Retard Cam Timing With Offset Bushing - 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 05-28-2012, 07:28 PM
Registered User
 
Join Date: Apr 2012
Posts: 13
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Retard Cam Timing With Offset Bushing

I Need To Retard My Cam By About 2 Degrees. Which Direction Should The Thin Portion Of The Bushing Be Facing?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-28-2012, 11:59 PM
Registered User
 
Last photo:
Join Date: Mar 2008
Location: Ringgold, Ga.
Posts: 461
Wiki Edits: 0

Thanks: 1
Thanked 17 Times in 16 Posts
There is an infinitesimal number of positions the offset bushing can fit into the timing gear. You need to use a degree wheel to ensure it is done correctly, plus the timing gear has to be drilled out first before the bushing will fit into it.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-29-2012, 08:39 AM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
Look at the normal rotation direction of the crank and cam.

look at the cam timing gear

now Look at the cam pin, not the bushing.

To advance the cam, the cam pin leads the direction of rotation.

The various bushings degree value is only a rough guide.

Check how far the cam actually moves with the degree wheel.

Be sure to use a cam bolt locking plate to hold the bushing in place
and the cam bolts locked.
Ya they can come loose.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-29-2012, 10:31 AM
Registered User
 
Join Date: Apr 2012
Posts: 13
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Cam Pin And Bushings

I've Already Degreed The Cam And Came Up With An Actual Intake Lobe Center Of 107 Degrees And The Cam Card Says 106 Degrees. This Means I Have To Retard The Cam, Correct? So From What You're Saying The Pin Should Be Following The Normal Direction Of Engine Rotation By About 2 Degrees?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 05-29-2012, 10:42 AM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
No the cam is now 1deg retarded from the cam card spec.

its close enough, leave it alone.

Always work with the intake event closing point at .050" lifter rise
+/- 1 is fine.

the actual cam timing may not be a whole number

A 224 deg cam is often not actually 224deg @.050"

could be 223 16" or....

1 has 60 " 's (Minutes)

The number are often rounded off for simplicity.

+/- 1 deg is A OK.

Last edited by F-BIRD'88; 05-29-2012 at 10:52 AM.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 05-29-2012, 11:37 AM
Registered User
 
Join Date: Apr 2012
Posts: 13
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Abts Retard

Thank You Sir You've Explained A Lot.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 05-29-2012, 12:02 PM
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
It won't hurt to go 2 degrees advanced from where it is now (+1 degree advanced overall), it will tend to offset the chain stretch that happens to a new chain when it breaks in. It also won't hurt if you do nothing.

If you use a bushing, drill into the backside of the gear, don't drill all the way through the gear. Make the hole 0.010"-0.015" deeper than the bushing- this will capture the bushing, with no way for it to come loose.

Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 05-29-2012, 12:23 PM
engineczar's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: In Flowbench nirvana
Age: 52
Posts: 1,666
Wiki Edits: 0

Thanks: 6
Thanked 54 Times in 50 Posts
Another thing to remember is depending on how much you change the pin location you might need to slot the bolt holes. There's only so much clearance in them.
__________________
BSE Racing Engines
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-29-2012, 01:36 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
Quote:
Originally Posted by engineczar
Another thing to remember is depending on how much you change the pin location you might need to slot the bolt holes. There's only so much clearance in them.
Just drill the three cam bolt holes in the gear using the same dill bit used for the cam pin hole.

Don't forget the cam bolt locking plate.
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
retard or advance timing? J boy Engine 4 05-03-2010 09:04 AM
cam retard offset hundriver Engine 3 10-12-2009 07:38 PM
Timing Retard PAS55 Engine 3 03-24-2006 10:03 AM
cam advance/retard & dizzy timing wayneair Engine 5 12-14-2005 07:50 AM
Timing retard eight90 Hotrodding Basics 4 07-20-2005 10:20 PM


All times are GMT -6. The time now is 04:22 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.