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Author
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Topic: What timing!?
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Stang28965
Gearhead Posts: 450
From: Webster New York USA
Registered: Mar 2001
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posted 07-09-2001 05:47 PM
   
If I advance my timing my car does not like to go past 3,000RPM. It feels like its running out of gas, or does not have the air it wants. But if I put my timing really low, my car loves revving right out. What's the deal? please help
-Jeff
1965 Mustang Coupe
289 Bored .030over
302 Heads
420 lift Cam
H-Pipe with dynomax mufflers
8 inch rear with 3.55's
4speed trans
http://members.cardomain.com/stang65
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 07-09-2001 06:27 PM
When you advance your base timing, then your centrifugal advance and vacuum advance(if you use it) will follow in line with the additional advance. When you increase your base advance, you must back off the vacuum advance and full advance the same amount in order to get somewhere around 34-38 degrees total advance at around 2500-3000 rpm.. You must modify your stock distributor, or use one that will allow you to decrease the amount of centrifugal advance..
You can also try using stronger advance springs in your distributor in order to limit the amount of advance.. If you don't know what your doing then get a good distributor man to set it up for you.. I run my 289 at 18 degrees base timing and 20 degrees centrifugal advance all 38 degrees in at 3500 rpms..
I also recommend you make sure you have good solid fuel lines all the way to the carb. Rubber lines get dry rotted and crack.. Use a High Performance fuel pump.. The stock Ford fuel pump is ussually only good for about 200 HP.. [This message has been edited by bluestreek (edited 07-09-2001).]
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Stang28965
Gearhead Posts: 450
From: Webster New York USA
Registered: Mar 2001
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posted 07-09-2001 07:00 PM
Thank you for the info, Do you know which port on my carb i should hook the vacumm advance to? I have it on the left side one now, I also have a modified distributor with the adjustable vacumm advance. Thanks again.
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Stang28965
Gearhead Posts: 450
From: Webster New York USA
Registered: Mar 2001
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posted 07-09-2001 09:18 PM
Forget that last post I posted, I got the car running pretty good I adjusted my vacuum advance. I set the timing to 16, Right now on the distributor I have the advance screw adjusted almost all the way in. Does this seem right?? It can turn out about 7 1/2 turns. But seemed to run best all the way in. Thanks again.-Jeff
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 07-09-2001 09:47 PM
The vacuum advance tube should be hooked to a port that "does not" have vacuum on it at idle.. When you crack the throttle open, then you need your vacuum to come in for the advance..Otherwise, it stays in all the time.
Vacuum advance is kinda tricky to set... The only reason to use vacuum advance is to get full advance at cruising speeds to increase engine and fuel efficiency.. It also gives you better response at light throttle.. At WOT (wide open throttle) the vacuum advance falls off and then the engine relies on centrifugal advance.. Most hot rodders don't even use vacuum advance.. They just make sure to have 34-38 degrees in by 3000 rpms.. I would start there and then play with the vacuum advance and see what setting works the best for your setup..
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74merc
Gearhead Posts: 956
From: Demopolis AL
Registered: Jun 99
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posted 07-09-2001 11:48 PM
what should total advance be during cruising conditions?
with vacuum advance, centrifical, etc.
what should total advance be @ 2000rpms?
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