General Category > Quadrajet Carb Talk and Tips

Secondaries sticking

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Warriorautotech:
Hi all, im new here but ive always been a fan of the quadrajet. I run a dodge dakota pure stock on dirt and im having some odd isues with the secondary air doors. My engine is a 360 magnum with 89-92 308 tbi heads, factory dodge quadrajet intake and magnum 2.25 outlet exhaust manifolds, 68 340 manual cam, 221/227 duration at .050, .438/455 lift on 114 degree lsa. 1" 4 hole phenolic spacer under the carb and a 5" aluminum spacer between the carb and air cleaner. The carb is a mid 80s dodge heavy duty truck carb that ive worked over following ruggles recipe 2 in the book. The issue im having is that in mid turn when i start getting back on the throttle most of the time the secondaries wont open, from a dead stop they work better. The problem got a lot worse after i swapped to this current cam from a much smaller one. I have a front mounted sec vacuum pulloff comnected to b port above fuel.inlet. my theory is that the spacers create a high velocity venturi effect under the primaries which is not allowing the vacuum to drop below the primaries so the pulloff can release at 4500 rpm part throttle .i know that the engine runs much richer without the 5 inch spacer.  Im switching to a rearmounted pulloff connected to the rear vac port that pulls from under the secondaries which hopefully will fix this but i wanted some opinions from others. There are no binding issues at all in either the secondary throttle plates or air doors.
 The other issue im having is since cam swap i cant get enough fuel when secondaries do open, i have .041 rods and a b hanger at the moment with .036 secondary air tubes and my afrs are still around 15:1. Can i switch the secondary air bleed tubes to richen it up? I have a set of .025 tubes out of a  feedback carb i can use, but every recipe in cliffs book calls for .036. Thanks for any input

Warriorautotech:
I dont know why it cut my post off. Ill try again
Apparantly the forum computer doesnt like the degree symbol

Warriorautotech:
ill add that float level is at 1/4 and fuel pressure is a steady 6 psi at wot, holley racing mechanical pump and holley fuel pressure regulator

Warriorautotech:
no one has any input?

Mudsport96:
Just a guess, but you could run hose to a port on the manifold and see if that allows the secondary side to open. Also if the choke is not fully open it can lock out the secondaries

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