Hi,
I bought a Road Demon (525 cfm). We have put it on my 65 Mustang. I have set the float levels to below mid point and very close to the bottom line, I have set the 4 idle-mixture screws to the 1.5 turn from the closed position. I have set the idle screw after seeing a very high RPM idle when I started the car. The current situation is;
1) I have black smoke from the exhaust. (at idle and when I push the gas pedal. When I accelerate hard, there is too much black smoke)
2) The engine runs a bit rough at idle.
3) It stumbles for a moment when I push the gas pedal. (Then it starts to get better)
The car details are as follows:
289 cu in original engine
C-4 Transmission
Original intake manifold
Double exhaust with no modification (The thickness is 2 inches)
There is a spacer between the intake manifold and the carburetor
I have a electronic distributor (the brand is Proform)
I have NGK platinium spark plugs (They are brand new, we put them at the same time with the carb)
Previous carb was an Autolite 4300 and I know it was big for this setup, that's why I changed it. But I did not have any black smoke problems at idle. I just had some minor black smoke when I accelerated hard.
Please help me and get me through these problems.
I bought a Road Demon (525 cfm). We have put it on my 65 Mustang. I have set the float levels to below mid point and very close to the bottom line, I have set the 4 idle-mixture screws to the 1.5 turn from the closed position. I have set the idle screw after seeing a very high RPM idle when I started the car. The current situation is;
1) I have black smoke from the exhaust. (at idle and when I push the gas pedal. When I accelerate hard, there is too much black smoke)
2) The engine runs a bit rough at idle.
3) It stumbles for a moment when I push the gas pedal. (Then it starts to get better)
The car details are as follows:
289 cu in original engine
C-4 Transmission
Original intake manifold
Double exhaust with no modification (The thickness is 2 inches)
There is a spacer between the intake manifold and the carburetor
I have a electronic distributor (the brand is Proform)
I have NGK platinium spark plugs (They are brand new, we put them at the same time with the carb)
Previous carb was an Autolite 4300 and I know it was big for this setup, that's why I changed it. But I did not have any black smoke problems at idle. I just had some minor black smoke when I accelerated hard.
Please help me and get me through these problems.