Electronic QuadraJet and factory Electronic Spark Control

[johnny]

I looked at some reference material on the 'electronic' Q-jet. To use one would be an interesting exercise in getting it to work, as would an AFB or
a Holley. However, other than the accomplishment, I don't see where it would help things at all. The 'get-by' emissions carbs represented the worst
of both worlds. You've still got a carb which is dependent on airflow through a venturi to pull gas into the stream from an atmospheric float bowl
which can get hot and vaporize. But you've still got to hassle with a controller to make it work 'properly'. The 'recirculating' carbs that I've
seen merely return fuel to the tank when the float valve is closed, they don't pressure the float bowl. Consequently,other than cooler fuel in the
lines, there's no benefit and Weber sees you coming when you go to buy one. I'm like the old maid at the party, I'll dance with the one what brung
me. You go ahead though, and report back.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased

 

[gmc2000]

the HotRod mag article suggest they get that "worst of both worlds" rap for the same reason the regular quadrajet got a the bad rep., a
misunderstanding.

the E4MED, does not even have a 'controller' but it does have a perfect upgrade for cold drivability and another perfect upgrade for A/C idle speed.
two of the most common complaints of the original carbs Ive read here.

> The 'recirculating' carbs that I've seen merely return fuel to the tank when the float valve is closed, they don't pressure the float bowl.

Im pretty sure that the reasoning behind them. Weber (Weber-Marrelli now) is a huge OEM supplier, aftermarket is not their bread and butter.

my first American made carb was a Carter ThermoQuad that was OEM on an AMC Javelin. (before they were OEM on Ford and Chrysler) these would probably
be even better on the GMC than the latest QuadraJets due to the plastic bodies and the electronics in the latest ones:

https://carbkitsource.com/carbs/tech/Carter/TQ-index.html

http://dave78chieftain.com/Thermoquad/1982%20Thermoquad%20Service%20Manual.pdf

but that is straying a bit farther out into experimental territory. probably worth it though IMO

I plan to report back but dont hold your breath because all Ive got is a plan right now. lol

 

[johnny]

The '72 340 cars fitted a ThermoQuad.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased