Quad carb setup information help
I've asked many questions about putting my TR5 intake and carbs together on my 408 Dart. Got a ton of great help here. But now its time for the next step.
I finally got all the fittings in place and sealed up. I have 6.5 psi of fuel pressure with switch on but engine not running and with engine running its holding right at 6 psi. Its winter here and I can't get the car out on the road because theres salt everywhere. But the car fired right up and actually settled into an idle better then it ever did with the single 4 bbl on it.
Now it seems rich. I'm using 2, 600 cmf holleys that are supposed to be performance carbs. Here's a few things about them. The factory jetting was 65's. Because of using them as a dual quad setup I down jetted them to 62's in the primarys. I also have 6.5 power valves. These carbs are mounted sideways. The front and rear bowls do not have adjustable float settings without taking the bowls off which i dont understand the reason for that if there performance carbs. Once the engine warmed up good I tried to adjust the air screw by turning it in but it made no difference going all the way in. I'm guessing its because the second carb over rides the adjusting? Again it sounds good and seems very responsive but the exhaust is very rich smelling.
I realise I can't do anything with the secondaries until I can get it on the road which is at least 2 months away once spring arrives.
My question is where do I start making any adjusting with the carbs. I could possibly have the floats a slight bit to high and maybe that's another reason turning the air screw made no difference.
I watched a video the other week about starting by balancing the carbs using an Edelbrock balancing tool which I have no problem buying and fitting up to balance the 2 out but is that the right place to start? Should the air screw made an idling difference? Does no change when I turned that one screw in mean another problem. With one carb I would be checking for vacuum leaks to start but not sure that its the same procedure.
I'm including a video if the site allows me. And of course it won't let me do the video. Its only 11 seconds long but it won't work. So here's some pics of what I got.
I'm ready to learn so throw some suggestions my way. And thanks for all the help.
Rod
I've asked many questions about putting my TR5 intake and carbs together on my 408 Dart. Got a ton of great help here. But now its time for the next step.
I finally got all the fittings in place and sealed up. I have 6.5 psi of fuel pressure with switch on but engine not running and with engine running its holding right at 6 psi. Its winter here and I can't get the car out on the road because theres salt everywhere. But the car fired right up and actually settled into an idle better then it ever did with the single 4 bbl on it.
Now it seems rich. I'm using 2, 600 cmf holleys that are supposed to be performance carbs. Here's a few things about them. The factory jetting was 65's. Because of using them as a dual quad setup I down jetted them to 62's in the primarys. I also have 6.5 power valves. These carbs are mounted sideways. The front and rear bowls do not have adjustable float settings without taking the bowls off which i dont understand the reason for that if there performance carbs. Once the engine warmed up good I tried to adjust the air screw by turning it in but it made no difference going all the way in. I'm guessing its because the second carb over rides the adjusting? Again it sounds good and seems very responsive but the exhaust is very rich smelling.
I realise I can't do anything with the secondaries until I can get it on the road which is at least 2 months away once spring arrives.
My question is where do I start making any adjusting with the carbs. I could possibly have the floats a slight bit to high and maybe that's another reason turning the air screw made no difference.
I watched a video the other week about starting by balancing the carbs using an Edelbrock balancing tool which I have no problem buying and fitting up to balance the 2 out but is that the right place to start? Should the air screw made an idling difference? Does no change when I turned that one screw in mean another problem. With one carb I would be checking for vacuum leaks to start but not sure that its the same procedure.
I'm including a video if the site allows me. And of course it won't let me do the video. Its only 11 seconds long but it won't work. So here's some pics of what I got.
I'm ready to learn so throw some suggestions my way. And thanks for all the help.
Rod