Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Is there any way to correct a "U" shaped AFR curve?

(1/2) > >>

70GS455:
So dyno testing data is showing a "U" shaped AFR and BSFC curve vs RPM. Starts at 3500 rpm around 12.5 AFR, then dips slightly to 12.1 or 12.2 around 4300 then slowly climbs to 13.5 or .6 at 6000. BSFC shows a similar trend: starts off at .44 dips to .41 in the middle and climbs to .45 or so at the end. Is there a way to make this more straight? Or does it even matter? Manifold vacuum at the end is 2.1 to 2.3"

77cruiser:
What size N&S, how much pressure?

70GS455:
.135, 7 psi

lightning boy:
Just a thought, have you tried tapping the rear air bleeds for screw in and trying some different sizes. .028"or so.
Or maybe a set of custom machined sec. rods.

70GS455:

--- Quote from: lightning boy on December 01, 2020, 09:25:34 AM ---Just a thought, have you tried tapping the rear air bleeds for screw in and trying some different sizes. .028"or so.
Or maybe a set of custom machined sec. rods.

--- End quote ---

Good idea, would have to be a small screw as the tube OD is like 0.090". Thinking about soldering it and re drilling, then open up the bottom one

Navigation

[0] Message Index

[#] Next page