Carb and Alt 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
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 04-19-2010, 07:24 AM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Carb and Alt question

My one rochester quadrajet died on me yesterday. Saturday the car ran but i took it for a ride and when I got on it, it seemed like it wasn't getting enough fuel because it would die out and then idle. i came back and parked it until yesterday when I replaced the fuel filter in the carb and the in line clear one I have installed. NOTHING.... The car won't start and there is fuel right to the carb. I tried it without the carb filter, still nothing. Changed the carb and the car purrs like a kitten. What could be wrong? Could dirt have clogged the carb up completely? I tried blowing it out with compressed air.

ALSO....

I have a 3 wire alt and had it wired to work on 1 wire. The way I have it wired is one wire from the battery (via the starter) to the main terminal, then a line from the main terminal to one of the other two prongs. Is this the correct way? My car is not charging anymore. I have to make sure a wire didn't come loose but the car cranks fine and I have 12v (same as battery voltage) at the alternator so I doubt any did.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-19-2010, 08:12 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by maxpower_454
the car won't start and there is fuel right to the carb. I tried it without the carb filter, still nothing.
See if the carb is dry- you can tell easily by working the throttle while watching for the accelerator pump discharge- choke open so you can see. If there's NO fuel, the needle/seat has clogged. You can clear it (at least temporarily) by removing the fuel line and CAREFULLY blow pressure into the fuel port. DO NOT use compressor line pressure! If you do, all hell will break loose inside the carb and the float arms can be bent, etc. Just a gentle blow through it will probably dislodge whatever's clogging it.

If this doesn't work, or if you want a permanent fix, take the top off, and clean it out. Recheck the float level (~1/4", measured w/the "D"-clip held firmly in place, and at the mark across the toe of the float).

Quote:
I have a 3 wire alt and had it wired to work on 1 wire.
Does it have a voltage regulator compatible w/the 1-wire set-up? The 1-wire deal isn't particularly good, I wouldn't use it, personally.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-19-2010, 09:45 AM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Blowing it out with air didn't clear it so I guess I'll have to tear it apart. Where can I get a rebuild kit for a quardajet?


These questions are regarding my dirt track car that i race in a stock class. The common trick is to wire a 3 wire alt to work on 1 wire. I thought maybe some guys on here knew how to do this.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-19-2010, 10:05 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
AFA the 10 SI wiring goes, it's just a jumper from the "2" to the "BATT" terminal. The VR has to be self exciting.

Last edited by cobalt327; 04-19-2010 at 10:46 AM.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-19-2010, 11:18 AM
sbchevfreak's Avatar
Licenced Automotive Technician
 
Last photo:
Join Date: Feb 2004
Location: Land of big Easter eggs, Alberta
Age: 34
Posts: 1,607
Wiki Edits: 0

Thanks: 10
Thanked 9 Times in 9 Posts
You need to have a momentary 12v to the light pin on startup, plus the jumper to the other pin. These will lose "residual magnetism" without that feed.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-20-2010, 05:20 AM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Not sure what you mean by that Whic pin is #1 and 2? Which is the light pin?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-21-2010, 06:46 AM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
.....................
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-21-2010, 04:33 PM
sbchevfreak's Avatar
Licenced Automotive Technician
 
Last photo:
Join Date: Feb 2004
Location: Land of big Easter eggs, Alberta
Age: 34
Posts: 1,607
Wiki Edits: 0

Thanks: 10
Thanked 9 Times in 9 Posts
Quote:
The way I have it wired is one wire from the battery (via the starter) to the main terminal, then a line from the main terminal to one of the other two prongs

You need momentary voltage to the other pin. You have a battery wire to the main lug, then one from the main terminal to the field pin, and there is only one left. It needs a momentary 12v to "wake up." I ran into this alot on oilfield engines. Everything oilfield I worked on had a delco 10si alternator on it, and I had to add this momentary feed to many, many of them. I used either a diode and a wire from the start wire, or a relay energized by the start wire. Either works, but the diode wire is simpler to wire, and less expensive. If you don't do a diode/relay, as soon as the engine starts, 12v goes back to the start terminal on the starter, and trys to engage it while the engine is running.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 04-21-2010, 05:27 PM
Registered User
 
Last photo:
Join Date: Jan 2007
Location: canada
Posts: 564
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
http://www.madelectrical.com/electri...esensing.shtml
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 04-23-2010, 08:09 PM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So if I just hook a diode from the pin that is connected to the main terminal (and battery) to the empty terminal it should work? Obviously I need the diode facing the right way but I can handle that
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 04-26-2010, 06:10 AM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Anyone??????????
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 04-26-2010, 07:11 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
If you have a self exciting regulator, usually a quick rev of the engine is enough to kick start the alternator.

A one wire alternator will not 'kick off' below around 1500 RPM ordinarily (and could be higher), so you might want to look for a smaller (overdrive) pulley if this becomes a problem.

Once the alternator is started, it will remain active until the engine is shut off, regardless of RPM.

Good luck.

Last edited by cobalt327; 04-26-2010 at 12:28 PM.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 04-27-2010, 06:57 AM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I don't have a 1 wire alt, I have a 3 wire. I tried touching a wire from the empty pin to the battery terminal momentarily and the alternator still did not start charging. Nothing happened. I will try a diode this weekend but I don't this will be any different. Am I missing something? here's a little diagram of what i plan on doing. Is this correct?


Last edited by maxpower_454; 04-27-2010 at 07:07 AM.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 04-27-2010, 12:52 PM
Registered User
 
Last photo:
Join Date: Dec 2008
Location: USA
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ANyone????????????????
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 04-27-2010, 04:28 PM
Registered User
 
Last photo:
Join Date: Jan 2007
Location: canada
Posts: 564
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
if you tried the alt like that and it doesn't work, its likely NFG
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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
Alt Gauge Reading dcpky Electrical 1 11-02-2008 10:02 AM
From EFI to carb on a 5.0? Fat_46 Engine 5 06-28-2005 01:06 PM
fuel inj-to- carb swap,HELP!! handyman Engine 3 09-21-2004 09:30 PM


All times are GMT -6. The time now is 05:38 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.