Thread: encourage bbc 509ci

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Originally Posted by Alex-grand

I think when engine is working (car stay) acceleration is not affective, maybe Gasoline begins to boil? I mistake? Or not
My fuel line with fuel filter very hot when car is stop

Alex, I do not understand "I think when engine is working (car stay) acceleration is not effective".

Yes, you must prevent the fuel from getting hot in the fuel lines from the tank to the carburetor. When it gets hot, it creates what is called "vapor lock", which prevents fuel from flowing from the tank to the carburetor. Install insulation around the fuel lines from tank to carburetor to prevent this from happening, and particularly at any point of a heat source that is close to the line(s), such as exhaust pipe(s), exhaust headers, etc. Use a fuel pressure regulator to reduce fuel pressure to maximum 5 psi at the fuel bowl entry. More pressure than that will overpower the needle and seat in the bowl and allow the fuel pump to blow raw fuel into the intake manifold, creating a tuning nightmare that you will never be able to fix until you lower the pressure. Edelbrock carburetors are very sensitive to fuel pressure.

I'm trying to figure out where all the lines are going from and to on the front of the carburetor. An Edelbrock has 4 ports on it, one on the rear that is manifold vacuum that goes to the power brake booster. If the brake booster is operated by a line that connects directly to the intake manifold, then the rear outlet is plugged. Then there is a large intake manifold port in the center of the front that connects to a PCV valve in the valve cover. I don't see a PCV fitting on your aftermarket valve covers, so is there a PCV valve somewhere else in the system? It looks like the hose from the center port on the carburetor goes up to the bonnet at the air horn of the carburetor. Does it just connect there and is pulling in free air from the bonnet? If so, that's the same as just leaving the port open on the carburetor and creating a huge vacuum leak.

If there is no PCV at all, then you must provide another way for crankcase pressure to be relieved, otherwise if the motor is sealed up well, it will blow the oil dipstick out of its tube and begin breathing through the tube and creating quite a mess. Either that, or it will blow out a gasket and begin blowing oil all over the engine bay.

The small port on the left would be ported vacuum, normally connected to the distributor vacuum pod on a high-performance motor with an aftermarket cam.

The small port on the right would be manifold vacuum, normally connected to the automatic transmission modulator valve. ea

Please re-visit these lines and where they are supposed to go.
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Vacuum line is fine and correct installed.
Left go to the distributor
Right to the transmission
This my Pcv


Vacuum test(last month: Before replacement of camshaft)
BBC vacuum carb test
https://youtu.be/-KnqWNmny_M

I am going to install a new fuel pump with pressure gauge.
I have a new fuel regulator, To establish him?
Because edelbrock pump description said me: not required.
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Fuel pump and regulator Are ready to installation.
I bought carb calibration kit
What needles(nozzle, springs) to change?

The edelbrock.com said :

The Edelbrock Performer series #1406 & #1411 carburetors are calibrated lean for fuel economy and in most cases, will not function properly on Performer RPM & Torker style manifolds. Most people think you can just change the calibration of the carburetor and turn it into one of the Edelbrock performance carbs. This is not the case as the Venturi boosters are also different and Edelbrock does not sell Venturi booster separately. In most cases when using one of our economy style carbs on a Performer RPM or Torker syle intakes will cause hesitations and surging in the lower RPM range.

Maybe I must change a carburetor ?