i have a 289 with a mild cam, petronix electronic ignition in the o.g. distributer, with an edelbrock 4 barrel on aluminum manifold. i just got the car, a 67 galaxie 500, and previous owner wasn't sure what cam he had but it was mild. i'm not sure what the carb. size is either, like i said it's new. the problem is that there is a dead spot when i accelerate from a stop. other than that it drives fine. i have adjusted the cab a hundred times and have gotten it better but it doesn't go away. i have a few theories but i'm not sure. i think or it has been suggested to me that a) the springs in the dist. are not letting it advance or are causing it to advance too much during acceleration, buy it only does it from a stop. b) i just cannot get the adjustment right, although i think i've gotten it real close to where it should be, c) the accelerator pump it bad, but the carb is supposed to be and looks pretty new, d) "edelbrocks just plain ****" , according to previous owner, although i have a buddy that swears by them and has for over 20 years, e) you tell me. i'm not a carb guy and spent the last 6 years on a single barrel straight 6 falcon that ran like a champ, at least engine wise. any suggestions would help, it is my daily driver and i'd love to get past this to concentrate on the other 101 things that need attention on this car.
On my warmed 302 I went two steps lighter on the springs and one or two steps richer on the rods. Cured the tip-in hesitation. Get a spring & rod tuning kit. Instructions comes with. If you already have been down that road then you should just replace the accellerator pump diaphram since you suspect it's bad. The shot on the Ebrock is not that strong. I don't like Edelbrocks because the accellerator pump well dries up in a week without driving. But an electric fuel pump helps with that. Otherwise they are fine. I prefer Holleys but the AFB design is OK.
Not enough info. Is it flat just off idle from a stop? Is it flat just after off idle? is it flat in the middle? If it flat just off idle from a stop you are not getting enough squirt to overcome the sudden opening of the ****erfly's. Adjust the accelerator pump
thanks everyone for your responses. i have been looking into it and i am 99% sure i know the problem. i have an edelbrock 1411 which is 750 cfm's. by everything i have just read, that is way too much carb for my 289, mild cam or not. i should be pushing 556 cfm's according to a cfm calculator i found on carbs unlimited, so would i want a 1405 or 1406 , which push 600 cfm or a 1404, which only pushes 500 cfm's be better. btw i really dont feel giddy abou replacing a new $300 carb right now, but it doesnt seem i have any other choice, what do you guys think?
now i just read that i should choose a carb that is rated at 110 to 130% higher cfm's than my engine requires, the more i learn the dumber i feel! your thoughts?
Do you have the old carb around? If you have the old Autolite around and it worked, pop it back on to see if things get better. Bob
Before buying a new carb, check your va***e advance. Disconect line to dist. and set timming(more than stock,2-6 degrees maybe, you may have to try different settings) then with engine running,temporally connect va***e line to manifold va***e and see if the timming advances, if it doesnt,you need a new va***e advance diaphram, if it does advance,good, then reconnect the va***e line to ported va***e(no va***e at idle,va***e when you open the throttle). Also as said check your accel pump, nice squirt,no delay or dribble.And a smaller carb would be better,but you should be able to get this one to work. Good luck, Tom.
750 cfm is ALOT for a 289 and typically the edelbrock wouldn't exactly be my choice on a Ford. Things you can try are to drop the accel. pump linkage to the bottom hole because it may be feeding too much off idle. Next you can pick up a spring kit for it and install shorter springs and then retune the carb and also reset your timing for best advance . Good luck
This. I have suffered from it for decades. Based on my reading in the dim and distant past, it sounds like you have way too much carb for this engine. Best wishes with getting it sorted out.
You should be running a 1405 or 1406 carb on that motor, those are both 600cfm and better suited to the 289. There have been some Pertronix issues that have come up and you may be experiancing some of this. The first series Pertronix are usually pretty good, the later series have had some problems. One thing you need to make sure of is that the pertonix is getting 12volts all the time. Most Fords have a resistor wire for the stock ignition that steps down the voltage to 6-7 volts. If the goober who put the car together did not byp*** the resistor wire with a "normal" wire, the ignition will do some crazy things....Do a google search on this, Mustang guys have been dealing with this for years....Just a thought. BTW... I call the guy a "goober" as anyone who would put a 750 cfm carb on an otherwise stock 289, then complain the car runs like ****, then about how bad the carb is, well, he has his head up his *** ..... Edelbrocks are great carbs, easy to tune and can run really crisp.... Tom
I think a properly sized carb would be a good start a 600 vac secondary holley or even something a little smaller would be good I have seen a couple edelbrock carbs work very well but even with careful tuning most are disappointing at best Holleys are better
Smaller is better sometimes, I've had Holleys in the 500 CFM range work well for me. I'm also a big Holley fan, easy to re-jet, overhaul and generally work on. Bob
A 600 cfm or 650 cfm should help your issue a bit. I have a friend that has several galaxies, and has one with most of the ford mills in them. He did have an issue with his pertronix, he will never use one again. But I am not here to bash it, as most people here have good results. I will not use one, as the Ford Duraspark is hotter than the original pertronix, and I am happy with it. Rrgardless of which it is, you will never get good performance with an engine that is way over carburated. Good luck in tracking the problem and eliminating it.
the more i talk to friends and read the more im convinced to run a 1404-05 or 06, preferably an 04, but for now i dont have the cash. the guy i got the car from gave me a motorcraft 4 barrel that he says needs rebuilding and just looking at it looks a bit rough but doable, is it worth doing? i need to check the numbers to see what cfm's it has obviously but if it is the right one are motorcraft any good? and this 1411 is pretty new, how much should i sell it for, i was thinking $100 -&150, as they have them for around $300 online
Have a similar setup in my '50 F1 ... stock 289 with 1406 Edelbrock and Pertronix Ignitor. Also had an acceleration stumble. Did the same adjustments with springs/rods described by 58Custom and for good measure, replaced accelerator pump. Has run great ever since.
Check out the new Hot Rod magazine this month.3 pages on your problem of carb and distributer. Different engine but same problem. With pictures ,even.
The Motocraft carbs were pretty good. Get a decent kit for it and rebuild it, they're real simple. Bob
A friend of mine runs a 600 edelbrock on his 400 SBC, and it does very well. 750 on a 289 is too big, end of story. I'm not a pro now, but I was before I changed jobs. Sell the 750 and use that money for the 600 cfm. Edelbrocks are good carbs, and used 600 cfm units should be simple to find. You could offer a trade 600 for 750. There's lots of ways to get a different carb. Like the guy said "Read, Learn, Buy a book..."
I had a autolite 2100 on my 289 in my mustang with a petronix unit and it was great. Mine was stock with just an upgraded exhaust of flowmaster 40's with stock manifolds. . The 4100 seems like a great carb for a 4 barrel. It is a smaller motor and does not need a lot of cfm in a carb.
ha! you wont believe it! i put a holley 500 on and the car runs beautifully, now the rear main seal is leaking like a civ. GOOD TIMES!
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