total timing - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old Aug 11th, 09, 07:23 PM Thread Starter
Senior Tech
Randy
 
Join Date: Aug 2006
Location: illinois
Posts: 571
total timing

still trying to get this timing right, today we warmed motor up, unhooked and plugged vacuum advance, then i had my dad rev motor to 3000 rpm, timing was at 42, we turned distributor until we had 36 at 3000, then checked initial it was around 16 or so, with advance hooked back to manifold vacuum, timing was only 22, so i turned allen screw in vacuum can until i had 28-30 at idle. did i set this right? i switched from a 575 demon to a 650 holley, and it doesnt have explosion of power like it did before.
rkmjbad67 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old Aug 11th, 09, 07:41 PM
Senior Tech
Tom
 
Join Date: Jun 2001
Location: Rochester Mn
Posts: 7,749
Smile Re: total timing

Why did you adjust your vacuum advance ? Did you try it with 16 initial ... 36 total ?
Set your vacuum advance back to stock and try it !

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
TJS69 is offline  
post #3 of 9 (permalink) Old Aug 11th, 09, 11:52 PM
Senior Tech
Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,316
Re: total timing

Well at 42 cent it was over advanced, simply knocking back has dropped the curve so in between intial and all in it is to retarded
Drop in a set of springs that come off about 300 rpms above idle speed.

And run a site search on the subject so you understand exactly what you are doing.

My Spelling is not incorrect...it is creative

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Steptoe is offline  
 
post #4 of 9 (permalink) Old Aug 12th, 09, 02:01 AM
 
Join Date: Aug 2008
Posts: 11
Re: total timing

42 sounds a bit on the high side.try 34 total and about 18 -20 at idle,what size engine,cam,compression etc?because that will effect what your timing should be set at.

dave
auckland, new zealand
dave ilich is offline  
post #5 of 9 (permalink) Old Aug 12th, 09, 02:55 AM Thread Starter
Senior Tech
Randy
 
Join Date: Aug 2006
Location: illinois
Posts: 571
Re: total timing

engine is a 327, 9.1 Cr, vortec heads, comp cam 274-286 230-236 490-490
rkmjbad67 is offline  
post #6 of 9 (permalink) Old Aug 12th, 09, 04:45 AM
Gold Lifetime Member
BILL
 
SPARKY69's Avatar
 
Join Date: Oct 2007
Location: HENDERSONVILLE N.C.
Posts: 9,352
Re: total timing

16-18 intial and 32 total
SPARKY69 is offline  
post #7 of 9 (permalink) Old Aug 12th, 09, 09:44 AM
Senior Tech
Tom
 
Join Date: Jun 2001
Location: Rochester Mn
Posts: 7,749
Smile Re: total timing

From the Nasty Z28 site :

Point type distributors : you want to keep the stock weights and simply change the springs. By doing this, you keep the total advance (11 degrees), but the lighter spring allows the advance to come on quicker (just off idle). The curve should look something like, 2 deg @ 800 rpm, 6 deg @ 1100, 10 deg @ 1900 and full @ 2200 rpm. advance should begin just off idle and be fully advanced (13 degrees) at around 2000 rpm.

HEI distributors : you want to keep the stock weights and simply change the springs. By doing this, you keep the total advance (11 degrees), but the lighter spring allows the advance to come on quicker (just off idle). The curve should look something like, 2 deg @ 800 rpm, 6 deg @ 1100, 10 deg @ 1900 and full @ 2200 rpm.

Everyone has their own idea on what Total timing should be. 36 has worked very well for me over the years. If it was a Big Block I would say 32-34.

327's seem to like a lot of timing. (at least mine does). You are using way to much initial timing in your vacuum advance. I have never had a reason to adjust my vacuum advance. My adjustable "can" is on a shelf in the garage.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
TJS69 is offline  
post #8 of 9 (permalink) Old Aug 12th, 09, 03:33 PM Thread Starter
Senior Tech
Randy
 
Join Date: Aug 2006
Location: illinois
Posts: 571
Re: total timing

i know with 18 initial timing, i had almost 43 at idle with vacuum hooked to manifold vacuum, so i adjusted advance can until i had about 30 at idle. i think if i had 18-20 initial and 36 total with about 14 vacuum advance, it would work great
rkmjbad67 is offline  
post #9 of 9 (permalink) Old Aug 12th, 09, 05:55 PM
Senior Tech
Tom
 
Join Date: Jun 2001
Location: Rochester Mn
Posts: 7,749
Smile Re: total timing

Your Total timing = base timing + centrifugal advance.

Vacuum advance is not calculated in this. After you set your initial, or total timing, you can then hook up your vacuum advance. You can then change your amount of vacuum advance, once this is done.

Your timing curve is when and how fast your mechanical (centrifugal) comes in... as shown above.

Like I say "I have never used an adjustable vacuum advance, as I have never felt the need to."

I have run 38 to 40 total timing, but "pinging" was too bad, and will back it off to 36.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
TJS69 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user 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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome