Hi guys, Been doing some pondering about the intake tract, got an old carter AFB and a quadrajet on the shelf. Wondering what all tricks there are to get them to flow better. (Working up to designing/building a sheetmetal intake with 8 webers for a SBC.) Does the criss cross pattern on a throttle plate serve a purpose? What should I use to smooth out the casting flash, and little overhangs that are inside the throat on these things? Thanks... been something I've wanted to learn how to do for a while.
I bought this book awhile back and it had a whole section on improving the Quadrajet...up to 1200cfm if I remember correctly.
Moon has two different SBC intakes for Weber carbs. With a Chevy sheet metal intake fabrication is complicated by the need to precisely locate the distributor and the water passages.
Yup... Got a CNC mill up at work, gonna make flanges and some end plates so it all lines up. Cool book, I'll check it out.
Hello..I don't think smoothing or getting out the dings are of importance..remember that roughness and dings cause the air & fuel to bounce around which will give you better atomizing (sp)..to mix better.. Now that worth 4 cents.. Duane
You want smooth flow in the carb, Everything below the throttle plates should be slightly roughed up(80-120 grit)
Question... What do you guys think about the mesh screens for keeping fuel atomized? I like em just cause you can drop something down the throat and not have to pick it outa the piston and head...
Get that Vizard book! The Q-jet improvement article is amazing, first detailed cleanup of basically stock carb, then bigger throttles...huge increases in flow WITHOUT enlarging venturis, meaning more flow without the problems of too much carburetion. It also contains a very interesting buildup of an IR Chevy, using some kind of Weber Japanese clone carbs. Applying that flow article to a Stromberg or a 94 would be an interesting excercise...
Reminds me of the little "add on" gadget my old man tried on his '51 Ford way back when. It sat between the bottom of the carb. and the manifold. It was just a piece of "mesh screen" with a little propeller in the middle of each barrel. It was SUPPOSED to improve gas mileage; - by atomizing the fuel - but after using it a year, and keeping close records on fuel consumption - he "pitched" it! Said, "If anything fuel consumption INCREASED!!" (figured it got in the way!!)
So ... that would pretty much be the grandfather of that dumb "Turbonator." Sounds like the same old story.
Have pulled many of them off the top of pistons while looking at mangled cylinder bores on Harley motors....