My OPINION is that the only thing you will gain is a much lighter pocket.
I have not used any HEI modules to know otherwise.
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| HEI modules https://www.slantsix.org/forum/viewtopic.php?t=13982 |
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| Author: | Jopapa [ Wed Aug 10, 2005 11:05 am ] |
| Post subject: | HEI modules |
Have those of you who've done HEI conversions tried any high performance modules (how exactly can you get "high performance" from just the module anyway, other than multiple spark?), or just kept with stock GM modules? I'm curious if there's really anything to be gained from the high performance modules. |
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| Author: | Craig [ Wed Aug 10, 2005 11:17 am ] |
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My OPINION is that the only thing you will gain is a much lighter pocket. I have not used any HEI modules to know otherwise.
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| Author: | GunPilot [ Wed Aug 10, 2005 11:37 am ] |
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All the 'high performance' HEI modules like the MSD do for you is work at higher RPM, like much above 4000. That's it. |
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| Author: | Jopapa [ Wed Aug 10, 2005 11:42 am ] |
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Quote: All the 'high performance' HEI modules like the MSD do for you is work at higher RPM, like much above 4000. That's it.
That was the impression I got. And I saw nothing available that supported multi spark either. stock GM module and a second for a spare it is Now here's one other question: I've read that they have to be grounded. Is that the case itself or does one of the four terminals have to be grounded? I would figure if the case itself needs to be grounded, using an aluminum block wouldn't be such a good idea. |
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| Author: | SlantSixDan [ Wed Aug 10, 2005 1:01 pm ] |
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Quote: Now here's one other question: I've read that they have to be grounded. Is that the case itself or does one of the four terminals have to be grounded?
None of the four terminals goes to ground. The module needs to be mounted to a good heat sink and you need to use the correct heat-conductive grease between the module and the mounting surface.Quote: I would figure if the case itself needs to be grounded, using an aluminum block wouldn't be such a good idea.
Because...?
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| Author: | 64ragtop [ Fri Aug 12, 2005 6:37 am ] |
| Post subject: | Hei - Why? |
The HEI conversion article I saw looked like a kluged up cluster f***. I'm not aware of anything that has proven much better than Ma MOPAR's electronic ignition for anything like normal street driving. The DUI setup with the coil on top of the distributor cap looks like it could be more efficient simply due to a shorter hi voltage path. Even so, I have not seen numbers to show any advantage. Of course, there's always the "bubba" approach: "If it aint broke, fix it 'til it is!" |
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| Author: | SlantSixDan [ Fri Aug 12, 2005 8:53 am ] |
| Post subject: | Re: Hei - Why? |
Quote: The HEI conversion article I saw looked like a kluged up cluster f***.
Don't know what article you saw; every HEI conversion I've done has been neat and clean.Quote: I'm not aware of anything that has proven much better than Ma MOPAR's electronic ignition
HEI is better. No ballast resistor, hotter spark (can run 0.045" plug gaps easily).
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| Author: | sandy in BC [ Fri Aug 12, 2005 4:58 pm ] |
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As a regular HEI user in performance installations I have found "high performance modules" to be much better at higher RPMs...the stockers drop off at about 4000 RPM,,,my ACCEL modules go past 6000 with no probs....recommended. I find the 7 pin modules need replacement upgrade more than the old 4 pin do...if you are EFI you use the 7 pin. Last 7 pin ACCELS i bought at Summit were $19.95 |
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| Author: | sixty4dartgt [ Fri Aug 12, 2005 5:13 pm ] |
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What RPM would you say a Pertronix is good for? I mean Pertronix II with the 45k coil. Dan - What is the advantage of opening the gap on your plug ? Thanks 
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| Author: | dart63 [ Sat Aug 13, 2005 9:17 am ] |
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The Pertronix will run great until the tape holding the magnets on the rotor melts, or comes loose and scatters all of the tiny pick-up magnets throughout your distributor........ The extra gap is always good, a longer spark = better and more thorough combustion. |
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| Author: | SlantSixDan [ Sat Aug 13, 2005 9:50 am ] |
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Quote: Dan - What is the advantage of opening the gap on your plug ?
Larger gap = higher secondary voltage = hotter spark = less likelihood of misfire.Also... Larger gap = more fuel molecules physically exposed to piece of fire between electrodes = less likelihood of misfire. This is why ignition systems had to get better with the advent of emission laws and even better with the advent of catalytic converters: misfires that had been tolerable no longer were. |
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| Author: | Dart270 [ Mon Aug 15, 2005 8:25 am ] |
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I have a Pertronix on my up'n'coming race Valiant, which has been working OK up to 5000 RPM. I plan to try an HEI ACCEL or MSD unit and compare revs and power... Lou |
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