 73 2.0 dizzy question |
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| rick 918-S |
 Jan 8 2015, 05:15 PM
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#1
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Hey nice rack! -Celette  Group: Members Posts: 20,834 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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I have a duel vacuum port advance unit on our 2.0. Can I ditch it and use a single port unit?
I think the second port is a decal thing for emissions right? Stock injection, tracked a vacuum leak and poor fuel mileage to the vacuum advance unit. |
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| Dave_Darling |
Jan 8 2015, 05:55 PM
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914 Idiot Group: Members Posts: 15,066 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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All of the vacuum canisters for the distributor had two fittings. For many of the 74+ cars, the advance fitting was simply not used.
You can use whichever ports you like, but the engine would probably run best with both the advance and retard hooked up, as it was in the 73s originally. --DD |
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| type47 |
Jan 8 2015, 06:13 PM
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#3
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
How many ports on the throttle body? It might have only one port so only one connection, retard I think, can be used, at least that's my case. The Cap'n pointed out the ports have different sizes and you match the throttle port(s) to the vacuum ports based on the size of the hose to connect the ports; hose connects same size ports...
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| r_towle |
Jan 8 2015, 06:53 PM
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#4
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Custom Member Group: Members Posts: 24,679 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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QUOTE(rick 918-S @ Jan 8 2015, 06:15 PM)  I have a duel vacuum port advance unit on our 2.0. Can I ditch it and use a single port unit? I think the second port is a decal thing for emissions right? Stock injection, tracked a vacuum leak and poor fuel mileage to the vacuum advance unit. You could just unplug the vacuum line and put a bolt in the end to cap it off. Vacuum advance makes your acceleration smoother by adding advance earlier, but you will feel the difference only in slow traffic. When you stomp on it, like I know you do, the mechanical advance takes over anyways, so it's no different. So long as everything moves freely, and your advance plates are clean and greased, you will get used to the difference pretty quickly and it won't bother you. The retard side is used to SNAP the advance plates back to idle very quickly to reduce over run and extra fuel being released into the atmosphere......but it's not anything you will miss. Rich |
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