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#1
02-01-2009, 01:12 PM
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Choke pulloff vacuum?
Ok, so help me out with a noob question..
What port should a quadrajet choke pulloff connect to - ported vacuum or thermal vacuum? Thanks all. |
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#2
02-01-2009, 01:43 PM
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What carb-#?
1974 and earlier Pontiac Q-jets uses only a primary choke pull-off connected to a full manifold vacuum source on floatbowl passenger side next to fuel inlet. 1975 and later Pontiac Q-jets also uses a primary pull-off and in addition to this a secondary choke pull-off controlled by a thermostatic valve. |
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#3
02-01-2009, 01:44 PM
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Manifold vacuum, or any source below the throttle plates when the engine is at idle speed. This will apply the choke pull-off at initial engine start-up and unload the choke flap to keep the engine from flooding out.....Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#4
02-01-2009, 04:46 PM
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Its a '76 quadrajet. So if I am getting this right I would use the middle port between the pcv and water ports?
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#5
02-01-2009, 04:54 PM
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Take a look here:
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#6
02-01-2009, 05:10 PM
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Mine looks different. See the red circle in the attached photo. What port does this get connected to?
Thanks... |
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#7
02-01-2009, 05:54 PM
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Quote:
__________________
North Dakotas fastest REAL GTO 10.10 @ 131 MPH in the 1/4 Hoping to get it back together some year. www.jandjrepairandrestoration |
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#8
02-01-2009, 06:34 PM
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Hooking it to the small vacuum fitting on the vacuum tee in the back will open the chokeblade too far with cold engine.
This is the secondary pull-off wich should be connected to the thermostatic valve. It was used for emission purposes but is really not needed so you can omit it if you like a cleaner look. |
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#9
02-02-2009, 08:49 AM
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Kenth, good advice, we NEVER install them unless it is a full restoration to every detail, they are not needed.....Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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