Holley/Demon Carb stumble
This from the Urich and Fisher book.
Link in this post: Carb knowledge help needed
On the primary side it will be easier to determine if initial t-slot - throttle relationship is correct.
The conditions where too much or too little t-slot is exposed are circled.
I crossed off the idling characteristic because I have doubts that will always be true - especially with a four corner. You can add or reduce idle fueling with the mixture screws, or be rich enough for a 'smooth' idle (for a hot cam) but still have the slots out of position for good non-stop delivery as the throttles open.
Write everything down and think about what's probably going on. For example, if the mix screws are non-responsive, then there could be too much fuel being contributed from the slots.
With 4 corner idle, you've roughly doubled the potential fuel delivery at idle. So don't be surprised if you don't have to open the idle mix screws very much on motor with semi-decent vacuum. The important point is the engine responds to turning them in or out.
This from the Urich and Fisher book.
Link in this post: Carb knowledge help needed
On the primary side it will be easier to determine if initial t-slot - throttle relationship is correct.
The conditions where too much or too little t-slot is exposed are circled.
I crossed off the idling characteristic because I have doubts that will always be true - especially with a four corner. You can add or reduce idle fueling with the mixture screws, or be rich enough for a 'smooth' idle (for a hot cam) but still have the slots out of position for good non-stop delivery as the throttles open.
Write everything down and think about what's probably going on. For example, if the mix screws are non-responsive, then there could be too much fuel being contributed from the slots.
With 4 corner idle, you've roughly doubled the potential fuel delivery at idle. So don't be surprised if you don't have to open the idle mix screws very much on motor with semi-decent vacuum. The important point is the engine responds to turning them in or out.