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Old 02-20-2013, 09:58 AM
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There are some special pin HEI distributor modules that provide spark retard functions of about 5 degree's when the correct pin is wired to ground. Perhaps you could find the correct knock sensor that would allow you to do this by simply wiring the pin through the sensor to chassis ground, you may need a relay. I think some of them needed the pin to see 12 V to do the same thing.

Wire a toggle in series to disable the trigger and maybe another toggle to manually force the retard function for starting up an agressively timed motor etc etc etc.

This could be a popular mod if we can figure out a basic configuration for it, me thinks it has been done.

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Old 02-20-2013, 10:15 AM
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Building on what Custom10 has said, the 82-86 ( I think ) LE9 305 engines come with electronic spark control that has an HEI distributor that has a 5-pin module, a distributor with a 4-pin computer connection AND vacuum advance AND mechanical advance, a tip-in sensor (for automatics only, I think), and a knock sensor. In theory, it should be transplant-able into any sbc, but I think the knock sensor itself would require some experimentation to find the right one.

Matt

Last edited by morcey2; 02-20-2013 at 10:34 AM.
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Old 02-20-2013, 12:35 PM
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Originally Posted by Custom10 View Post
There are some special pin HEI distributor modules that provide spark retard functions of about 5 degree's when the correct pin is wired to ground. Perhaps you could find the correct knock sensor that would allow you to do this by simply wiring the pin through the sensor to chassis ground, you may need a relay. I think some of them needed the pin to see 12 V to do the same thing.

Wire a toggle in series to disable the trigger and maybe another toggle to manually force the retard function for starting up an agressively timed motor etc etc etc.

This could be a popular mod if we can figure out a basic configuration for it, me thinks it has been done.
If you're going through all that effort then just go with full electronic spark control with either HEI, EDIS, or COP. HEI and EDIS are both relatively cheap and easy to do. COP requires a cam sensor which can complicate things (adding a crank sensor is much easier).
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Old 02-20-2013, 12:39 PM
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Thanks ap72 , I understand now that without a computer than all I got is pretty much an idiot light but that's all I'm really after. I like the sound of f,birds little amp.
I got no ping ATM, at least not that I can detect. Just thought it might be a handy thing if I get a bad load of fuel while I'm out of town.

I was in line at McDonalds yesterday morning ,at my daughters request I must add, and this guy was pulled up in front of me....just had to take a photo, ha ha!


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Old 02-20-2013, 12:41 PM
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Originally Posted by Custom10 View Post
There are some special pin HEI distributor modules that provide spark retard functions of about 5 degree's when the correct pin is wired to ground. Perhaps you could find the correct knock sensor that would allow you to do this by simply wiring the pin through the sensor to chassis ground, you may need a relay. I think some of them needed the pin to see 12 V to do the same thing.

Wire a toggle in series to disable the trigger and maybe another toggle to manually force the retard function for starting up an agressively timed motor etc etc etc.

This could be a popular mod if we can figure out a basic configuration for it, me thinks it has been done.
Me thinks that's a bloody good idea too!


Duke
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Old 02-20-2013, 12:56 PM
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Originally Posted by morcey2 View Post
Building on what Custom10 has said, the 82-86 ( I think ) LE9 305 engines come with electronic spark control that has an HEI distributor that has a 5-pin module, a distributor with a 4-pin computer connection AND vacuum advance AND mechanical advance, a tip-in sensor (for automatics only, I think), and a knock sensor. In theory, it should be transplant-able into any sbc, but I think the knock sensor itself would require some experimentation to find the right one.

Matt
Thanks Matt , yeah that's all doable i'm sure. you and costom10 have good points there. I'll prolly just do the little amp thing that f,bird mentioned at this stage, and go with full electronic spark control, as ap72 says, in the future.



Duke
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Old 02-20-2013, 01:09 PM
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Thanks Matt , yeah that's all doable i'm sure. you and costom10 have good points there. I'll prolly just do the little amp thing that f,bird mentioned at this stage, and go with full electronic spark control, as ap72 says, in the future.



Duke
FWIW, as already said I get a lot of my parts from wrecking yards (I'm a bit of a cheap ***) and with one little "major" expense (a MS1 controller) you can put together your own EFI/computer controlled spark system for less than $400 total- less than $200 if you're super tight ***.

You can also integrate a knock snesor if you want BUT I still think you're spending time looking in the wrong direction. Even if you only spend $100 on your complete project a good EFI/spark controller will be MUCH more beneficial for durability, power, and mileage- not to mention temperature swings and is not much more. Hell, easily within a year it will pay for itself, if you have a crappy carb it could be within a couple months.

Oh, and my plates read "AP 72" the plates came first, then the user name.

Last edited by ap72; 02-20-2013 at 01:15 PM.
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