General Category > Quadrajet Carb Talk and Tips

Removing Idle Tubes

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Bigal442:
I have attempted to attach two pictures with this post. One picture shows the empty hole where the downtube is missing with the removed idle tube. The other picture shows my stuck idle tube with the adjacent normal downtube.

Are the downtubes pressed in like the idle tubes? Let me know if I am getting the terminology incorrect. I did order the HP kit and more from Cliff last week and hope to get it today. I am building this carb for a 70 BB vette. May have to call Cliff for downtube help.

Perhaps a dumb question... what do the downtube restrictions do? As I understand it, fuel comes up from the idle tubes which is then passed over to flow down through the downtubes. Since the idle tubes are drilled to a precise ID to control flow does the diameter of the downtube even matter?

Thanks for any insights.

Allen

429bbf:
what you are calling the down tubes would be idle channel restrictors . they are very important. they are so thin that you may have a piece of it still in the hole.you are correct the fuel as it is passed over as you say is also mixed with air from the idle air bleeds and then down the channel restrictors.these three things are very important to get right . they all work together.the little brass pieces are very thin and i feel some where out over time from dirty air filters . thats just my opinion.also from looking at your picture you drive the idle tube down to far and now its wedged. it won't be that hard to get out.fwiw

Bigal442:
Thanks for further clarification. One way or the other I should be able to extract the idle tube.

Can you recommend what I should do to fix my channel restrictor problem? Is there a new part to buy and how to fix it?

77cruiser:
Cliff has em, they have them here too.
http://quadrajetparts.com/rochester-quadrajet-parts-quadrajet-tubes-vents-c-128_36.html

Or buy some 8-32 brass set screws tap to fit and drill the size you need.

Bigal442:
Got some new channel restrictors from Cliff. They come out easily if you drill with a .106" bit (Cliff tip). The new ones install easily with a light tap. I drilled them to .055" after installing them. Got the carb back together and on the car today. Seems to run well in the garage. Needs some choke adjustment to up the cold idle. Also need the rain to go away so I can road test and tune. Fingers crossed  ;)

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