Re: Super Coil or HEI... What\'s the difference
Actully, there is a lot more too it than that. The main reason the HEI works so well is because its bypassing the compter on the timing. The Duraspark system works in conjuction with the computer to constantly adjust the timing to keep the emissions correct. If you look at the system you will see that the dist signal goes to the control module. Based on inputs from the computer the control module will vary the timing...that is how the knock sensor can cause the timing to be retarded. By adding the HEI, you are bypassing the computer and performing about the same task as the Nutter bypass.
Truth be known...Coil voltage is way over rated...the only time it really matters is on really cold engines and under heavy load...the higher the compression, the more energy it takes for the spark to jump to the electrode. A hotter spark will not increase power. Once the air/fuel mixture ignites...it burns....what does make a difference is the timing of that spark....it needs to happen at just the right moment...too soon, pre-ignition...too late, poor power. All these factors also contribute to emissions.
The beauty of the HEI is that its a very simple and compact design with a very repeatable advance curve. It does a very good job of producing a short hot spark at just the right moment. This is actually the same thing the Jacobs systems do....but for more $$.
Bottom line....The Accel coil may help it run a little better if you have some marginal plugs or wires and if you live in one of those frozen states. Otherwise, I bet you won't see any difference.......Do the HEI.