Quick Q-Jet Question - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 06-17-2010, 07:09 PM
Registered User
Last photo:
Join Date: Jan 2009
Location: pothole rd
Posts: 118
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quick Q-Jet Question

I have this brand new quadrajet I want to put on my SBC but it's different than the others I've seen. What is this vacuum canister on the back for? It looks like it keeps the secondaries from opening under high vacuum but I'm not sure. Where do I plumb the vacuum line to? Also, what is this huge hose line on the choke control?

Uploaded with ImageShack.us

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 06-17-2010, 07:51 PM
airboat's Avatar
Registered User
Last photo:
Join Date: Mar 2006
Location: Canada
Posts: 286
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It's been a while but I think they used to run it through a temp switch to prevent secondarys from opening when cold. The large tube off the choke housing went to a heat stove in the intake manifold exhaust crossover heat passage with the clean air port for it at the top rear center of the carb. You will probably need to try an electric choke coil and wire it up for your choke to come off. Most performance intakes are set up for a divorced choke setup with the choke coil bolted to the intake and just a rod to the carb.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-17-2010, 07:57 PM
cobalt327's Avatar
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
The vacuum can is called a rear or secondary vacuum break assembly. The vacuum port gets manifold vacuum.

The choke has a hot air port, this is plumbed to a source of heat,usually at the exhaust crossover to cause the choke to open. Heat is drawn into the housing by a small vacuum supply hole located inside the choke housing.

The metal tube that connects to the choke housing most always had a length of fiberglass-looking insulation tubing covering it.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Quick help with paint question. 13th_Disciple Body - Exterior 16 07-29-2005 08:33 AM
Quick oil pressure question. oldschoolrods Engine 8 05-11-2005 08:51 PM
Quick Application Question. MontegoMX Body - Exterior 4 03-14-2005 03:15 PM
Quick Question Silentlion_69 Hotrodders Site Suggestions and Help 0 11-30-2004 07:23 AM
455 jet boat question propaniac Engine 12 03-24-2004 05:25 AM

All times are GMT -6. The time now is 06:42 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.