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New HEI module option
https://slantsix.org/forum/viewtopic.php?t=57894		 Page 1 of 1
Author:  Pierre [ Mon Jun 15, 2015 11:47 am ]
Post subject:  New HEI module option
Check thisout.

Built in adjustable rev limiter. Multiple spark throughout the rpm range, not just stopping at 3k like MSD. $70 at Summit, that's about $20ish bucks more then a name brand module.

I want a backup module to my napa/echlin that I'm currently running. Thinking about making this my main.
Author:  SlantSixDan [ Mon Jun 15, 2015 3:00 pm ]
Post subject: 
That's interesting, and the maker's name is pretty reputable. I'd like to see more than just words. Some test data would be nice, and even better would be objective comparison data between an ordinary HEI module and this one. "Multiple sparks" sounds nice, but it's not better than one spark of equal total duration. And as far as I know (I could be wrong) adaptive dwell is a feature of even regular GM HEI modules.
Author:  Pierre [ Mon Jun 15, 2015 5:40 pm ]
Post subject: 
I can't comment on active dwell. But this part intrigued me especially after the heat related issues I've been having.
Quote:
Peak current level is reached just prior to spark for maximum energy without the heat build-up, increasing coil performance and module reliability.
Author:  emsvitil [ Mon Jun 15, 2015 5:46 pm ]
Post subject: 
Some info on inductive multisparking (as opposed to MSD capacitance)

http://dtec.net.au/Multi%20Spark%20Ignition.htm
Author:  Pierre [ Mon Jun 15, 2015 10:33 pm ]
Post subject: 
Neat article, good info. Push comes to shove even if the rest is fluff an adjustable rev limiter has got to be worth the $20 difference for those that want it.
Author:  Rick Covalt [ Tue Jun 16, 2015 3:09 am ]
Post subject: 
Cool, but where is the LED display? Or is this an additional purchase?
Author:  Pierre [ Tue Jun 16, 2015 10:22 am ]
Post subject: 
No digital display. There is a single red led right in the middle of it. I think it flashes so many times to indicate so many hundred rpm it's set to.
Author:  WagonsRcool [ Fri Jun 19, 2015 8:55 pm ]
Post subject: 
Quote:
And as far as I know (I could be wrong) adaptive dwell is a feature of even regular GM HEI modules.
You're not wrong Dan, HEI increases dwell with rpm- up to a point. It's more a result of the shape of the distributor pickup's AC voltage sine wave than anything else. The HEI module merely turns on/off based on voltage levels in that sine wave. The voltage waveform gets bigger with rpm so the coil turn on point occurs "sooner" relative to the distributor reluctor tip.
Overall it's fairly clever but simple.

Multi-striking is a bit more involved but I'd think that it would only be useful/ possible at lower rpm's due to physical time restraints.

Quote:
Peak current level is reached just prior to spark for maximum energy without the heat build-up, increasing coil performance and module reliability.
If they do exactly what they describe here, then this new HEI is much more sophisticated than you might think. I interpret the ad copy as; the module changes the coil turn on point as needed to achieve its current limit peak just before the dist pickup triggers spark. The module would have to "learn" the amp curve for a given coil (a 0.3ohm coil charges faster than a 0.5ohm unit). Then it has to base the coil turn-on point on that info as well as the next predicted firing event. It's a bunch of math involved but do-able.

Old HEI was this: pickup sine wave goes up= turn-on. Sine wave goes down= turn off. This new HEI sounds like this; I want this particular coil to hit (say) 6 amps before I turn-off at this point where the pickup sine wave goes down, so I know I have to turn-on 3.0 milliseconds before this point.

I suppose they still could have based the turn-on point on the rising slope of the pickup AC waveform, but that adds some more variables.
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