Off-idle stumble issues are also affected by the relationship
between the primary throttle plate and the idle transfer slots, located
above the mixture screws, in the carburetor base plate. With the throttle
plates at idle, just the right amount of the slot needs to be uncovered
for things to work right, too much or too little and there will be a flat
spot when the throttle is opened. If one googles the words"off-idle
stumble, transfer slots" there is a fair amount of information on
the subject.
Mike
At 12:36 PM 5/13/2009, David Homstad wrote:
Ed,
If this ?stumble? is only for a second or 2 off idle, I would try first
moving the accelerator pump link rod to a richer squirt. Most carbs have
3 settings for this rod, and since it is external and no parts are
required to change the position, it is easy.
If your ?stumble? is more prolonged, than maybe Daytona Parts is right.
Today?s gas (10% alky) does make the engine run leaner. But alky is not
literally 'thicker'. It just has less (about half) burnable material
(Hydrogen & Carbon) than gasoline of the equivalent volume. Alky also
has some Oxygen in its molecular structure. This is why oil companies use
the misleading word ?Oxygenated? instead of ?gasohol?. Gasohol left a bad
memory in many people?s minds when the initial use of methanol ate the
fuel system rubber in many cars. Aside from forcing us to use renewable
fuels, it is the government?s way, in one stroke, of leaning out the
millions of carbureted cars currently on the road to reduce hydrocarbon
emissions.
Dave Homstad
56 Dodge D500
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