General Category > Quadrajet Carb Talk and Tips
17057231 or 17059232 on a 472
novadude:
--- Quote from: Kenth on January 05, 2026, 07:01:07 AM ---
And, POE arrived 1971 for Cadillac Qjets.
1971 POE was drilled right thru the choke housing wall for exit both primary and secondary when needed.
Later on only primary POE was used.
--- End quote ---
It's very likely that the '69 Cadillac carb that I had was a mismatched bunch of parts if that is the case. I will need to check the parts stash... I could also be remembering the year incorrectly.
Cadman-iac:
--- Quote from: novadude on January 05, 2026, 08:46:52 AM ---It's very likely that the '69 Cadillac carb that I had was a mismatched bunch of parts if that is the case. I will need to check the parts stash... I could also be remembering the year incorrectly.
--- End quote ---
Novadude,
That sounds like it's the case, I just took a quick look at my carbs, I've got 3 '69's and none have the primary POE system, neither does the '70 I've got. I have a '72, (7042237) that does have the POE system, and I see the secondary side POE system is the same as any other carb has, not what I had been thinking of earlier. The secondary POE apparently has been incorporated into the Quadrajet since 1966, as I checked every one of them for it.
I've got a '66, '67, 3 '69's, a '70, the '72, '74, '75, and of course the 2 '77's, and a '79 as far as Cadillac carbs go. Only a few have the primary side POE system, which makes you wonder what the requirements were that made it necessary. This '72, one of the '77's, and the 79 were fitted with it. I remember the 72 came off of a Coupe Deville, and the 77 and 79 were both removed from rear wheel drive vehicles as well, but they were all used cars when I got them, so who knows what might have been done before I bought them.
I had never really paid much attention to how the carbs were designed and how they changed over the years before. I didn't have any source like this forum for information about it before, and until I tried using a Cadillac Quadrajet on a Chevrolet, never had another issue that I needed help with.
This is a great forum, great people, I'm glad I found out about it.
Rick
Cadman-iac:
--- Quote from: Kenth on January 05, 2026, 07:01:07 AM ---
And, POE arrived 1971 for Cadillac Qjets.
1971 POE was drilled right thru the choke housing wall for exit both primary and secondary when needed.
Later on only primary POE was used.
--- End quote ---
Kenth,
The secondary accelerator nozzles, are these considered the same as the POE system for the secondary side of the carb, or have I confused the two?
If so, where would the secondary POE be located exactly?
Rick
Kenth:
Sorry for the confusion on the 1971 and first type 1972 primary POE system, my bad.
POE should not be confused with secondary accelerator ports.
2:nd and 3:rd type 1972 Cadillac 4MV carburetors incorporate a fuel pull-over enrichment circuit to provide added enrichment and improved fuel control during higher engine speeds and caburetor flows.
Two calibrated holes, one in each primary bore, are located just ABOVE the choke valve and feed fuel from tubes that extend into the float bowl.
During high carburetor air flows, low pressure created in the air horn pulls fuel from the high speed fuel feeds, supplementing fuel flow from the primary main metering system.
The air bleeds formerly located in the air horn for the pull-over circuit, are eliminated.
The pull-over enrichment system begines to feed fuel at approximately 8 lbs of air per minute, and continues to feed at higher engine speeds to provide extra fuel necessary for good engine performance.
1971 and 1:st type 1972 models also use a fuel pull-over enrichment circuit but the two calibrated holes, one in each primary bore, and located BELOW the choke valve to provide added fuel enrichment for cold engine starting as well.
These units has air bleeds on opposite side, at the same height, of the feed holes in air horn wich was eliminated for later units. Those air bleeds were NOT ment to add fuel to the secondary port.
Note:
Standard, Limousine, El Dorado
1:st type are 7042230, 7042231 and 7042232
2:nd type are 7042233, 7042234 and 7042235
3:rd type are 7042236, 7042237 and 7042238
HTH
novadude:
Well, as usual, Kenth is correct. My memory was wrong on the year of my parts carb. I finally got around to looking at it, and it is a 7041xxx, not 7029xxx as I had remembered. It does have this system as described by Kenth above:
--- Quote ---1971 and 1st type 1972 models also use a fuel pull-over enrichment circuit but the two calibrated holes, one in each primary bore, and located BELOW the choke valve to provide added fuel enrichment for cold engine starting as well.
These units has air bleeds on opposite side, at the same height, of the feed holes in air horn which was eliminated for later units. Those air bleeds were NOT meant to add fuel to the secondary port."
--- End quote ---
Thanks for setting me straight!!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version