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Ignition physics for regular guys like me.

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Old 11-06-2017, 12:16 AM   #81
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Hey 69427, do you still have your distributor machine? If you do, are you willing to recurve my dist for a price?
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Old 11-08-2017, 02:15 PM   #82
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Hey 69427, do you still have your distributor machine? If you do, are you willing to recurve my dist for a price?
I don't presently have the time or spare parts to do that (I just moved, and my garage is completely filled with boxes of unknown contents), but I'll PM you with a couple names of members here who I believe are equipped to help you out in a timely manner.
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Old 11-30-2017, 01:27 PM   #83
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I've been wanting to try an MSD digital HEI module. As I understand it has a microprocessor or custom controller to trigger the charging and discharge of the coil, so dwell can be dynamic thru the rpm range, I think.

The other big thing is that it has a rev limiter. This would be really helpful for my trans am 4 speed that doesn't like over rev.

Can you give a mini lecture on how this module works?
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Old 11-30-2017, 02:37 PM   #84
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I've been wanting to try an MSD digital HEI module. As I understand it has a microprocessor or custom controller to trigger the charging and discharge of the coil, so dwell can be dynamic thru the rpm range, I think.

The other big thing is that it has a rev limiter. This would be really helpful for my trans am 4 speed that doesn't like over rev.

Can you give a mini lecture on how this module works?
Why not just get an MSD 6 box? It'll give you multiple sparks up until around 3,000 rpm and a longer, hotter spark after that. You dont even need a module with it and the box should have a rev limiter too ,depending on what box.
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Old 12-01-2017, 12:11 AM   #85
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Why not just get an MSD 6 box? It'll give you multiple sparks up until around 3,000 rpm and a longer, hotter spark after that. You dont even need a module with it and the box should have a rev limiter too ,depending on what box.
The trans am is almost completely stock and is worth more if I kept it that way. The MSD HEI modules are a stealthy mod.
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Old 12-01-2017, 12:21 AM   #86
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The trans am is almost completely stock and is worth more if I kept it that way. The MSD HEI modules are a stealthy mod.
Well, just take the box out when you decide to sell it , it's not a permanent modification.
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Old 12-01-2017, 12:29 AM   #87
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As I understand it has a microprocessor or custom controller to trigger the charging and discharge of the coil, so dwell can be dynamic thru the rpm range, I think.
it triggers the spark the same way a stock module does, only it allows the coil to produce a longer hotter spark, and it does not provide "dynamic" dwell, only a longer ,set dwell.The only thing you can adjust is rev limit. Here's from MSD site;
  • Easily installs to non-computer controlled (4-Pin) HEI housings
  • Built-in adjustable rev limiter can easily be set externally
  • Advanced dwell control for improved high rpm output
  • The Hottest HEI Module you buy-period!
  • Produces an incredible 8.5 amps of juice!
  • Adjust the rev limiter without removing the cap!
  • Fits in stock HEI distributors

Last edited by sc2dave; 12-01-2017 at 12:31 AM. Reason: added
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Old 12-01-2017, 08:11 AM   #88
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I had the MSD HEI upgrade kit. Car didn't run any better or worse with it. But I wanted a rev limiter and at the time it served that purpose. The better solution for anyone interested in proper tuning imho is a fully programmable ignition. This will allow a simple means to run higher initial timing and less mechanical. My initial is about 22* and 12* mechanical. Car purrs like a kitten and no nasty fuel odours.
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