Stock ignition timing ? - 460 Ford Forum
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post #1 of 4 (permalink) Old 06-13-2012, 10:25 AM Thread Starter
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Stock ignition timing ?

As the title says,what is the ignition timing for a stock '73 460 running duraspark,750 vac sec and headers ?
Cheers
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post #2 of 4 (permalink) Old 06-13-2012, 08:41 PM
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Originally Posted by Daz_uk View Post
As the title says,what is the ignition timing for a stock '73 460 running duraspark,750 vac sec and headers ?
Cheers
The oem specs for ignition timing assume the oem distributor.

There are about 25 horses in properly curving a reman or your oem dizzy. Not to mention the mileage increases and enhanced driveability...



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post #3 of 4 (permalink) Old 06-13-2012, 11:49 PM
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I was having trouble tracking down an answer for this questions a while ago for my '77 F250. It's not in ANY of the shop manuals, as they all say "check the sticker under the hood" - well my truck didn't have that sticker anymore!

I set the initial timing at 10* BTDC (Vacuum unplugged). I probably could've gone higher, but the truck was running 87 octane Now that I'm on 93 pump gas, I could probably bump it up a little. (maybe 12*).

At full mechanical advance, I think I saw around 35* Total advance (which would mean the previous owner put a 13T centrifugal unit in for 26* of advance). My distributor comes in with full mechanical advance at around 1,500rpm, which is probably a little too soon. The previous owner probably modified it. He did a lot of things the "cheap way" if you get my drift

With full manifold vacuum on the distributor, I also saw around 30-35* of advance, I may need to mess with the vacuum canister (and also mark my crank pulley for more accurate timing, it only goes from 0* to 30* advance, and you can't read any of the marks except for 10, 20, and 30!)

Does this help? I've seen answers varying from 6-12* BTDC for static initial timing. These answers are probably based on lots of factors, as what kind of fuel you run, what altitude you're at, and overall mixture control.

-Brad
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post #4 of 4 (permalink) Old 06-14-2012, 09:11 AM Thread Starter
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I did have it at 14* but the reason I was looking at it was I've just rebuilt the carb and it was running rich even with the idle mixture screws fully in.....and as I understand it over advanced ignition timing can have that effect.
I've now set it at 10*,it's idles fine and revs cleanly and Co is down to around 3.5% but the idle screws are still screwed right in.Shouldn't the motor die ?
I have the transition slots set correctly,ie,the secondaries are fully closed and the primaries the slot has a square visible.

To be honest the engine needs to see some miles,it's been standing for years and just gets started and run up to temperature occasionally.It was running mega rich and the plugs were fouled.
What the valves are like is anyones guess lol
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