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total ignition timing #2643327 04/09/19 05:22 PM 04/09/19 05:22 PM
Joined: Mar 2008 Posts: 109 WASHINGTON S superbee471 OP member
superbee471 OP member S Joined: Mar 2008 Posts: 109 WASHINGTON	setting the ignition timing on a new 500 c.i. race b engine. engine has 12 to one compression, edelbrock rpm heads, hooker super comp. headers and holley 950 carb. set initial timing @12 to 13 degrees, with total all in at 2800 for a total of approx. 35 degrees. my question is will I gain any more by adding the 3 more degrees that I can get out of the MSD distributor, or is 35 total going to get me basicly what the engine is capable of ? the 440 I just took out ran its best with 35 total advance so used that to set new engine. any insights will be appreciated.

Re: total ignition timing [Re: superbee471] #2643332 04/09/19 05:37 PM 04/09/19 05:37 PM
Joined: Feb 2013 Posts: 154 Canada C cuda499 member
cuda499 member C Joined: Feb 2013 Posts: 154 Canada	I always ran a lot of initial...… like more then 20 degrees. It always liked starting that way. you can set this up in msd distributors with a different sized shim....

Re: total ignition timing [Re: superbee471] #2643340 04/09/19 05:50 PM 04/09/19 05:50 PM
Joined: Sep 2014 Posts: 4,457 Washington M madscientist master
madscientist master M Joined: Sep 2014 Posts: 4,457 Washington	You need to account for the amount of retard your ignition box has. You can't see it with a timing light, but it's there. Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

Re: total ignition timing [Re: superbee471] #2643350 04/09/19 06:06 PM 04/09/19 06:06 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Originally Posted by superbee471 setting the ignition timing on a new 500 c.i. race b engine. engine has 12 to one compression, edelbrock rpm heads, hooker super comp. headers and holley 950 carb. set initial timing @12 to 13 degrees, with total all in at 2800 for a total of approx. 35 degrees. my question is will I gain any more by adding the 3 more degrees that I can get out of the MSD distributor, or is 35 total going to get me basicly what the engine is capable of ? the 440 I just took out ran its best with 35 total advance so used that to set new engine. any insights will be appreciated. You should re-do the timing curve and install more base and less on the advance.. still have about the same total

Re: total ignition timing [Re: MR_P_BODY] #2643363 04/09/19 06:34 PM 04/09/19 06:34 PM
Joined: Aug 2006 Posts: 614 Michigan G Get-X mopar
Get-X mopar G Joined: Aug 2006 Posts: 614 Michigan	Yep, agree with the others here, I'm normally 20ish initial and 36ish total. It may vary slightly from engine to engine, but that will get you close. '65 Belvedere '68 GTX '57 Dodge pickup

Re: total ignition timing [Re: Get-X] #2643368 04/09/19 06:55 PM 04/09/19 06:55 PM
Joined: Jan 2003 Posts: 31,082 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,082 Oregon	For a race engine I always used the black bushing in a MSD distributor which was 16 degrees. So if you had 36 total you had 20 initial. That works pretty well for most big block Mopar engines. It doesn't work great on a street engine, but it works just fine for a drag race engine.

Re: total ignition timing [Re: AndyF] #2643463 04/09/19 11:00 PM 04/09/19 11:00 PM
Joined: Nov 2009 Posts: 3,082 St. Paul , Mn. tubtar master
tubtar master Joined: Nov 2009 Posts: 3,082 St. Paul , Mn.	In at 2800 ? I like to get in in by 2200. Street or race , but every car I have owned that I was this particular about the timing with was driven with a heavy right foot and size 15 carbon footprint. I am using an MSD 6AL2 programmable now , and use the box to handle start retard and advance. Just write the curve how you want it , and forget about it.

Re: total ignition timing [Re: superbee471] #2643472 04/09/19 11:23 PM 04/09/19 11:23 PM
Joined: Aug 2003 Posts: 43,315 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,315 Bend,OR USA	Not all BB Mopar race motors like the exact same total timing, not all timing lights show exactly the same timing also, especially with race ignitions I would start with 34 degrees total, and do and then try 35 after the new motor is repeating times within .001 to .003 for 5 or 6 runs or more, then 36 and maybe even 37 and 38 to find out exactly what the new motor wants. Did you verify TDC on the balancer and timing tab? If not do that first before doing anything else If so proceed to testing at the track Let us know what you find works the best now Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: total ignition timing [Re: tubtar] #2643485 04/10/19 12:29 AM 04/10/19 12:29 AM
Joined: Dec 2007 Posts: 12,592 Great Neck,LI,new york hemi-itis I Live Here
hemi-itis I Live Here Joined: Dec 2007 Posts: 12,592 Great Neck,LI,new york	Originally Posted by tubtar In at 2800 ? I like to get in in by 2200. Street or race , but every car I have owned that I was this particular about the timing with was driven with a heavy right foot and size 15 carbon footprint. I am using an MSD 6AL2 programmable now , and use the box to handle start retard and advance. Just write the curve how you want it , and forget about it. With a map sensor the boost retard can also be used! HEMI-ITIS has no cure. My condition is fully BLOWN!!

Re: total ignition timing [Re: hemi-itis] #2643507 04/10/19 04:29 AM 04/10/19 04:29 AM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	As Cab said, not all motors react to the same timing. I have an alloy B block with -1 heads, single 4 bbl at 12.5:1 compression.. we start at 22* @1000rpm idle, the advance only kicks in at 5000 rpm where we jump to 38*. The brake launch rpm is 5500 rpm, the converter is 6700 rpm, we rev to 8k. The car runs 8.9@151 mph.Plugs look clean, bearings are still mint at rebuild time, never any sign of detonation. I do have a reverse flow water pump that might be the deciding factor. Last edited by rebel; 04/10/19 04:30 AM.

Re: total ignition timing [Re: superbee471] #2643546 04/10/19 09:09 AM 04/10/19 09:09 AM
Joined: Nov 2015 Posts: 884 Missouri J jwb123 super stock
jwb123 super stock J Joined: Nov 2015 Posts: 884 Missouri	Their are better ways of calculating proper advance curves than asking others experience. I use Performance trends engine analyzer software, it will calculate a advance curve for what ever engine combination you have with what ever fuel you are going to put in it. It has been accurate with all the engines I have built. And takes into account all parameters if you put good numbers into the program. I have also use the program when setting up electronic fuel injection timing maps with good results as well. http://www.performancetrends.com/Engine-Analyzer.htm

Re: total ignition timing [Re: superbee471] #2643759 04/10/19 06:43 PM 04/10/19 06:43 PM
Joined: Jan 2007 Posts: 8,043 Mt Morris Michigan mopar dave master
mopar dave master Joined: Jan 2007 Posts: 8,043 Mt Morris Michigan	My pump gas 511 likes 28 initial and all in by 2500 at 35. The more initial I give it the more it likes it with a 270@50 solid. I have 10* retard start. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

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