Edelbrock Carburetor Vacuum Lines - Defender Source
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  #1  
Old November 8th, 2011, 01:33 PM
Smirk1010
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Justin
1986 3.5 V8 Ninety
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Edelbrock Carburetor Vacuum Lines

I have done quite a bit of searching on D90 and elsewhere and I have not been able to find a good source that covers setting up all the vacuum/breather lines for an edelbrock carb as a replacement for a stock twin carb setup. I have seen a number of photos of the setup and they all seem to vary. What follows is what I have gathered. Please weigh in with your own opinions.


Stock Carb Setup:
I haven’t had the benefit of examining a stock twin carb setup, but from pictures and diagrams it appears that the rocker cover breathers are each attached to a vacuum port at the base of the carburetor closest to it. Each line has a flame trap. The rear crank case breather is attached to a port on the air filter inlet. This line has a check valve. The distributor vacuum advance is attached to a timed vacuum somewhere (?).

Edelbrock Carb Setup:
Seeing as the rocker cover breathers were originally attached to a carb vacuum port, I would assume they would share the edelbrock carb PCV vacuum port or brake booster port. The rear crank case breather should be attached to a port on the air filter inlet. The distributor vacuum advance should be attached to the timed vacuum port.


Has anyone tried this setup? Had issues? Is there a more effective setup?
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  #2  
Old November 8th, 2011, 02:06 PM
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Bill Adams
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There's a gazillion ways to do it. Generally speaking, you attach the brake servo line to the booster port. The breathers can go to a port on the air filter housing, assuming you have the big round kind which usually have a breather port built in. The diz vacuum advance to one of the ports on the front. Cap all the other vac ports.
I have a carb spacer with a vac port for the valve cover breathers on my boat engine. Works nice. Or get a carb spacer with nitrous jets...

The stock set up with the twin carbs is overly complex and weird.
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  #3  
Old November 8th, 2011, 03:00 PM
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mark kellgren
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carburetors suck! why don't you just swap in a used 3.9 from a Disco? I dread the thought of ever going back to my carb days with my CJ7 v8. uggh.
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  #4  
Old November 8th, 2011, 04:09 PM
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J. Michael McCaig
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I guess I'm old school but I love the edelbrock carb on my 4.6. Before this turns into a carb vs. efi thread...here are some links to carb manuals that I used for my installation which helped me choose which ports to use for the vacuum lines. The rocker cover breathers vent back to either the air cleaner or in my case to the adapter on top of the carb.

http://www.jegs.com/InstallationInst...0/350-1413.pdf

http://www.edelbrock.com/automotive_...ers_manual.pdf
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  #5  
Old November 8th, 2011, 05:50 PM
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David Short
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What Mike McCaig said.... take the valve cover breathers and route them back to the air cleaner housing.
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  #6  
Old November 8th, 2011, 08:15 PM
Smirk1010
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Justin
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Do you not use the PCV port for the breathers as it would provide too much vacuum as there is no PCV valve in place? I am not sure what kind of vacuum this port provides (manifold, timed, ...).
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  #7  
Old November 9th, 2011, 07:09 AM
Roverlab
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Trevor Griffiths
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right on, Justin. Hook the breathers to manifold vacuum and watch the engine oil make it's way into the combustion chambers!
Have a 3.5 110 here now that we're contemplating a full 3.9 injection set up or go the Edelbrock route. Previous Edlelbrock-ed 3.5's went very well, in my opinion. Fuel injection is nice to turn the key and go (well, most of the time). Carbs on a v8 sound cool.
How will we ever make a decision?
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  #8  
Old November 9th, 2011, 08:21 AM
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John B.
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Just don't plan on going off road with the Edelbrock. They don't like angles.
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  #9  
Old November 9th, 2011, 08:28 AM
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Bill Adams
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Quote:
Originally Posted by Red90
Just don't plan on going off road with the Edelbrock. They don't like angles.
You merely need install the spring loaded needle valve kit
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  #10  
Old November 9th, 2011, 09:03 AM
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J. Michael McCaig
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yup...added the spring loaded needle valve kit, dropped the float level a bit and she will idle down to 300rpm and pull like a train off-road on all kinds of angles no problem.
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Old November 9th, 2011, 10:07 AM
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Trevor Griffiths
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Is that a part from Edelbrock for their carb?
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  #12  
Old November 9th, 2011, 11:14 AM
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J. Michael McCaig
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Yes. Edelbrock part number for the off-road spring loaded needles and seats is #1465. See below:

http://www.edelbrock.com/automotive_...hun_perf.shtml

Installation here:

http://www.4wheeloffroad.com/techart...cal/index.html
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  #13  
Old November 9th, 2011, 12:27 PM
Smirk1010
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Justin
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I found a good article explaining the vacuum ports here:

http://www.lbfun.com/warehouse/tech_..._explained.pdf
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  #14  
Old November 22nd, 2017, 12:09 PM
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David
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Quote:
Originally Posted by LRover View Post
I guess I'm old school but I love the edelbrock carb on my 4.6. Before this turns into a carb vs. efi thread...here are some links to carb manuals that I used for my installation which helped me choose which ports to use for the vacuum lines. The rocker cover breathers vent back to either the air cleaner or in my case to the adapter on top of the carb.

http://www.jegs.com/InstallationInst...0/350-1413.pdf

http://www.edelbrock.com/automotive_...ers_manual.pdf
What brand is the adapter on top of the carb in this setup? Is still a common setup? I like the idea of retaining the stock 3.5 air cleaner.
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  #15  
Old November 22nd, 2017, 12:22 PM
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J. Michael McCaig
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Well I hate to admit it but the adapter is something I made myself out of an Adams Peanuts can with the fittings soldered on. When turned upside down, it just happen to fit on top of the carb perfectly. You can find adapters online. For example:

Spectre 757: Low Profile Air Intake 90° Bend Tube | JEGS
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