Carb throat popping at speed, New Problem!!! Options

[LetoAtreides]

Ok, so I know I've posted this before, but I still cant figure it out, and I need to know all of the possible circumstances under which this condition occurs.

One of the throads on my dual carbs is excessively lout at speed. It sounds like pop-pop-pop.

Any ideas?

[ArtechnikA]

27, 28 - that's probably as close as most of us can get - within a degree.

ALL the specs are for TOTAL ADVANCE.

You set you INITIAL ADVANCE (what static timing sets...) to the TOTAL number.

The INITIAL (static) gets you close enough that the engine will start and warm up safely -- prerequisites for setting TOTAL advance with the engine running.

7° BTDC ought to be 6-8mm before TDC. It's just a guideline.

In the many threads on timing a T-IV it's noted that you should IDENTIFY and CLARIFY (white paint or something) the total advance mark on the fan. Sounds like good advice. (6's are timed at the flywheel...)

27-28 degrees TOTAL advance - this will be at some elevated rpm, like (I AM GUESSING - I DONNO T-IV's) 4500.

Don't worry too much if you don't understand the concept of distributor advance yet - lots of people don't. But if you're going to be tinkering with it, you need to know (and follow) the right procedure.