Well, their toilets don't even spin the right way, so there's THAT.
Need help with edelbrock 1406 carb
- Thread starter 1968 Dart 270
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I do not know what Carter carb 6cyl Jeeps use....but I doubt very much it is a AFB, AVS, TQ. Most likely a 2 bbl; I have little experience with those so they may well be limited with fuel pressure.
Turk claims needle & seats are 'the same', post #100. Well have a look at the pics below & see if those floats look 'the same'. One is a Carter 4 bbl float, one is a Holley 4 bbl.
Much to learn from these pics from those who want to learn....
Notice how loooooong the C float is & how close the inlet needle is to the pivot. This creates tremendous leverage that allows high fuel pressure without flooding. Why would C bother to produce a fuel pressure v float level chart that includes 10 psi....if thei carbs cannot work with that pressure??????????????????????? Duh........
Looking at the H float, the stock one is quite short by comparison & will not withstand the pressure that the C float does.
In an attempt to increase fuel delivery by using higher fuel pressure, the Carb Shop made the longer float which..... gives more leverage.
Much to learn from these pics from those who want to learn....
Notice how loooooong the C float is & how close the inlet needle is to the pivot. This creates tremendous leverage that allows high fuel pressure without flooding. Why would C bother to produce a fuel pressure v float level chart that includes 10 psi....if thei carbs cannot work with that pressure??????????????????????? Duh........
Looking at the H float, the stock one is quite short by comparison & will not withstand the pressure that the C float does.
In an attempt to increase fuel delivery by using higher fuel pressure, the Carb Shop made the longer float which..... gives more leverage.
Newbomb Turk
Well-Known Member
Ok moron I’ll type it slower.
If your carb needs 10 psi you are fucked up. I’m not saying it won’t take it, I’m saying it’s ******* wrong.
Got it yet? It’s ******* wrong.
Now post a graph showing how much fu volume is lost at 10 psi.
God damn dude, figure it out.
He seems to not grasp that pressure fights AGAINST volume.
Newbomb Turk
Well-Known Member
And I get sick of his constant bullshit and not paying attention.
I never said you can’t run stupid fuel pressure like that.
I said and I’m saying it’s WRONG.
Whose to say you're running 8-10 PSI and hit a bump hard and slosh the fuel around in the bowls violently? You could very well make the needle lose its seal. It won't take "much" at that pressure so why even chance it? It's just a stupid argument.
Nice to see to see the duel feed option on the Edelbrock
And RRR, you need a refresher course in physics. Pressure & volume are two different entities. In terms of supplying fuel to a carb, there is no 'fighting' between the two. They work together. There would be no volume of fuel delivered to the carb without pressure.
Newbomb Turk
Well-Known Member
Right. But pressure is caused by RESTRICTION. A RESTRICTION reduces FLOW. The greater the RESTRICTION the lower the FLOW.
Again, if you are running more than 6.5 or maybe 7 psi on any carb you don’t need to.
There are videos all over the web showing what high fuel pressure does.
There are shreds of truth in both arguments. But the facts are that increased pressure increases fuel flow. Think of a water hose and nozzle. But the float only has to control the pressure at the inlet seat which is 0.110" in diameter. This is 0.009503 sq. in. in area so fuel PSI of 6 pounds/sq. in. yield 0.05702 lbs of pressure. Thus, the float only has to exert that much force on the needle to close the opening stopping fuel flow.
I can therefore see why changing fuel pressure is an effective means for adjusting fuel level in the bowl affecting A/F ratio instead of opening the carb and adjusting the float level. Not as scientific as changing needles/jets, but probably a way to tune for changing atmospheric conditions on the fly. This is probably easier done with an electric fuel pump and regulator than with a mechanical pump.
My Carter high performance pump puts out a steady 5.5-6 PSI which seems ideal for street applications. The only problem I have is the check valves get hard in E10 fuel which is the only premium available in Denver.
I can therefore see why changing fuel pressure is an effective means for adjusting fuel level in the bowl affecting A/F ratio instead of opening the carb and adjusting the float level. Not as scientific as changing needles/jets, but probably a way to tune for changing atmospheric conditions on the fly. This is probably easier done with an electric fuel pump and regulator than with a mechanical pump.
My Carter high performance pump puts out a steady 5.5-6 PSI which seems ideal for street applications. The only problem I have is the check valves get hard in E10 fuel which is the only premium available in Denver.
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