how much mechanical advance does a stock distributor have? - 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 11-20-2003, 11:42 PM
Member
 
Join Date: Nov 2003
Posts: 135
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
how much mechanical advance does a stock distributor have?

can someone tell me how much mechanical advance the average h.e.i distributor produces?? also, how much does the average stock vaccum advance pull? thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-21-2003, 01:20 AM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 37
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Plug your vacuum advance. Use an advance analyzing timing light and a tach. See how much the timing advances and what RPM it stops advancing at. Distributor parts can wear or might not have ever been right. It is better to check yours and find out for sure.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-21-2003, 07:25 AM
superrodder's Avatar
Member
 
Last photo:
Join Date: May 2003
Location: Kingston Ontario Canada
Posts: 174
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The advance curve of any stock distributor was tailored at the factory to suit the needs of the engine and chassis that it was originally installed in.There's to many combos of vacuum and mechanical advance to accurately say what you have.And as the distributor wears out the advance numbers will undoutedly change.
Check your vacuum advance by first disconnecting the vacuum hose and pluging it to avoid a vacuum leak.hook up your timing light and measure the initial advance,then reconnect the vacuum line to the distributor and measure the * of change at idle.The * of vacuum advance can be changed by changing the vacuum canister on the distributor.GM has made many different ones over the years so it is possable to find the one with the * of advance you need for your car.
the mechanical advance is a little harder to measure but a timing light,tach that you can read from under the hood,and a screwdriver are all that's needed.
first disconnect your vacuum advance hose and plug it.
then with the tach and timing light hooked up,start the engine and measure the base timing at IDLE.write this number down.
then with the screwdriver slowly turn the idle speed screw up on the carb and watch the timing change as the RPM goes up.
At the RPM point when the timing stops advancing,record the RPM reading and number of * of advance at it's most advanced setting.
Subtract the initial advance reading from your total advance number and this is your mechanical advance * at the given RPM it reached it.
Wasn't that easy!!!!!!!!
just one other thing,check your mechanical advance weights and springs to make sure they aren't sticking or broken as this is a common problem on HEI distributors.
to change the advance specs requires changing parts and remeasuring the * advance to make sure it will be what you need it to be.Don't just install parts and assume it will be correct.
I hope this explaines the procedure in enough detail to help.
I've found over the years that ignitions are the most missunderstood part of engine building.
GOOD LUCK
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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



All times are GMT -6. The time now is 03:34 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.