Timing a 327 - 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 07-15-2007, 03:16 PM
Registered User
 

Last journal entry: 1/2 ton
Join Date: Jul 2007
Location: Port George, NS, Ca
Age: 37
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Timing a 327

It just won't work right. At 4 deg. btdc, it diesel's when it's turned off. (chug chug...........chug...rattle) Plug in the vacuum advance and it goes well past 12 deg. There was alot of spark knock until I changed to premium fuel and octane boost. It's sluggish at low revs and it falls on it's face when I tramp it. Is it the HEI, the vacuum adv., centrifical, the 750 Q Jet, or compression.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-15-2007, 03:28 PM
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Feb 2007
Location: West Virginia
Age: 25
Posts: 3,393
Wiki Edits: 8

Thanks: 16
Thanked 1 Time in 1 Post
take it to 6 to 10 btdc and try that
Shane
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-15-2007, 04:02 PM
Member
 
Last photo:
Join Date: Feb 2005
Location: chillicothe oh
Age: 48
Posts: 1,445
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
advance it to 10 degrees to start with with the vacuum advance unplugged and the idle as slow as it will go without dying(to prevent centrifigal advance from skewing the readings)should be under 1000 rpm. Then reconnect the vac advance and reset your idle speed. Run on is usually caused by to large a throttle opening at idle not ignition timing (there is no spark with the key off so timing has no effect).However what happens is when timing is advanced idle speed rises helping add to the problem you must reset your idle speed when you are done.Then tune from there most sbc with stock heads like 36 to 38 total without vac advance all in by 3000 as a general rule(results may vary)
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-18-2007, 01:02 PM
Registered User
 

Last journal entry: 1/2 ton
Join Date: Jul 2007
Location: Port George, NS, Ca
Age: 37
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I changed it to 8 deg. and it took the flat spot out. It'll light it's tires now. F-Bird'88 asked about the heads. When I bought the motor, there was a set of 882's sitting on top, but people thought they were too big. So I ended up getting a H.O. 305 out of an 88 Camero. The center bolt heads had 194-160 valves and I believe 64cc chambers. It also had an older GM performance alum. intake. So there's the top end that went on.
I did notice something when I changed the timing. The carb is wet on both sides, so I think that might have something to do with the dieselling. The low speed jets are 1 1/2 turns out and the idle adjust. isn't even making contact.
One more thing. If you don't have a fan shroud, watch your knuckles!

Last edited by Andy327; 07-19-2007 at 11:53 AM. Reason: ad. info
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-18-2007, 06:59 PM
Registered User
 
Join Date: Jul 2007
Location: Victoria BC
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
[QUOTE=Andy327]So I ended up getting a H.O. 305 out of an 88 Camero. The center bolt heads had 194-160 valves and I believe 64cc chambers. QUOTE]

I ran 305 heads (early 70's) on a 350 below and had similar issues -- my issue was the CR, bumped the gas to 91octane (as suggested above) and all was well. Had about 12deg of timing into it.

I found 89octane was too low, and 94octane wasn't required. This is all assuming you don't have any methanol content in your gas.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-18-2007, 11:19 PM
Member
 
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 65
Posts: 5,106
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by barnym17
Run on is usually caused by to large a throttle opening at idle not ignition timing (there is no spark with the key off so timing has no effect).However what happens is when timing is advanced idle speed rises helping add to the problem you must reset your idle speed when you are done.

What he said. Try backing off the idle speed a little bit.
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:
Insurance
Please select your insurance company (Optional)

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
327 initial timing? 1 Day Engine 5 07-01-2007 07:58 PM
chevy 68 327 initial timing Ken & Joyce Engine 1 03-28-2007 03:26 PM
ignition timing bad502 Engine 21 02-20-2006 06:57 PM
Timing problem - Help MTMike Engine 1 11-13-2002 01:07 PM
327 timing? briwill Engine 5 11-11-2002 09:04 PM


All times are GMT -6. The time now is 11:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.