|
Trackrash: With longer studs you can install two or more insulators. I recall Grady Clay used a three insulator stack on his track car.
Your 120 idle air bleeds offset the large idle jets is my guess.
If percolation isn't causing fuel to drain onto throttle plates then there is a siphon issue that is implied. Idle air bleeds emulsify the fuel delivered to the idle/progression circuit. Upon engine shut-down the idle air bleeds allow atmospheric air to enter this fuel supply circuit and break the siphon action that would otherwise occur. Fuel siphoned in this method will hit the top of the closed throttle valve & drain out through the throttle shaft bushings.
Another fuel path into the cylinder is via percolation passing up the emulsion tube well.
I think you may want to investigate the cleanliness of your galleries feeding the idle jets. If dirty/corroded then they will inhibit fuel flow to the idle jets, regardless of its size. I have seen this in my work and now I routinely open & clean these out. I developed a method for using compressed air to isolate these galleries to forcefully blow through them but this has proven ineffective compared to mechanical cleaning. Also, some internal restriction may explain the siphoning although I am not sure. Regardless, the cleaning of the galleries is a good thing since these carbs are quite old.
|