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The Role of the Booster

1:25
28:21
403.9K views

At 1:25 in

Carburetors Are WAY Smarter Than You Think! Tuning Guru Bill Pink Shows Us Why (Carb vs EFI)

What happens here

Bill Pink explains the function of the booster in a carburetor. The booster is a device that measures airflow to pull fuel from the central hole. Air flowing through the booster creates a low-pressure area, drawing fuel from the fuel bowl, through the main jets, and into the main well. The host highlights that the size and design of the fuel holes and the presence of 'back cuts' in the booster significantly impact the fuel signal, with back cuts creating a harder, sooner signal.

Goal: Learn how the booster measures airflow and pulls fuel in a carburetor.

Tools and materials

  • Modified Carburetor Booster — Showing how modifications can enhance fuel signal and responsiveness
  • Standard Carburetor Booster — Demonstrating the basic function of a booster in fuel delivery

What they say

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it all works and correlates together. This is a carburetor that's widely used and out here on the dirt cars or out asphalt cars. It's the closest thing to a street carburetor. Like we talked about, the carburetors only know what's underneath them. They supply what air fuel ratio they need. If you don't have the booster exactly aligned in the board, the booster is actually the device that will measure the air flow going through it that pulls a fuel out of the center hole and through the booster. Now you air going through that center hole, creates a low pressure and pulls Yeah. fuel. Yeah. And then it all comes from the the fuel bowl, then the main jets and up the main well. And you can change the fuel hole size. So many tuning aspects of a booster. This one here, we got a little bit of a back cut put in the back side of that. Mhm. This way it creates a harder signal sooner where if you look at these, these have a tremendous amount of signal because of that crossbar. Now, this one is one that we've modified. So, you can see the difference between those two. And these I had machined at my dad's engine shop in Vanise, California. Now, if you look at the center of the booster where the crossbar is, there are some series that say that that bar has to stay intact. Well, we left it intact. Engineered a little bit. Just a little bit. And the the bottom of the stem has been CNCed and the sides have been CNCed to where it's been narrowed. So it's not the same finish as you can see. Yeah, it's a lot different. Then you go to the NASCAR where they got the Camping World Series or the Infinity Cup. We call it the Bush where they allow you to do pretty much whatever you want. So it's narrowed down to 300,000. We got a Vshape in the bottom of it to help pull air around it. Using CFD you can study

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