I have the base timing at 6BTC with the vacuum advance line disconnected and plugged. When reconnected the timing advances 20 degrees at idle! I am told this is due to a vacuum advance connection with a constant vacuum source as opposed to ported, which will give me no vacuum at idle.
The edelbrock carb has 2 vacuum connections on the front. The one on the left is ported. Both lines are connected to the distributor.
The right side (constant vacuum, even at idle) is connected to the outside diaphrame connection. The left side (ported) on the carb is also connected to the diaphram unit, only more toward the distributor.
Do I need to switch those lines? Do stock 289 distributors have 2 vacuum lines connected to the carb? If so, how are they connected? Which side is ported? UGH!!
Here is my theory. The constant vacuum should be connected to the inner port on the distributor diaphram unit which keeps a suction on the diaphram toward the distributor, preventing vacuum advance. The other side of the diaphram has a ported connection which does not pull until hihs RPMs are achieved. Then the diaphram is sucked away from the distributor, pulling the breaker plate and advancing the timing.
What do you all think about this?
I need a push in the right direction...
The edelbrock carb has 2 vacuum connections on the front. The one on the left is ported. Both lines are connected to the distributor.
The right side (constant vacuum, even at idle) is connected to the outside diaphrame connection. The left side (ported) on the carb is also connected to the diaphram unit, only more toward the distributor.
Do I need to switch those lines? Do stock 289 distributors have 2 vacuum lines connected to the carb? If so, how are they connected? Which side is ported? UGH!!
Here is my theory. The constant vacuum should be connected to the inner port on the distributor diaphram unit which keeps a suction on the diaphram toward the distributor, preventing vacuum advance. The other side of the diaphram has a ported connection which does not pull until hihs RPMs are achieved. Then the diaphram is sucked away from the distributor, pulling the breaker plate and advancing the timing.
What do you all think about this?
I need a push in the right direction...