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Vacuum advance benefits? |
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Nov/25/2011 at 12:38pm |
Not that it's gospel, but here's one literary reference that states http://www.hotrod.com/techarticles/setting_timing_curves_tech/ |
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firefly
AMC Nut Joined: Dec/23/2008 Location: wi. Status: Offline Points: 355 |
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I use 91 octane,no ethanol. The guy that dyno's my engines said that I didn't need it and he's been right. On the dyno he's run it on 100 octane too. I only have manual trans. if that would make any difference.
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carnuck
AMC Addicted Joined: Mar/31/2010 Location: Seattle Status: Offline Points: 3942 |
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then you probably have crappy gas in your area.
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http://forums.amceaglesden.com |
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firefly
AMC Nut Joined: Dec/23/2008 Location: wi. Status: Offline Points: 355 |
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I don't run ANY vacuum advance on any of my AMC's and they run great. |
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DocCreer
AMC Addicted Joined: Oct/03/2009 Location: Portland Oregon Status: Offline Points: 1568 |
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Well in my experience with vacc advance is that lighter springs arent always better..when i upgrded my 232 to HEi i got a mr.gasket recurve kit and installed the new weights and lightest springs...it pulled away from lights very fast and smooth then....PING PING PING....so i took it apart and put the stiffest in the pack...still pinging...so finally i went to the junkyard and got fresh looking weights and springs from a wrecked gmc van...installed the GM weights and one gm stiff spring and one medium spring from the mr.gasket pack.So far Mileage has been creeping up..no more pinging,and more cruising power.Just dont use the Mr.Gasket weights.
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61 American
82 eagle limited |
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Beg to differ, but respect the opinions of others. Holley carbs, both 2-Corner and 4-Corner, have Secondary Idle Circuits and delivery. It is possible to achieve full combined Intial + Mechanical + Vacuum Advance. Vac Adv changes Distibutor Phasing when actuated, Initial and Mechanical do not. Adjustable Vac Adv Cans fail to allow adjustment of the Full Advance vacuum level |
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billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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Already ate - had the most people ever in the house - Barbara's parents for the first time, and for the first time her parents met my parents and 2 fridges are still FULL after sending left-overs home with everyone. (and the cats stayed clear for the most part, except Yawnie who soaked up all the attention he could get by pretending to be cute and cuddly.) |
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69 ambassador 390
Supporter of TheAMCForum Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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It just goes to prove that wherever you go, There you are. This turkey is basted. Deads birds tell no tails. Happy turkey day. I'm eatin!!!!!
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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carnuck
AMC Addicted Joined: Mar/31/2010 Location: Seattle Status: Offline Points: 3942 |
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The late '70s Prestolite distributors ran manifold vacuum because they operated backwards (advanced with spring power when the vacuum dropped off)
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17tamx
AMC Addicted Joined: Dec/23/2008 Location: Peoria, AZ Status: Offline Points: 1170 |
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The tech
article from the GM Engineer has been hashed out here so many times it is
boring. So much of it has been proven
wrong over the years and some of the theories are based on wrong assumptions. The
argument about ported vacuum and manifold vacuum is decades old and most OEM’s
went with ported and Chevy went with manifold. The antique cars that used
vacuum advance first went with ported vacuum. I for one
will stay with ported vacuum on all of my old cars for both street and strip. Why,
because it works. It doesn’t bother me if someone has their car set up with
manifold vacuum. I like the fact that my
car runs the way it does when I get on it and how good the throttle response is
when I get on it hard. Not everybody has the talent to set-up their ignition
and fuel system correctly to get the peck performance that their engines are capable
of. I would
say try it both ways and see which works best for you. I am tired of the arguments. Happy
Thanksgiving everyone, it’s time to go eat some Turkey and drink some spirits. |
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Kirk P. Fletcher
70 AMX BBG w/Shadow 390 4sp 71 SC360 Wild Plum Ram Air 4sp 67 Rogue Convert 343 4sp 66 Rogue Hardtop 290 Auto 66 440 Convert 232 Auto |
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