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WCFB
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   Forward Look Technical Discussions -> General Technical Discussion and TroubleshootingMessage format
 
ttotired
Posted 2016-08-31 5:36 PM (#520259 - in reply to #517176)
Subject: Re: WCFB



Expert 5K+

Posts: 7958
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Location: Perth Australia
Let me save your pain (or join in it)
I believe you have the same problem I have
Mine is a fully rebuilt 318, pistons are 40 up on stock, so the engines actually a bit bigger, I had a cam ground specifically for the 2x4 setup (cant remember the numbers, but its not "lumpy"), I also am running electronic ignition, advanced until its just under pinging
It has 2x 500 edelbrocks (brand new), 1 with an electric choke, 1 manual thats wired open (only need to choke 1 carb) and the throttle is set to operate both carbs the same

I have not messed around with the jetting yet, but I have tried staged linking the carbs, I have shifted the accelerator pump linkage in both carbs through all 3 holes a couple of times, tried without the air cleaner and have improved it, but not cured it by a long way, but one thing that did make a big difference was adjusting the kickdown.

Mine loves revs, once its up there, it goes fine, its just crap off the line and I am actually putting it down to loss of vacuum, but I have not tested that yet (havnt got around to it) but try putting a vacuum gauge in the car and go out and test it.

I cant offer much more than that, but I am watching

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RUSTORICHES
Posted 2017-01-11 10:14 PM (#531130 - in reply to #517176)
Subject: Re: WCFB


Veteran

Posts: 139
10025
Location: Alberta
You have to first ensure the carb jets are the same size and then calibrate the carbs by vacuum demand vs fuel demand, both carbs should read the same[balanced] assuming the carb linkages are set properly.If your running an automatic you may have reduce the torque convertor pressure to achieve vacuum vs fuel demands. Check out YOUTUBE for vacuum/fuel calibration you may find it useful. You may be experiencing some fuel supply pressure drop. Anyway that's my 2 bits worth of info I like I always say "If I can't explain the subject matter well enough for Gramma to understand then I don't know the subject"
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Chrispy
Posted 2017-01-12 11:30 AM (#531152 - in reply to #517176)
Subject: Re: WCFB



Extreme Veteran

Posts: 461
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Location: Colorado Springs, Colorado
2x4's are tough, look for a local shop with a dyno and an anaylizer and come with a nice assortment of Jets/rods for the carbs. You need to spend some serious time tuning those carbs in. You would need to do this even with the plymouth carbs. I'm going to be doing the same on my 392 even with a single carb. There is no magic bullet to fix your issue, just tuning that needs to be done.
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