I need education on the Thermoquad "staged accelerator pump" , that gives an additional shot when the secondaries open
Lemondana,
The TQ was in the best shape I have seen for a use carb in a very long time. I got it from a junk yard in the early 1980's and saved it all these years. The accelerator pump plunger bore was pristine. I tried 3 different rubbler accelerator pumps before finding this leather one. Unfortunately, I got the leather pump so many years ago that I don't remember when and where it came from. But now, with a good pump shot, the engine fires up cold instantly and idles at 1200 smoothly until the choke kicks off. This is what it should do and why I wanted to use the TQ. Surprisingly, even without a good accelerator pump, the car ran just fine with no stumble. The venturi flow must be sufficient to no need much of a pump shot.
I did have to change the throttle plate to one that had a vacuum advance port as this carb (9077S) was from a 77 440 HP with lean burn and didn't have a vacuum advance port. I don't think it is possible to drill the base for a port as there is a machined slot just above the primary throttle blade that controls the vacuum advance signal. But it worked fine with the base from an older TQ (but not as pretty as this one).
Lemondana,
The TQ was in the best shape I have seen for a use carb in a very long time. I got it from a junk yard in the early 1980's and saved it all these years. The accelerator pump plunger bore was pristine. I tried 3 different rubbler accelerator pumps before finding this leather one. Unfortunately, I got the leather pump so many years ago that I don't remember when and where it came from. But now, with a good pump shot, the engine fires up cold instantly and idles at 1200 smoothly until the choke kicks off. This is what it should do and why I wanted to use the TQ. Surprisingly, even without a good accelerator pump, the car ran just fine with no stumble. The venturi flow must be sufficient to no need much of a pump shot.
I did have to change the throttle plate to one that had a vacuum advance port as this carb (9077S) was from a 77 440 HP with lean burn and didn't have a vacuum advance port. I don't think it is possible to drill the base for a port as there is a machined slot just above the primary throttle blade that controls the vacuum advance signal. But it worked fine with the base from an older TQ (but not as pretty as this one).