Monte,
My initial impression would be a massive vacuum leak of some kind. Or fuel
shortage to one carb. Having to cover the air intake to keep the car
running would increase the vacuum and the pulling of petrol so it sure
sounds like some form of fuel starvation to me.
No doubt some details are missing. Yes, the carbs both should have
significant suction.
Things to look for - first, I'd take the covers off both float bowls and
verify the fuel levels on both. With the tops and floats out, they should
be maybe 2/3 or 3/4 full roughly. Take both carb tops off and remove
pistons - make sure both jets at the base are seated similarly. Also, fuel
should be maybe visible slightly below the jet (otherwise its plugged), As
mentioned before, pistons should move freely up and down, particularly when
the dampers are not in (with dampers and oil, they are a bit more sluggish
in response).
many people have told me how tough it is to synchronize the dual carbs. Not
so. Before I had fancy gizmos like the Unisys and the Gunsen tools, I just
made sure they were both set the same. Nuts turned down 12 flats to start,
set the idle screws identically until you have the car idling well. When
you press the throttle, both pistons should rise in unison. Then go from
there. Forget the unisys until you have the carbs running reasonable well -
it is mainly used to measure the vacuum so you can synchronize the idle
between both carbs.
At least thats how I see it.
David Councill
67 BGT
72 B
At 07:27 PM 4/14/2003 -0500, MonteMorris wrote:
>The UniSync covers only one carb at a time.
>Being totally unfamiliar with carburation, I'm not sure how much suction the
>carbs should be creating, but it seems to be substantial. The car is idling
>very slowly at the starting adjustment for the throttle of one full turn in
>after it touches, and I must manually handle the throttle to keep the car
>running. When I switch the Unisync from the front to rear carb the car
>wants to dies unless I quickly cover the air intake(?) part of the carb and
>then the idle speed comes back up.
>Monte
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