Hello Gary -
Sounds like it could be insufficient accelerator pump shot. Which
jets is he suggesting to be changed, and to what size? How did your
mechanic decide which jets to change and the new size - anything scientific or
just WAG? How will you find those jets for such an obsolete
carburetor? Even if jets for the later Carter AFB would fit, is the
internal fuel/air flow circuitry the same as for the WCFB? Since the
300C was originally intended to run on only one carburetor at low RPM, you may
have upset the A/F ratio right off idle when you converted to synchronous
(non-progressive) carburetor function - going too lean because of the
unintended extra airflow from the other carburetor. Have you
incorporated the carburetor modifications recommended by Chrysler in Technical
Bulletin #364 of July 16, 1957? That may/may not help, but it couldn't
hurt. I had Jim McGowan do that mod when he restored my carburetors -
excellent workmanship and results!
Depending on the elevation where you primarily operate, you might also want
to consider different metering rods, too, although that will not affect your
off-idle stumbling issue.
Ray Melton 300C in New Mexico
**********************************************************************
On 5/7/2022 12:31 PM, Gary Gettleman wrote:
To All the Great Folks in 300 Land.
Apparently the cam that we installed during the C engine rebuild is a
bit lumpy as compared to the stock cam.
Have what I would call a momentary stutter when the right foot presses
down.
We adjusted carb linkage so instead of running on 2 barrels it's now on
4, which has improved performance, but still get the occasional
hiccup.
Mechanic said we need to swap out the jets for larger size and that
will solve problem.
Figure someone else has had this problem and would appreciate your help
with this issue.
Thanks to all.
gary gettleman
300 C Export
For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang
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