Dizzy question - Vintage Mustang Forums
 
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post #1 of 5 (permalink) Old 01-01-2013, 09:04 PM Thread Starter
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Question Dizzy question

Since it appears that I have electronic ignition, should the vacuum port be capped off or does it make any difference ?
Thanks, Joe
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post #2 of 5 (permalink) Old 01-01-2013, 11:20 PM
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Huh? Having a Pertronix unit does not have anything to do with vacuum advance. Vacuum advance improves throttle response and fuel economy.

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post #3 of 5 (permalink) Old 01-02-2013, 12:32 AM Thread Starter
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Quote:
Originally Posted by 22GT View Post
Huh? Having a Pertronix unit does not have anything to do with vacuum advance. Vacuum advance improves throttle response and fuel economy.
The reason I asked is because you can see a vacuum port (?) to the left in the pic. that's not connected to anything.

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post #4 of 5 (permalink) Old 01-02-2013, 01:10 AM
Joe
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If you are talking about the vertical port in the picture, it is actually used to retard advance for emissions. I recommend putting a cap on it to keep out debris, unless you intend to use it and sacrifice some performance for the environment. The horizontal port not visible in the picture should be hooked up to ported vacuum from the carburetor.

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Last edited by Joe; 01-02-2013 at 01:16 AM.
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post #5 of 5 (permalink) Old 01-02-2013, 12:23 PM
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The only factory dizzy you would not need vacuum advance on is one from a Fox or SN (or other late model ECM controlled engines) where you are using the ECM to electronically advance timing.

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