Edelbrock vacuum port confusion
#2794160
07/08/20 02:44 AM
07/08/20 02:44 AM
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Got myself an 70 318" Power Wagon. Someone put a 4-bbl Eddie on it with an AFB 9636S 625cfm carb on top. Have no idea of internals but you can hear it has a little more cam. Runs pretty good actually but you can hear it's more in it. Was guessing slow advance curve and rich jetting so I started from scratch. Put my gauge on the right hand vacuum port but there was zero. Hmm... tried the left just in case but same result. Sucked myself on the gauge and the needle moved. Put it back on the intake manifold port (right) and gave it gas and the needle started moving a little! What? Pulled the hose from the PCV-port and engine instantly died. All I can say is that this engine makes a lot of vacuum, can tell from the suction off the PCV hose when it came loose. Didn't have much time and and had a coolant leak so I stopped there. What is going on??
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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Re: Edelbrock vacuum port confusion
[Re: HP2]
#2794164
07/08/20 04:07 AM
07/08/20 04:07 AM
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Joined: Nov 2003
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3hundred
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the port on the passenger side is for the vacuum advance, the opposite port is for EGR. Both are "ported" ports, no vacuum at idle as the origin is above the throttle blades.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Edelbrock vacuum port confusion
[Re: 3hundred]
#2794227
07/08/20 10:03 AM
07/08/20 10:03 AM
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don't think it's an Edelbrock carb you have there, 9636 comes up as a pushrod set for Edelbrock. Probably a Carter Competition Series AFB 9396S. According to the info I have the small nipple closest to the linkage is full time vacuum, the small nipple closest to the choke is ported vacuum. Link to the Edelbrock carb manual, shows the same as the Carter as far as which nipple is what http://old.edelbrock.com/automotive/mc/carburetors/pdf/carb_owners_manual.pdf
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Re: Edelbrock vacuum port confusion
[Re: Sniper]
#2794237
07/08/20 10:17 AM
07/08/20 10:17 AM
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lewtot184
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don't think it's an Edelbrock carb you have there, 9636 comes up as a pushrod set for Edelbrock. Probably a Carter Competition Series AFB 9396S. According to the info I have the small nipple closest to the linkage is full time vacuum, the small nipple closest to the choke is ported vacuum. Link to the Edelbrock carb manual, shows the same as the Carter as far as which nipple is what http://old.edelbrock.com/automotive/mc/carburetors/pdf/carb_owners_manual.pdf you're correct. the nipple next to the linkage is full vacuum. ported vacuum is above the throttle blade (passenger side), full vacuum is below the throttle blade, (driver side). no vacuum from either says something is screwed up.
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Re: Edelbrock vacuum port confusion
[Re: lewtot184]
#2794244
07/08/20 10:30 AM
07/08/20 10:30 AM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
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don't think it's an Edelbrock carb you have there, 9636 comes up as a pushrod set for Edelbrock. Probably a Carter Competition Series AFB 9396S. According to the info I have the small nipple closest to the linkage is full time vacuum, the small nipple closest to the choke is ported vacuum. Link to the Edelbrock carb manual, shows the same as the Carter as far as which nipple is what http://old.edelbrock.com/automotive/mc/carburetors/pdf/carb_owners_manual.pdf you're correct. the nipple next to the linkage is full vacuum. ported vacuum is above the throttle blade (passenger side), full vacuum is below the throttle blade, (driver side). no vacuum from either says something is screwed up. This was a universal replacement / performance type carburetor. Note the two small nipples either side of the PCV, both are ported vacuum, the right for vacuum advance, the left for EGR, note 50 & 51.. Also note the electric choke and vapor return line.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Edelbrock vacuum port confusion
[Re: 3hundred]
#2794248
07/08/20 10:40 AM
07/08/20 10:40 AM
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This was a universal replacement / performance type carburetor. Note the two small nipples either side of the PCV, both are ported vacuum, the right for vacuum advance, the left for EGR, note 50 & 51.. Also note the electric choke and vapor return line.
Go look at your PDF, it shows the nipple on the linkage side (#51) as FULL TIME VACUUM, not ported. Number 50 in your PDF is listed as Ported Vacuum, exactly as I said. A simple visual also confirms the vacuum sourcing for either nipple, below the throttle shaft is full time (#51) and above the throttle shaft (#50) is ported.
