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Posts: 18
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2.7 vacuum advance question
I have a 914-6 with a 1976 2.7 liter 911 engine in it. I am running weber 40 IDAP's. The dizzy is of the vacuum advance type. I have two vacuum ports, 1 ooff the base of the carb on the #1 cylinder and the other of the base of the carb at the #4 cylinder. How should I have the vacuum advance hooked up? to one or with a tee to both? If one only which one? I really appreciate your help.
Thank you www.clr2cont.com
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05-30-2003, 07:43 PM
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That sound odd. What kind of intakes manifolds do you have? I my 75 914-6 with 2.7 it comes off number one. I have never seen two vacum ports. Did some one add one ?
Ben |
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06-02-2003, 08:59 PM
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its not a 2.0 six. it is a 911 1976 2.7 liter that originally was a CIS fuel injection. these must be after market webers on the motor. The vacuum ports are on the carbs right at the base.
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06-02-2003, 09:10 PM
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Location: SW PDX
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Huh. With PMO's, you rely on mechanical advance (no vacuum advance).
...I learn something new every day!
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Scott 74 914-6 2.7 |
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06-02-2003, 10:33 PM
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I have a 2.7 in mine. The manifolds are from my factory 2.0-6. There are no ports on the carbs, mine are in the manifolds at cyl #4 & 6. I put them together with a tee and then to the dist. This is how it was set up on the 2.0.
Eric
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Eric '76 914-6 2.7 Auto-x Toy '70 914-6 Orig., in resto |
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06-03-2003, 08:03 AM
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On your 2.7 is your dizzy a vacuum retard? Someone told me that was the cas on the 2.7 with the CIS fuelinjection.
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06-03-2003, 07:13 PM
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It depends on the model of distributor. Keep in mind that almost 99% of all 2.7 produced came with CIS. Mine was and most others were. I guess if I were you I would just plug one fitting on the manifold and run the other one to the vacum advance. If one of those fittings was left open you had a vacum leak and will have to readjust your carbs as far as idle and mixture .
Ben 75 914-6 2.7 carbs 77 911s 3.0 |
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06-04-2003, 04:46 AM
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I should also state that my vacum port is also of the manifold and not the carbs. I just reread the post and noticed that you mentioned that.
Ben |
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06-04-2003, 04:48 AM
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914 Geek
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I think you would want "ported vacuum" (taken from the carb throat near the progression holes) to run a vacuum advance. Anything from below the butterfly valve would be manifold vacuum, and would likely only be good to run a vacuum retard.
--DD
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Pelican Parts 914 Tech Support A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling |
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06-04-2003, 02:58 PM
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74 Porsche 914 2.0 
