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#1 |
Registered User
![]() Join Date: Aug 2008
Location: Kaufman,Texas
Posts: 102
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I installed the new HEI with vacume advance and I am wondering which vacume port to use. My old HEI did not have a vacume canister so with the new one do I get vacume from the manifold or higher on the carb? If any one has pictures that would be great. There are several places on the carb as well as the intake I could use for vacume. Thanks, Shawn
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#2 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
Manifold vacuum off the carb.
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Beat it to fit, Paint it to match... ![]() |
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#3 |
Registered User
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 591
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
It depends, you can run it on both ported or manifold. Ported vacuum creates no signal at idle and increases as you open the throttle blades and manifold vacuum gives the highest signal at idle and tapers off.
Your combination/transmission is going to determine where you run it at. You can try both and see how it responds. |
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#4 | |
Registered User
![]() Join Date: Aug 2008
Location: Kaufman,Texas
Posts: 102
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
Quote:
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#5 |
Registered User
![]() Join Date: Aug 2008
Location: Kaufman,Texas
Posts: 102
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
The ignition I replaced was a bone stock(besides missing the vac. advance canister) wore out HEI. I replaced it with a brand new high performance GM model that is rated at 50,000 volts. I was really expecting some major increases in performance but so far really let down. I even replaced the wires with a high dollar set of Taylor wires.
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#6 |
Registered User
Join Date: Mar 2008
Location: Powhatan, Va.
Posts: 376
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
Did you install the HEI in the truck in your avatar? If you did you need to make sure you have a full 12 volts supplying the coil. The old points ign wire is a resistor wire, it steps the voltage down to about 9 volts to keep from burning the points. It will run the HEI but you won't get the full benifit of the HEI ignition. Usually you run the vac line to ported vacume, so above the throttle blades, this way you get ignition advance for part throttle driveablity and economy. It doesn't hurt anything to run it on straight manifold vacume like stated above it depends on what your truck likes most.
Sean |
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#7 |
Registered User
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 591
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
You generally won't see any increase in performance, you just won't see a loss of performance either. High rpm is where a good aftermarket is ignition is going to shine.
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#8 |
Registered User
![]() Join Date: Aug 2008
Location: Kaufman,Texas
Posts: 102
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
Thanks for the info. I will check the voltage to the HEI and play with it some tomarrow. Shawn
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#9 |
70 Chevrolet=Obsession
Join Date: Jun 2009
Location: nice ca
Posts: 1,067
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Re: Well the new ignition is in, where is the proper place to hook up the vacume adva
I ran a 12 ga. wire from my battery to a 30A Bosch relay then to the HEI. I ran my ignition switch wire to the primary of the relay. Then I installed a ground wire from the HEI to the intake manifold. This setup insures full voltage to the HEI and it puts less stress on the ignition switch and works great!
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![]() ![]() ![]() I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner) Last edited by unclewatts; 01-07-2010 at 05:30 AM. |
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