Maximum total timing - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans Advertise
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 05-05-2017, 03:30 PM
Registered User
 
Join Date: Feb 2014
Posts: 194
Wiki Edits: 0

Thanks: 22
Thanked 7 Times in 6 Posts
Maximum total timing

So I have been pondering this a while, what is the best way to determine maximum total timing? i've read you just keep turning it up until it pings then back it off a little.. I have a sbc 350 that has had timing marks verified with dead stop method and have had it as high as 40 (before the 10 degrees of vacuum advance) and ive never heard or felt a ping, I currently run it at 34 and its great but I feel it is currently no better or worse then it was when it was at 36-38. I want to spray 100-150 nitrous and Im not sure the best number to back the timing off of

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-05-2017, 08:38 PM
Rhansen's Avatar
Footbraker
 
Join Date: Jan 2004
Location: Davenport, Iowa
Age: 51
Posts: 693
Wiki Edits: 0

Thanks: 20
Thanked 19 Times in 19 Posts
I would go to the dragstrip (without the N2O) and add timing until the mph quits going up then back it down 1-2 deg from the best mph setting.
Never played with nitrous but am told you want to remove 2 degrees of advance for each 50hp shot.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-05-2017, 09:08 PM
rdobbs77's Avatar
Huge Guns N Roses Fan
 
Join Date: Nov 2015
Location: Nashville
Age: 43
Posts: 609
Wiki Edits: 0

Thanks: 220
Thanked 103 Times in 85 Posts
can't speak to nitrous (never ran it) but first and foremost as i was taught (minus nitrous philosophy), you run timing based upon what your engine likes at base or as a good friend once advised me, you run base time based upon a vacuum reading. from there you plot your timing curves (Ie dizzy springs and/or weights depending upon dizzy) and derive/reconcile upon your total timing. an sbc would be fine from 33-36 all in, so that could be why you've not noticed much difference by ear or even feel without hard core slip numbers for experimentation purposes. Know what power range your cam makes when it comes to timing too. In all honesty, who gives a crap if you're all in at 3000 if your cam does not even make power until say about 4000 rpm (yes that'd be a race set up but i was just making a point on time). 33 is a good number but it'd not hurt to bump it a few degrees and you'd gain hp on an NA motor (again, not speaking to nitrous but just throwing some of this out there).
Reply With Quote Quick reply to this message
 
  #4 (permalink)  
Old 05-05-2017, 09:19 PM
johnsongrass1's Avatar
Race it, Don't rice it!
 
Join Date: Jul 2002
Location: Columbia, Mo
Age: 43
Posts: 7,419
Wiki Edits: 0

Thanks: 130
Thanked 857 Times in 695 Posts
To answer the question. The very best way is on a dyno. The next best is timed runs. If that's not available then 36 on a wedge type chamber. Set it and forget it.

The seat of the pants isn't a very good way of determining nor does by hear. By the time you feel it or hear it the power is already way way down.
Reply With Quote Quick reply to this message
The Following User Says Thank You to johnsongrass1 For This Useful Post:
AutoMech (05-06-2017)
  #5 (permalink)  
Old 05-06-2017, 08:04 AM
Registered User
 
Join Date: Feb 2014
Posts: 194
Wiki Edits: 0

Thanks: 22
Thanked 7 Times in 6 Posts
Cool thanks guys, basically what I had thought. Gonna have to get to the track for some timed runs or arrange some dyno time, I think I know where it wants it but thought I'd ask.. I'm aware of the 2 degrees per 50 rule on the spray and I won't be spraying a big shot nor very often for that matter.. I've already experimented with initial and know where it likes that and my curve is all in by 2500.. if I wasn't hitting it with the gas this wouldn't be a problem.. truth be told I already put a hole in a cylinder wall this spring and got it sleeved and back together with better pistons, I just really don't want to do that again and still not that sure why it happened the first time..
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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



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
Chevy 355 Initial Timing and Total Advance Timing bwhit071 Engine 11 07-15-2015 11:51 PM
Ignition timing question - maximum effort turbo SBC Zeeb Engine 10 11-23-2011 06:46 AM
Total Timing ???? NATRAD Engine 4 02-12-2007 03:18 PM
maximum timing???? Ratchet Engine 2 04-09-2006 09:47 PM
Maximum timing advance for a 351C 2V??? Steve-0321 Engine 2 01-27-2004 03:51 AM


All times are GMT -6. The time now is 10:41 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.