Model a like a spirited colt or a carburetor problem

verrece

verrece

Senior Member
The problem I have is, when the engine is at idle, it looks like a galloping horse, indepently of the best position of the air idle adjust screw. Above 800 rpm the engine runs properly.
After I disassemble the carburetor, I saw that when the throttle plate (butterfly) is closed (in their rest place), it blocks ups a half of the idle hole in the carburetor throat.
Anyone could tell me if when the Throttle plate is closed , the correct position should block the hole completely? or should leave completely open the idle hole? Or as I have now, it should block half the hole?
Could this “half hole blocks” be the cause of the engine gallop?.
The carburetor passageways were cleaned, I followed the Tom Endy´s article.
Any advice will be appreciated.
 
hi Verrece, let me first say you have posted your question in the early ford v8 section, not the model A section where you may get more ideas. my thoughts are, the standard setting for most idle air screws is 1 1/2 turns to get started, and some fine tuning from there. i do not know what position the throttle plate will cover the hole in this setting, but if you are far from 1 1/2 turns, you have other problems. worn out around the shaft and leaking air? for example, are you sure the timing is right, and where is your spark lever set at idle? lots of things to be checked, try to post in the A section for more answers, skip
 
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