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Author
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Topic: Vacuum Advance
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1969Fastback
Gearhead Posts: 116
From: Eugene, Oregon USA
Registered: Apr 2004
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posted 04-01-2004 07:19 PM
   
I am not new to this site. I have changed my username from Firechief1400 to 1969 Fastback it better suites the web site. I have discussed this issue before but with vacuum advance working. I have a Mallory Ignition system on my 69 351W FMX auto. I was getting a lot of predetonation when applying the throttle. I have plugged the vacuum line and it does not ping any longer. But I am not sure that I am getting the proper advance. I have played with the timing from 6 degrees to 12 degrees. Right now it is set at 10 degress. Also I have a 270H Com Cam installed. I know this is just a bandaid, not the fix. I need some pointers on what to do now. Put heavier springs in the distributor or what? What problems will I have running without vacuum?
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Fastymz
Moderator Posts: 18590
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-01-2004 07:45 PM
Whats your total advance and at what RPM. I was having that problem until I adjusted how much total timing I have and when it comes in.It hurt anything to run with it. Welcome back  ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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1969Fastback
Gearhead Posts: 116
From: Eugene, Oregon USA
Registered: Apr 2004
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posted 04-01-2004 08:13 PM
I am going to check my total timing advance this weekend and I will let you know. Thanks------------------
69 Sportroof 351W 4V FMX Chrome Yellow
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Fastymz
Moderator Posts: 18590
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-01-2004 08:22 PM
Check the total timing with the advanced capped off 1st , then hook it up and see how much more timing the advance adds.------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics [This message has been edited by Fastymz (edited 04-01-2004).]
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68GEETEE
Journeyman Posts: 28
From: TX, USA
Registered: Apr 2004
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posted 04-01-2004 11:02 PM
you can adjust exaclty when your vacuum advance comes on. This is different however, from curving your distributor. If you can grab the latest issue of Mustangs and Fords, they had an excellent article on how to do this. [This message has been edited by 68GEETEE (edited 04-01-2004).]
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