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Distributor Again
https://www.slantsix.org/forum/viewtopic.php?t=13841		 Page 1 of 2
Author:  bwhitejr [ Fri Jul 29, 2005 8:06 am ]
Post subject:  Distributor Again
I have a 1980 D-150 225 Slant Six truck. It has an electronic ignition system in it. Does it have the same distributor (P3690788) they sell as th electronic ignition upgade for vehicles that have points? If I do some performance upgrades on the motor do I need to re-curve it? If so how?

I am really new to this, so any help would be appreciated.
Author:  Matt Cramer [ Fri Jul 29, 2005 10:33 am ]
Post subject: 
There's two electric ignition distributors. One is the same basic design as the Mopar Performance unit with a different advance curve, and the advance curve can be changed by tinkering with the springs and weights. The other is the Lean Burn unit, which has no mechanical or vacuum advance provisions whatsoever. If your distributor has a vacuum advance can, it's the same basic one they sell as the upgrade over points.
Author:  SlantSixDan [ Fri Jul 29, 2005 10:58 am ]
Post subject: 
Quote:
There's two electric ignition distributors.
  1. *-Single pickup, with vacuum advance and centrifugal advance
    *-Single pickup, without vacuum advance, without centrifugal advance
    *-Dual pickup, with vacuum advance, with centrifugal advance
    *-Dual pickup, without vacuum advance, without centrifugal advance
And that's not counting all the variation in advance system calibration.
Author:  Matt Cramer [ Fri Jul 29, 2005 11:08 am ]
Post subject: 
Oops. Didn't know about the difference between single and dual pickups. Does one have any advantages over the other?
Author:  SlantSixDan [ Fri Jul 29, 2005 11:17 am ]
Post subject: 
Quote:
Oops. Didn't know about the difference between single and dual pickups. Does one have any advantages over the other?
The dual-pickup units are used with Lean Burn (and maybe with ESA? Not sure). The single-pickup unit is the preferable unit to start with when tuning.
Author:  bwhitejr [ Fri Jul 29, 2005 3:17 pm ]
Post subject: 
Mine is the single pick-up, vacuum advance.
I saw somewhere that the distributors have badges on them (Part no.s?)
Could I tell what I have from any numbers on these plates?
Author:  SlantSixDan [ Fri Jul 29, 2005 4:17 pm ]
Post subject: 
Quote:
Mine is the single pick-up, vacuum advance
Then you're all set to go—now go read all the dist recurving info that's been posted here over the last few years (we've really had some lengthy threads on it...go search "recurve"!) and do your thing.
Author:  Highway [ Sun Apr 02, 2006 7:47 pm ]
Post subject: 
Quote:
Quote:
There's two electric ignition distributors.
  1. *-Single pickup, with vacuum advance and centrifugal advance
    *-Single pickup, without vacuum advance, without centrifugal advance
    *-Dual pickup, with vacuum advance, with centrifugal advance
    *-Dual pickup, without vacuum advance, without centrifugal advance
And that's not counting all the variation in advance system calibration.
Dan, I have a lean burn system with a vacuum advance distributor. How can I tell if it's a dual pick up? Also, will it help to convert it over to the GM HEI ignition? I'm want to get rid of the lean burn ignition.
Thanks
Author:  Charrlie_S [ Mon Apr 03, 2006 4:57 am ]
Post subject: 
Dan, I don't recall ever seeing a dual pickup, vacuum/mechanical advance. What were they used on ?
PS: does anyone have a single pickup, no advance distributer, they would part with, for the cost of shipping?
Author:  SlantSixDan [ Mon Apr 03, 2006 9:47 am ]
Post subject: 
Quote:
Dan, I don't recall ever seeing a dual pickup, vacuum/mechanical advance. What were they used on ?
Can't recall off hand. Might've been an early ELB setup.
Author:  SlantSixDan [ Mon Apr 03, 2006 9:50 am ]
Post subject: 
Quote:
Dan, I have a lean burn system with a vacuum advance distributor. How can I tell if it's a dual pick up?
If the distributor connector is a single 2-wire item, it's single-pickup. The dual-pickup distributors have a 3-wire and a 2-wire connector. Or pop off the cap and look. If you see something that looks like this, it's a single-pickup distributor:

Image

If you see something that looks like this, it's a dual-pickup distributor:

Image
Quote:
Also, will it help to convert it over to the GM HEI ignition? I'm want to get rid of the lean burn ignition.
HEI is a good way to do that!
Author:  Highway [ Mon Apr 03, 2006 6:27 pm ]
Post subject: 
Dan, I have a single pick up, would you recommend this distributor for the HEI conversion?
Author:  SlantSixDan [ Mon Apr 03, 2006 7:54 pm ]
Post subject: 
Quote:
Dan, I have a single pick up, would you recommend this distributor for the HEI conversion?
If it's got a vacuum advance (and the vacuum advance is working, then yep!
Author:  featherduster76 [ Tue Apr 04, 2006 12:42 pm ]
Post subject: 
Can you only use vacumn advance for that conversion to hei???
Author:  SlantSixDan [ Tue Apr 04, 2006 12:56 pm ]
Post subject: 
It's not that you can "only use vacuum advance" (not sure what you mean by this), it's that you wouldn't want to use one of the non-vacuum-advance distributors.
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