Cam break-in initial timing help on SBC - 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 08-25-2008, 05:08 AM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
Cam break-in initial timing help on SBC

As per thread title. I have a 355 SBC with Comp XE274 cam, Edelbrock 600cfm carb, Performer RPM intake and HEI ignition. I've provisionally turned the engine to 14* BTDC. Think this is about right? Want it to start in a hurry. I know about setting the timing with a dial-back light with the engine running, but I'm just after a good initial timing for that first start.

Thanks.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-25-2008, 07:22 AM
Guy Hiltz's Avatar
Member
 
Last photo:
Join Date: Sep 2005
Location: Nova Scotia Canada
Posts: 1,004
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
That should put you close enough to get it running.If thats a stock HEI distributor,I think they have around 22-24 degrees of advance built in,so that should put you around 36-38 total.
Guy
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-25-2008, 07:26 AM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,546
Wiki Edits: 0

Thanks: 3
Thanked 331 Times in 328 Posts
You want to run the engine at about 3000rpm for a good 20 to 30 minutes.
Set the distributor hold down bolt so that the distributor is snug but you can still turn it with some effort. get set up with the timing light installed and ready all coolant installed , rockers adjusted properly etc etc. Fire it quickly and bring it to 3000rpm, set the timing with vac advance disconnected, to 32-34deg BTDC at 3000rpm. Do not let it idle for the first 20 minutes. If something is not right shut it off and fix it. Restart and hold again at 3000rpm.
Do not let it overheat, but do not baby it.
You must hold the rpm high for intial cam break in so to ensure a good flow of oil on the cam lobes and good lifter rotation.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-25-2008, 12:03 PM
Registered User
 

Last journal entry: Albany Oregon Show
Last photo:
Join Date: Mar 2006
Location: Merlin, Oregon
Age: 59
Posts: 247
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Initial Timming

I know this is not timing, but if your engine gets a little warm/hot during break in I like to use a garden hose and run a gentle stream of cold water over the side tanks of your radiator. Thats of course if you have side tanks. Be careful not to get water on the core because it will pull through the radiator and spray everywhere. Make sure any water will drain out of your garage. Red hot headers is a good indication that your timing is not advanced enough or you are running to lean. I like to vary the rpm up about 500 every several minutes. Just give it a couple little reves once in a while.

Bob
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lunati cam and 305 sbc questions in a Frankenstein low budget rodder Engine 13 06-30-2009 04:55 AM
Cam Bearings and Core Plugs (SBC 350)89 gandl2123 Engine 15 03-26-2007 03:06 AM
350 chevy timing tiresmoke55 Engine 7 01-14-2006 10:55 PM
SBC Ignition Timing snod83 Engine 1 04-19-2004 04:42 PM
retarding cam timing fiscus Engine 9 01-09-2004 02:18 AM


All times are GMT -6. The time now is 11:41 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.