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Does anyone know if theres any modification that can be done to the 4.7 intake manifold like can be done to the 5.9 to make it flow better? ive searched and havent found an answer so i thought i would just put it out there and ask.
Hello, I realize that this thread is as old as the hills, but I figured I would post this here anyway just to see what other people think...
I have a 2000 dakota, recently swapped to the 68mm throttle body, and while I had the old one off, I noticed this:
so you can see where I circled on number 1, it doesn't seem like much but it still projects down behind the opening on the throttle body, and of course it wouldn't make much of a difference anyway, but it still blocks the airflow even if it is only a negligible difference, especially at part throttle. Regardless, I figured even 0.05% difference is still an improvement, so I grabbed it with some pliers to keep it from falling down in the intake and cut it off with a good, fresh utility knife blade. Was just wondering if anyone else has ever noticed this tab before, if it was behind the carburetor then I could see how a little turbulence might give better atomization, similar to a throttle body spacer, but it seems to serve no purpose here. Also, the two extra vacuum ports circled in number 2 project in more than I would like, further disrupting airflow, but to remove those you would need to take the manifold off in order to be able to use a dremel tool or something similar to grind them down and keep the plastic out of the engine. This is something I may do in the future since my manifold is absolutely filthy with oil sludge from a bad PCV valve, which also gunked up my IAT sensor which is located on one of the runners (I plan on relocating it for several reasons, especially since on later models this sensor is located before the throttle body so I figure they moved it for a reason, but one benefit is to further streamline and balance airflow within the header by removing every possible obstruction, this includes the IAT sensor.) Now I already know what you're thinking, if you want more flow just go to the HO intake, but frankly I want my torque down nice and low where I do all my driving and my primary goal is to optimize mileage and low rpm torque, any power gains are more than welcome but I don't want to do anything that could sacrifice MPG's. Here is a shot looking through the TB spacer (yes I know they don't do squat but it came with the truck and I like the way it makes it sound, so it stays ), besides I figure if it slightly increases the length of the manifold it could possibly shift the torque curve even more towards the lower rpms, but this is just theory.
It's kind of hard to see, but you can also see in the back where the vacuum ports stick through the inside of the manifold.
4.7L intake manifold modification
), besides I figure if it slightly increases the length of the manifold it could possibly shift the torque curve even more towards the lower rpms, but this is just theory.
