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Old 02-07-2019, 10:43 PM   #11
RonD
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Weights were for RPM advance, vacuum advance distributors had that

Electronic spark module already has RPM from its distributor sensor, so didn't need the weights for RPM advance, it just followed simple RPM spark advance

Vacuum advance is for rich/lean ratios which needs some kind of throttle vs RPM detection, which was intake vacuum or later throttle position sensor and computer sent "vacuum advance" to spark module, i.e SPOUT on TFI, basically a Load detection for faster spark timing response.
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Old 02-07-2019, 10:44 PM   #12
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Originally Posted by 1984ranger28 View Post
I found the exact same model on ebay

https://www.ebay.com/i/302792508846?...3D302792508846
Good find

Dirtman was close, 1 out of 3, it was for an I6

Last edited by RonD; 02-07-2019 at 10:46 PM.
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Old 02-08-2019, 08:11 AM   #13
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And Chrysler did love their dual points system.
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Old 02-08-2019, 08:56 AM   #14
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Quote:
Originally Posted by RonD View Post
Weights were for RPM advance, vacuum advance distributors had that

Electronic spark module already has RPM from its distributor sensor, so didn't need the weights for RPM advance, it just followed simple RPM spark advance

Vacuum advance is for rich/lean ratios which needs some kind of throttle vs RPM detection, which was intake vacuum or later throttle position sensor and computer sent "vacuum advance" to spark module, i.e SPOUT on TFI, basically a Load detection for faster spark timing response.
"Vacuum" advance was often quite different functions that looked the same. Some systems sourced the vacuum from port in the venturi above the throttle plate, so vacuum increased as airflow through the carb increased. Some sourced it from manifold vacuum. The two signals are almost (but not quite) opposite.

I still like carbs, but the vacuum control systems you can have. I still have some documents that are basically datasheets for all those old vacuum devices, and I could make them work, but a microcontroller is so much better for that kind of thing.
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