I need some Edelbrock 1406 install pointers
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Laughing Gas
Joined: Sep 2012
Posts: 1,100
Likes: 6
From: Georgia
Yeah, I haven't changed anything that isn't shown in the photos. Well, other than the front bowl vent line, which I capped the same as the one pictured.
FTE Legend
Joined: Jul 2010
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From: Northeast, OK
If you want to vent the vapors from the canister that come from the tank then you don't want to cap it. If you tee into B you will vent only above idle, which I think is best. If you tee into C you will vent even at idle, and that could upset the idle mix as I assume the VCV is controlled by temp, so you'll get the vapor only when the engine is warm.
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Laughing Gas
Joined: Sep 2012
Posts: 1,100
Likes: 6
From: Georgia
I connected ? to B with a tee that came with the Edelbrock.
The throttle seems to work smoothly with no binding, which I was a little worried about reusing the old 1/4" thick spacer/gasket.
It seems to run pretty well. Idle is high so I need to adjust it. I also need to check for vacuum leaks. It seems to lope a little when it's idling down the road, but that may be partly because the idle is too high.
Thanks for everyone's help. I haven't done a carburetor conversion in about 30 years.
The throttle seems to work smoothly with no binding, which I was a little worried about reusing the old 1/4" thick spacer/gasket.
It seems to run pretty well. Idle is high so I need to adjust it. I also need to check for vacuum leaks. It seems to lope a little when it's idling down the road, but that may be partly because the idle is too high.
Thanks for everyone's help. I haven't done a carburetor conversion in about 30 years.
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Laughing Gas
Joined: Sep 2012
Posts: 1,100
Likes: 6
From: Georgia
Air Screw?
For the life of me I can't find the "Air Screw" on my 1406.
This is what page 11 of the manual (http://www.edelbrock.com/automotive_...ers_manual.pdf) says for adjusting idle.
I've even searched Edelbrock's site.
I've also looked through the parts list, http://www.edelbrock.com/automotive_...order_form.pdf and can't find reference to an air screw.
So what do lines 3, 5, 7 and 10 actually refer to? The idle speed screw at the throttle linkage?
This is what page 11 of the manual (http://www.edelbrock.com/automotive_...ers_manual.pdf) says for adjusting idle.
- Fully warm engine and ensure choke is fully open.
- Air cleaner in place.
- Set desired speed with the air screw.
- Adjust the IMS on ONE side to get the maximum possible RPM. Do not go rich beyond the maximum speed point.
- If the above changed the idle speed more than 40 RPM, then readjust the speed.
- Adjust the side OPPOSITE of that in Step 4 to get maximum RPM.
- Reset the speed.
- Carefully trim each IMS to again get the maximum idle RPM.
- Go leaner just enough to get a 20 RPM drop in speed.
- Reset the speed to the desired RPM.
- This is a Lean-Best Idle Set. Setting richer than this will not improve idle quality or performance, but could tend to foul plugs.
I've even searched Edelbrock's site.
I've also looked through the parts list, http://www.edelbrock.com/automotive_...order_form.pdf and can't find reference to an air screw.
So what do lines 3, 5, 7 and 10 actually refer to? The idle speed screw at the throttle linkage?
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
Well, I've read that a dozen times over the years and never realized what it said. But, when they say "air screw" they are referring to the idle speed screw. Why they call it that I don't know, but it fits with lines 3, 5, & 7.
Last edited by Gary Lewis; Nov 10, 2013 at 07:38 PM. Reason: fixed mistake
Moderator
Joined: Jan 2001
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From: Virginia
I am looking in the above manual(the link) and on page 6 of the manual(page 7 of the pdf file) they do state in the paragraph right before the 11 steps that the idle air screw is the throttle stop adjustment. It controls how much the throttle butterflies are shut at idle, and that determines how much air is going by at idle.
They call the two screws on the front of the carb the idle mixture screws, they control the amount of fuel and air getting past to the engine at idle. If you read the explanation of how the idle circuit works a few pages back, they mix air and fuel together or they call it "emulsify" them together and then send that down to the adjustment screws.
They call the two screws on the front of the carb the idle mixture screws, they control the amount of fuel and air getting past to the engine at idle. If you read the explanation of how the idle circuit works a few pages back, they mix air and fuel together or they call it "emulsify" them together and then send that down to the adjustment screws.
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Yes, when you know how the carb works and that only air is flowing past them at idle speed it does make sense. But the rest of the world calls it something else, including idle speed and throttle stop screw, so my beef is why invent a new term. Anyway, problem solved.
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