Re: Total Timing- Big Block
[Re: Hotlumpy]
#1431004
05/06/13 12:06 AM
05/06/13 12:06 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I would definitely start with the tried & tru 36-38 for a sensible start. I would (1) set the initial with the "vacuum gauge method" then with that figure in hand (2) shorten the slots to get 36-38 (3) then springs (4) then hookup/adj vac adv (2 adjustments on it)
live every 24 hour block of time like it's your last day on earth
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Re: Total Timing- Big Block
[Re: Exit1965]
#1431006
05/06/13 12:13 AM
05/06/13 12:13 AM
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Joined: Jan 2004
Posts: 27,347 Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Does the engine have quench? Without Quench 36 is typical, with it 30-32 commonly works better because of the faster burn...
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: Total Timing- Big Block
[Re: Hotlumpy]
#1431007
05/06/13 05:01 PM
05/06/13 05:01 PM
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Joined: Feb 2003
Posts: 10,232 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,232
Someplace you aren't
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You should try a few different settings and see what it likes. I found 36-38 made the engine run choppy, even though I couldn't hear any detonation. 34 was a smooth running setting. Hard to say what CA gas will do for your's. Combustion chambers can make a difference.
I want my fair share
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Re: Total Timing- Big Block
[Re: gdonovan]
#1431009
05/06/13 06:14 PM
05/06/13 06:14 PM
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Joined: Jan 2003
Posts: 75,092 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,092
A Banana Republic near you.
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Very little ( ok NONE ) info given on the engine and setup. That said my 69 383HP with 56k miles and factory 9.3 compression picked up when I bumped the timing from 36 to 39 , It was recommended that I could got as high as 42 , but I was too to try that.
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Re: Total Timing- Big Block
[Re: Hotlumpy]
#1431011
05/06/13 07:05 PM
05/06/13 07:05 PM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,292
Bend,OR USA
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It depends on many things what each motor wants, compression, combustion chamber design, fuel quality and octane, spark plug heat range, elevation the car is driven in and how much your butt dyno can detect on tuning changes I have built,dyno tested and tuned, driven and raced a bunch of different BB motors, mild to wild, 325 HP to 845 HP I would start at 34 total and go drive it, retard to 32 and drive it, then 36, maybe 38 and see what you and the car like Higher elevations (less thick air and B.P.) usually will tolerate a little more total timing than the same motor at or near sea level BTW, I like a lean mixture and a cold spark plug with the total timing that gives the best results
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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