Timing Issue - 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 08-01-2006, 07:38 PM
Member
 
Join Date: Mar 2003
Location: Seattle, WA
Posts: 91
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Timing Issue

So I was working on my buddy's 68 chevelle over the weekend, putting on a demon 650 carb and edelbrock intake and comp headers. It is a 350 with cast iron heads port and polished, xe274 cam, and 10:1 compression or right around there. We went to set the timing after setting the carb and when you unplug the vacuum advance the idle changes but the timing does not. When you rev the engine up to set timing, the timing mark goes retarded the more you increase rpm. Shouldn't it advance the more you give it gas? I tried to set the timing by ear and when we drive it, it has a little stumble while cruising, like a misfire, just like the problem I have with my car. Freeway driving is worse, feels like a huge misfire. Any ideas?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-01-2006, 09:31 PM
batman09's Avatar
CLICK ON MY AVATAR
 
Join Date: Jul 2004
Location: Alameda ca... NorCal
Age: 45
Posts: 321
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Did you replug the vacuum port on the carb after you unplugged it?bm

Last edited by batman09; 08-01-2006 at 09:39 PM.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-01-2006, 09:41 PM
Member
 
Join Date: Mar 2003
Location: Seattle, WA
Posts: 91
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
yes, but that has nothing to do with the problem. Thanks Anyways.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-01-2006, 09:44 PM
batman09's Avatar
CLICK ON MY AVATAR
 
Join Date: Jul 2004
Location: Alameda ca... NorCal
Age: 45
Posts: 321
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What I meant is ....did you put a small rubber plug on the vacuum port?If not you basically have a vacuum leak.bm
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-01-2006, 09:52 PM
Member
 
Join Date: Mar 2003
Location: Seattle, WA
Posts: 91
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sorry, didn't mean to be rude. I now understand what you meant and I thought the exact same thing. I put a plug on the port and after that I checked around for vacuum leaks and found nothing. Thanks again.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-02-2006, 07:18 AM
Technical Support Barry Grant
 
Last photo:
Join Date: Jul 2003
Location: Dahlonega, GA
Posts: 1,503
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What type of ignition system are you using?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-02-2006, 01:17 PM
nitro_baller4692's Avatar
floppers forever
 
Join Date: Jun 2006
Location: illinois
Posts: 791
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
put a vacumm pump on the vacumm advance an pump it to see if it moves and holds vacumm.
do you have this hooked up to ported or manifold vacumm?
not being a smart a** just trying to help,so don't fell afended for the silly question.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 08-02-2006, 06:39 PM
Registered User
 
Join Date: May 2006
Location: Connecticut
Posts: 53
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
First thing to do is pull the dist. make sure the centrifical advance is not frozen or sticking and the vacuum can is working.
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
Vacuum adv.. underdog305 Engine 58 01-30-2007 11:19 AM
350 chevy timing tiresmoke55 Engine 7 01-14-2006 10:55 PM
Timing issue, I think Sk8Crash69 Engine 10 11-17-2005 11:42 AM
pontiac 350 timing issue Scooby333 Engine 5 01-14-2005 05:55 PM
Timing problem - Help MTMike Engine 1 11-13-2002 01:07 PM


All times are GMT -6. The time now is 05:13 PM.


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.