Making Sense of the Classic Downdraft Carb
If you've ever popped the hood of a vintage car or an old truck and seen a chunky metal unit sitting right on top of the intake manifold, you're looking at a downdraft carb. It's arguably the most common type of carburetor you'll run into if you spend any time tinkering with engines built before the mid-80s. The design is pretty straightforward: air comes in through the top, mixes with fuel inside the body, and gravity helps pull that mixture straight down into the engine's cylinders. ...