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Re: Edelbrock vacuum port confusion
[Re: Sniper]
#2794420
07/08/20 05:02 PM
07/08/20 05:02 PM
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Joined: Nov 2003
Posts: 10,228 Colleyville
3hundred
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This was a universal replacement / performance type carburetor. Note the two small nipples either side of the PCV, both are ported vacuum, the right for vacuum advance, the left for EGR, note 50 & 51.. Also note the electric choke and vapor return line.
Go look at your PDF, it shows the nipple on the linkage side (#51) as FULL TIME VACUUM, not ported. Number 50 in your PDF is listed as Ported Vacuum, exactly as I said. A simple visual also confirms the vacuum sourcing for either nipple, below the throttle shaft is full time (#51) and above the throttle shaft (#50) is ported. That's an ERROR. I had one, The OP CONFIRMED there's no vacuum at idle on either port. it's a universal carb, EGR does NOT use full time vacuum. And yes I know that, carb 101. Look at the pic of the actual carb, both on the same level.
'68 Fury Convertible '69 300 Convertible '15 Durango 5.7 Hemi '16 300 S Hemi
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Re: Edelbrock vacuum port confusion
[Re: Sniper]
#2796568
07/14/20 03:26 PM
07/14/20 03:26 PM
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Joined: Sep 2004
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don't think it's an Edelbrock carb you have there, 9636 comes up as a pushrod set for Edelbrock. Probably a Carter Competition Series AFB 9396S. According to the info I have the small nipple closest to the linkage is full time vacuum, the small nipple closest to the choke is ported vacuum. Link to the Edelbrock carb manual, shows the same as the Carter as far as which nipple is what http://old.edelbrock.com/automotive/mc/carburetors/pdf/carb_owners_manual.pdf Sorry for my slow action. You are correct about AFB 9396S, my bad, but that's exactly what I have. Next thing is drivers side port. Exactly as you say it should have full time vacuum as it looks to be located under the butterflies. I does not. It has the same vacuum as the port to the left and that made me totally confused. Anyway, I used the big nipple in between (for PCV valve) and solved it that way. 12 in hg in D by the way. I will have the drivers side plugged and use the one on the pass side for distributor vacuum. But I'm still confused...
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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Re: Edelbrock vacuum port confusion
[Re: lewtot184]
#2796570
07/14/20 03:37 PM
07/14/20 03:37 PM
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i have a lower body from one of those carbs laying around and got looking at it. I know now why the port on the throttle side would/could be used as a timed port. the port is at the throttle blade, not under it. this is unlike the edelbrock carbs where the port is below the throttle blade. definitely could create some confusion due to the different locations of the tubes. anyhow, there is a small cup plug under the port passage that could be removed to create full manifold vacuum. whether the small rectangular orifice would need to be plugged or not i'm not sure. Thank you soo much for bringing the light to this mystery! Next thing I wanted to do was to remove that freaking carb and look at it but since you looked for me I don't have to The only little mystery remaining is why they made them that way?
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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Re: Edelbrock vacuum port confusion
[Re: 3hundred]
#2796575
07/14/20 03:44 PM
07/14/20 03:44 PM
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Joined: Sep 2004
Posts: 523 Right here
HP2
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This was a universal replacement / performance type carburetor. Note the two small nipples either side of the PCV, both are ported vacuum, the right for vacuum advance, the left for EGR, note 50 & 51.. Also note the electric choke and vapor return line.
Go look at your PDF, it shows the nipple on the linkage side (#51) as FULL TIME VACUUM, not ported. Number 50 in your PDF is listed as Ported Vacuum, exactly as I said. A simple visual also confirms the vacuum sourcing for either nipple, below the throttle shaft is full time (#51) and above the throttle shaft (#50) is ported. That's an ERROR. I had one, The OP CONFIRMED there's no vacuum at idle on either port. it's a universal carb, EGR does NOT use full time vacuum. And yes I know that, carb 101. Look at the pic of the actual carb, both on the same level. Calm down gent's! Look, my carb look very much like the one in the pic. It has the text Carter AFB - Competition Series though. It has the electric choke and the vapor return nipple (hose is not there anymore) It has the two nipples 51 and 50 - but none of them gives a vacuum signal at idle. The drivers side nipple sits lower than the pass side nipple and that why I started this thread, I was confused
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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