Four Barrel Secondaries Question
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Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
Four Barrel Secondaries Question
Hi everyone,
Have the Holley 390 on my Bronco apart for a stripped fuel bowl bolt.
This time while I had it apart, I noticed that even with the primaries completely closed, the secondaries had quite a bit of travel.
As far as I know, the secondaries aren't supposed to be able to open AT ALL if the primaries are closed.
For those that know carbs, are the secondaries (on the right) in these pictures opening too much? If so, do I need to bend the arm to limit their travel?
A picture of the primaries and secondaries completely closed. A lot of travel left.
Primaries and secondaries completely closed.
These three pictures are to show how far the secondaries can open on their own with the primaries completely closed. Seems like a LOT to me.
Thoughts? Is this normal? Or are these just able to open up way too much whenever they want? The vacuum secondary actuator does keep them stable, so they don't wobble around, but I wouldn't want them to be open while I'm just cruising down the highway.
Have the Holley 390 on my Bronco apart for a stripped fuel bowl bolt.
This time while I had it apart, I noticed that even with the primaries completely closed, the secondaries had quite a bit of travel.
As far as I know, the secondaries aren't supposed to be able to open AT ALL if the primaries are closed.
For those that know carbs, are the secondaries (on the right) in these pictures opening too much? If so, do I need to bend the arm to limit their travel?
A picture of the primaries and secondaries completely closed. A lot of travel left.
Primaries and secondaries completely closed.
These three pictures are to show how far the secondaries can open on their own with the primaries completely closed. Seems like a LOT to me.
Thoughts? Is this normal? Or are these just able to open up way too much whenever they want? The vacuum secondary actuator does keep them stable, so they don't wobble around, but I wouldn't want them to be open while I'm just cruising down the highway.
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
I'm going to say not normal. Just sitting, engine off they should not open at all. When they open is controlled by vacuum and can be adjusted with diff springs. But I am by no means a carb expert.
