Re: A12 Timing Specs
[Re: bdgtfb]
#2823089
09/20/20 09:55 PM
09/20/20 09:55 PM
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Joined: Jan 2003
Posts: 4,737 Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,737
Moved to N.E. Tennessee
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I don't recall the stock timing spec off the top of my head but it doesn't matter because your sixpack will hate it. Try the stock timing if you must but it will probably like 16 to 20 initial and about 36 total a lot better.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: A12 Timing Specs
[Re: A12]
#2823169
09/21/20 08:32 AM
09/21/20 08:32 AM
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Joined: Aug 2009
Posts: 1,318 Ohio
jlatessa
pro stock
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pro stock
Joined: Aug 2009
Posts: 1,318
Ohio
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From my memory,???I'm thinking 12* BTDC. w/727 Mind you this is 51 years ago.
When I put headers and cam and a few other mods, I ran 20* initial, no vacuum advance (old thinking) and 40* total.
The starter had to grunt a bit in hot weather.
Joe
PS As an aside, pure stock, with bumped timing, it ran 13.60s 106 MPH With the mods, on OE Polyglas, 12.8s at 112 MPH
A lot of fun in those days!!
Last edited by jlatessa; 09/21/20 08:40 AM.
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Re: A12 Timing Specs
[Re: GomangoCuda]
#2823174
09/21/20 08:56 AM
09/21/20 08:56 AM
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Joined: Jan 2003
Posts: 6,421 Abilene, Texas
fastmark
master
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master
Joined: Jan 2003
Posts: 6,421
Abilene, Texas
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I don't recall the stock timing spec off the top of my head but it doesn't matter because your sixpack will hate it. Try the stock timing if you must but it will probably like 16 to 20 initial and about 36 total a lot better. I agree. This is not 1969 where you can buy good gas. The gas makes the difference.
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Re: A12 Timing Specs
[Re: fastmark]
#2823181
09/21/20 09:29 AM
09/21/20 09:29 AM
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Joined: Jan 2003
Posts: 12,216 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,216
Benton, IL.
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While I agree with the recommendations here, I am not sure that the OP should start throwing 36* to 40* at his 440 with the limited experience that he appears to have.
With that caution, the only other thing I would add is that he get some help and re-curve it to have it all in by 2,000RPM or so.
Master, again and still
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Re: A12 Timing Specs
[Re: A12]
#2823224
09/21/20 11:50 AM
09/21/20 11:50 AM
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Joined: Jan 2003
Posts: 4,737 Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,737
Moved to N.E. Tennessee
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Not saying this is A12 440 3x2 specs, but I've had this for a long, long time and may get you close or at least a good starting point.
MikeR
Yikes, TDC at idle. That distributor will definitely need recurved. The curve described in that FSM is asking for the idle speed, vacuum and timing to circle the drain (aka death spiral). As the vacuum drops the idle speed drops, as the idle speed drops the timing drops. As the timing drops the idle speed and vacuum drop even more and so on until the engine stops running.
In theory, there is no difference between theory and practice. In practice, there is.
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