123 Ignition Vacuum Adv, Learn me on some vacuum |
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123 Ignition Vacuum Adv, Learn me on some vacuum |
nditiz1 |
Jul 11 2018, 06:59 AM
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#1
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Senior Member Group: Members Posts: 1,177 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
Ok so I'm currently running the 123ignition dist on my 2056 with dual webers. I read the instructions and don't understand the mapping. I also don't know how it all works together. Can someone educate me on the vacuum adv and what curve would be best? As the rpm's increase it creates more vacuum thus creating more adv, but if I already have a curve setup to go from 12 degrees at idle to 28 degrees at 3000+ will the vacuum adv move the timing even higher once it is hooked up and mapped?
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Mark Henry |
Jul 11 2018, 08:34 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
On dual weber's you shouldn't run vacuum advance, dual carbs (or ITB's) have a piss poor vacuum signal and will likely only cause you headaches.
The more duration the cam has the worse it gets. If you really want vacuum advance I would run the vacuum hoses to a central sealed box then to the dizzy. I'd also stick a .023 mig welder tip into the vacuum hose(s) to help even out the pulses. Likely you'll have to tap the manifolds in a couple of different places and play around to find the best vacuum signal. I won't be surprised if you end up capping/disabling the vacuum advance. |
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