Gary, I have a new cam that I removed from a new 57 300 motor
(never run) as I wanted a bigger cam, $100 + shipping.
I also have set very good rocker shafts, solid lifters and
springs, pistons, pins and rings for 392 motor, .020 over. If anybody in need
Cheap!
Gary Nelson
Sent: Sunday, May 08, 2022 11:10 AM
Subject: Re: {Chrysler 300} Need more fuel!
Henry, et al
Thank you as well as all the others that have responded to my "Need
More Fuel!" SOS that I sent out yesterday afternoon.
Have to say I'm spot on when I refer to the 300 Brotherhood (Sisterhood
included) as "All the Wonderful Folks in 300 Club Land."
After reading each reply at least twice, I've come to the conclusion that
the factory engineers even after 65 years had/have the Best Designed 392 Hemi
for that Era.
That said, I'm on the search for an NOS Cam (kinda like the holy grail),
and plan B will have new cam ground to factory spec's.
Will let you all know once we get the isky out and factory spec'd one
in.
Again, My Thanks to All for your Very Insightful Comments.
Best Thoughts to All.
gary gettleman
santa cruz, ca
I
agree that timing should be checked and note that you shouldn’t have any
vacuum advance at idle (that will give you all sorts of grief). Your
vacuum seems very low, for any engine. I’d also check for a vacuum
leak.
When
you say idle was bumped up, are you using the factory way of adjusting the air
screws or are you opening the throttle? Might be best to start the
tuning procedure from scratch again using the factory manual (for the
300C).
A
few years back I rebuilt the 2 barrel stock carb on my wife’s Mustang to
factory spec. But when cold there was a slight hesitation when taking
off that even my wife noticed (grrrr). I double checked and found I had
put the accelerator pump linkage in a wrong hole for that engine/model (no
excuse - but there are 8 possible combinations!) After fixing that it
was perfect. Believe me that the factory engineers did know what
they were doing.
However,
if you alter the cam, all bets are off. Might need a bigger shot as
suggested before.
Good
luck
Henry
Initial Ignition timing also has an effect on
vacuum.
Just a
question...........
Why change a cam
from original to a problem? Am I missing
something?
-----Original
Message-----
From: Gary Gettleman <gary.gettleman@xxxxxxxxx>
To: Gary <garythepartsdoc@xxxxxxxxxxxx>
Cc: Ray
Melton <rfmelton@xxxxxxx>; 300
Club <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent:
Sat, May 7, 2022 7:19 pm
Subject: Re: {Chrysler 300} Need more
fuel!
Gary,
The more information I get the more confused I
become.
Leaning
towards replacing the isky cam that hot heads recommend and going with Clay
Smith cam that Rob Kern likes.
Have
low vacuum between 6-8 lbs and that's after idle was bumped
up.
With
a No. and letter drill set you can dill jet to any size you need.
Sent:
Saturday, May 07, 2022 12:25 PM
Subject:
Re: {Chrysler 300} Need more
fuel!
Ray,
Thank you for your way over my pay grade
response.
Mechanic is
very talented and has some very high $$$$ builds to his
credit.
That said,
his main business is high end Resto Mods.
Did a
buddies '41 Cad coupe on Art Morrison frame with 2021 Cadillac Hot Engine
and 8/10 ? speed tranny.
Very High
end builds, yet he will work on old Detroit iron like our beloved
300's.
I like your
suggestion re the service bulletin update and will start there and let you
know how it goes.
The once "Golden State" (but not so much any more) of
California.
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.
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