Author Topic: Vacuum advance?  (Read 1941 times)

Tower Rat 95B

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Vacuum advance?
« on: June 17, 2008 - 09:46:07 PM »
 Where does the vacuum advance tube connect to on a 440 Sixpack engine?  I have a vacuum fitting at rear of intake and one one the center carb, its been along time can't remember :clueless:........




Offline hemiken

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Re: Vacuum advance?
« Reply #1 on: June 17, 2008 - 09:52:00 PM »
Same as normal................ Run the tube from the dizzy to the metering block and the other three outlets one on each carb should hook up with each other :2thumbs:
1970 Barracuda   (O^--^===|===^--^O)
1971 Barracuda   (O O {]{]{]|[}[}[} O O)
1970 Challenger  (O O [======R/T=] O O)
1971 Challenger  (O O ===== ===== O O)
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Tower Rat 95B

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Re: Vacuum advance?
« Reply #2 on: June 17, 2008 - 09:56:16 PM »
 Thanks :thumbsup:,,, this weekend  :working: were going to tune it up good and then fry the tires :burnout: :burnout:  :bigsmile:........

Offline AMXguy

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Re: Vacuum advance?
« Reply #3 on: June 19, 2008 - 12:39:31 AM »
I fought my six pack  until I hooked the vac advance up to manifold vacuum as it should be, now it runs smooth as silk at all rpm.

An article that tells it all and has aswered all the questions I had on the subject, I don't know how to post a link but if you want a good read google " Timing and vacuum advance 101 by Lars Grimsrud "  all 3 of my cars run and perform better since I ditched the ported vac idea.
1970 R/T SE Challenger
 1970 Superbee
 1969 S code Mach 1
 1967  GTO

Offline Chryco Psycho

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Re: Vacuum advance?
« Reply #4 on: June 19, 2008 - 02:47:17 AM »
weird , this would give you full advance at idle & less at RPM , all engine I have seen set up ythis way over heat & eat fuel , this would have the vacuum working opposite & contradicting the mechanical advance leaving you with very little curve at all
I usually ditch the vacuum advance altogether & get great power & milage

Challenger - You`ll wish You Hadn`t

Offline Aussie Challenger

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Re: Vacuum advance?
« Reply #5 on: June 19, 2008 - 05:56:32 AM »
weird , this would give you full advance at idle & less at RPM ,
I usually ditch the vacuum advance altogether & get great power & milage

   :iagree:  On some earlier chebbies, 283 and 327 around 1964/65, I found that they had manifold vac to give a quicker take off, if it was disconnected they were hopeless ( yes they are anyway ). They were auto trans vehicles, doing this to a manual will make the car very jerky at low speed.
  As Chryo said best to leave disconnected, it is mainly for economy.   :cheers:
Dave

Offline AMXguy

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Re: Vacuum advance?
« Reply #6 on: June 20, 2008 - 12:23:34 AM »
I have to use it on my six pack,  if I put enough initial in it to idle decent then my mechanical is all in at 1800 which is way too early for my car.  I run my GTO, Mach 1 and Challenger this way and they all run great. after all under no load and light load conditions you can have lots of advance it only helps  , open up the throttle, drop your vacuum and it backs your timing off. makes perfect sense to me ,especially with the crappy gas we have these days.

 That article really is worth reading, I can't say he's right for every car but I'm sold.
 
1970 R/T SE Challenger
 1970 Superbee
 1969 S code Mach 1
 1967  GTO