fire module was designed with rotaries in mind...? Might someone please educate me on the purpose of these A/M modules? What do they do that upgrading the coils/wires/plugs [and ensuring proper connections/grounds] doesn't? __________________ 1990 Mazda RX-7 NA; Lucy, after the main antagonist from Elfin Lied. Eventual plans? Something cyberpunk and spicy.