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 Robo
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| posted on May 8th, 2003 at 01:27 PM |
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Dual vac advance dizzy
Hi guys
I have a 77, 2ltr, it originally had an air injection pump, but I have removed the pump and all the plumbing, and am now running a single carb with
the original vac dizzy with the two vacum ports, there is only one vacum take off on the manifold, witch I have used to connect to the dizzy.
What should I do with the other dizzy port, plug it or just leave it open?
thanks Rob
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jeffh
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| posted on May 8th, 2003 at 06:21 PM |
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The vacuum advance connection to your distributor must come from a port just above the throttle plate. It goes to the connector on the domed side on
the vacuum can. the other connector on the flat side should be left open.
If your carby does not have this port then do not use a connection on the manifold. It will give vac advance at idle rather than partial thtrottle
which is where you need it.
Jeff
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Robo
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| posted on May 9th, 2003 at 08:55 AM |
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Thanks Jeffh
I just dont like things being left open, but if thats the way it should be then I will leave it be!
Rob....
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jeffh
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| posted on May 9th, 2003 at 05:23 PM |
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Think of the second connector on the flat side as being a vent.
But do make sure the connector on the dome side is connected to ported vacuum not manifold vacuum and is timed as for a single vacuum distributor 7.5
deg BTDC
Jeff
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bugmeister
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| posted on May 9th, 2003 at 06:22 PM |
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Isn't the retard side meant to be feed from the head side of the butterfly? If so it wouldn't be too hard to fab something up like a
hosetail tapped into the manifold. Also I recently read Shad Laws (A knowledgeable guy IMHO, just look at those Nickies) Ignition Timing 101-103
series and he stated that unlike EGR valves, dashpots etc., the retard was one anti pollution device he left connected as it didn't adversely
affect performance or economy.
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