which carburetor to use
Thread Starter
Instructor
Joined: Jun 2002
Posts: 191
Likes: 0
From: Hillsboro OR
which carburetor to use
For the past few years, I have been attempting to get a fuel injection system (removed from a 90 chevy van) to work properly on my 73 big block. It works pretty well now, but not quite right, and I am getting tired of tinkering with it, so I am going to put a carburetor back on for a while. I have also put in a 700R4 transmission.
My question: What carburetor do people suggest for this car? I haven't done a whole lot to the engine, other than port/polish and a moderate cam. I'd like electric choke, and of course, the 700R4 hook-up. It is for street use only, so vacuum secondaries. Also, probably needs to be spreadbore since it has an original dual plane manifold on it. I don't have the original Quadrajet anymore.
Suggestions welcome!
My question: What carburetor do people suggest for this car? I haven't done a whole lot to the engine, other than port/polish and a moderate cam. I'd like electric choke, and of course, the 700R4 hook-up. It is for street use only, so vacuum secondaries. Also, probably needs to be spreadbore since it has an original dual plane manifold on it. I don't have the original Quadrajet anymore.
Suggestions welcome!
Thread Starter
Instructor
Joined: Jun 2002
Posts: 191
Likes: 0
From: Hillsboro OR
I guess I have gotten spoiled by the fuel injection, but I don't like the delay till the secondaries open. With fuel injection, you get instant power when you push the pedal, whereas with the quadrajet, it seems that there was several milliseconds of delay before the power was there. I'm hoping to find a carb that will be as good as the fuel injection was.
Drifting
Joined: Jul 2003
Posts: 1,253
Likes: 1
From: East China MI
with you on the 750.
Originally Posted by Yellow73BB
I guess I have gotten spoiled by the fuel injection, but I don't like the delay till the secondaries open. With fuel injection, you get instant power when you push the pedal, whereas with the quadrajet, it seems that there was several milliseconds of delay before the power was there. I'm hoping to find a carb that will be as good as the fuel injection was.
I have a little more motor than you, but it is carburated and the response is instantaneous from 0 to red line. I prefer the mechanicals.
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Thread Starter
Instructor
Joined: Jun 2002
Posts: 191
Likes: 0
From: Hillsboro OR
Yup, strange. Maybe I don't want vacuum secondaries. I suppose that is where the delay is coming from? I guess I didn't really think about where in the process the delay was coming from, and just attributed it to the quadrajet. I just remember the great feeling the first time I ran fuel injection on the car.
Does the "proper setup" eliminate that delay, and time the secondary fuel delivery with load or what?
Does the "proper setup" eliminate that delay, and time the secondary fuel delivery with load or what?
Drifting
Joined: Jul 2003
Posts: 1,253
Likes: 1
From: East China MI
Originally Posted by Yellow73BB
Yup, strange. Maybe I don't want vacuum secondaries. I suppose that is where the delay is coming from? I guess I didn't really think about where in the process the delay was coming from, and just attributed it to the quadrajet. I just remember the great feeling the first time I ran fuel injection on the car.
Does the "proper setup" eliminate that delay, and time the secondary fuel delivery with load or what?
Does the "proper setup" eliminate that delay, and time the secondary fuel delivery with load or what?
The advantage of mechanical is the assurance of fully opened secondaries, which is always questionable with vacuum, and driver control.
The advantage of vacuum is the ability to tune for any condition you want. For example, pure stock racers tune the vacuum carbs to hold the secondaries closed longer to give them traction out of the hole with bias ply tires. You could go the other way. Whatever you want.
