RE: [Chrysler300] Carburetor rebuilder in SoCal

["'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

Agree air flow between both sides at idle off choke has to be very close on
ram. However,  vacuum inside manifold is the same on both sides on ram due
to balance tube, (unlike some British cars or bikes ) and if you carefully
count air valve opening in degrees / turns from zero on ram  it (air)
should be close. (  "balancing" is mostly  idle air flow, on otherwise
correct carbs..) ; the main difference on ram carbs is you do not open
throttle with an idle screw a bit for that air setting . That brass air
valve thing does it instead. That said, a Unisyn makes sense to check ..
But throttle valves MUST be closed all the way (linkage) I think the slight
slop in ram linkage is there to be sure they are both independently closed
against each one's stops . You can get a great balance reading , but it can
be  partially air valve flow and partially throttle not closed. Especially
if others have been in there...

 

Vacuum tank leaks too.. My first F , way back, had a  rust hole in vacuum
tank behind the headlights, defeated my tuning efforts for weeks. PB booster
too. And another F had a hole under carb plenum into exhaust heat space on
ram, because heat riser had been stuck "on" by rust , (the way it sits in
storage) melted a hole in aluminum floor of ram. Brings up leaving that heat
valve tied open, in mild climates. ..but ."not original" !!

 

Note how by 63 J they got rid of all that controlled heater / choke stuff,
and none made in 62 standard production ; There are good reasons for all
that... And most hi po race rams I have seen  had been converted to water
heating.

 

One of the biggest inherent issues with rams is if the two chokes pull off
unevenly, one ahead of other,  the rough idle grief starts..and they will DO
that, at warm up just how bad and for how long  is the question, as well as
initially if on highway or in city, so making sure exhaust heat valve is
working perfectly , thermal spring has not been mangled, and then cut and
try choke adjustment until chokes pull off reasonably together from cold
start as best you can. Have to keep blipping throttle to see ? Less an issue
in warm climates. 

 

Other sneaky problem is if idle mixture screws have a slight step worn into
them along cone from thousands of adjustments (the golden screwdriver was
here too) . Then it acts as on off valve suddenly during turning, instead of
smooth adjustment . Key clue..idle screws seemingly do nothing to change
anything ! Or suddenly stalls in 1/8 turn while turning  . As mentioned
before,  Edelbrock AFB needles fit, and are enough different shape they fix
this. Goes without saying use vacuum gauge,  read for max. 

 

Grey beard at work..why it is grey.

 

John

 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of nick@xxxxxxxx [Chrysler300]
Sent: Sunday, February 09, 2020 5:07 PM
To: 'Chrysler 300 List'
Subject: RE: [Chrysler300] Carburetor rebuilder in SoCal

 






I had to sync my carburetors up on my 300F. You use a tool called a Uni-Syn.
You only need one as you do each carburetor separately. It measures the
airflow through the carburetor and you want them to match. They are
typically used on foreign cars with smaller carburetors so the tool does not
fit the Carter AFB carburetor air horn directly. What I found was that a
standard 1 pound cottage cheese or sour cream container fits the top of the
carburetor perfectly and then you cut a hole in the bottom of the container
for the  Uni-Syn to sit on.  I don't have a picture of the Uni-Syn on the
carb but this shows the container fitting over the carb. Also a handy thing
to have around if you're working under the hood with the air cleaners off to
keep stuff from getting in the carbs.

 

https://photos.app.goo.gl/hM6SdeRU5VpLpU6w5

 

From: Chrysler300@xxxxxxxxxxxxxxx <Chrysler300@xxxxxxxxxxxxxxx> On Behalf Of
Andrew W QuietLion79@xxxxxxxxxxx [Chrysler300]
Sent: Sunday, February 9, 2020 1:40 PM
To: John Grady <jkg@xxxxxxxxxxxxxxxxx>; Tom Hergert tallzag@xxxxxxxxx
[Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx>
Cc: spiers@xxxxxxxxxxxxxx; Chrysler 300 List <Chrysler300@xxxxxxxxxxxxxxx>;
Jim Pristelski <ajp002@xxxxxxxxx>
Subject: Re: [Chrysler300] Carburetor rebuilder in SoCal

 

  

Very good points, John. I just sent Scott at Harms Auto a message. He isn't
cheap, but since he is good with ram setups I think it is worth it. After
the base price of $200-250 per carb, you are paying for the experience.
Normally, I like to do everything myself and have been tempted to rebuild
them, as I have rebuilt a few carburetors myself, mostly successfully.
However, thinking about trying to balance them myself and futzing around
with them and never having the car run perfectly seems like a distinct
possibility, even though I have the 300J supplement manual. I think I will
request a step by step from Scott to set up and tune them (possibly rebuild
as well). If i do get that information, I can pass it along for future
reference.

 

Thanks for the (nearly instantaneous) help!


Andy

 

  _____  

From: John Grady <jkg@xxxxxxxxxxxxxxxxx>
Sent: Sunday, February 9, 2020 9:39 AM
To: Tom Hergert tallzag@xxxxxxxxx [Chrysler300]
<Chrysler300-noreply@xxxxxxxxxxxxxxx>
Cc: Andrew W <QuietLion79@xxxxxxxxxxx>; spiers@xxxxxxxxxxxxxx
<spiers@xxxxxxxxxxxxxx>; Chrysler 300 List <Chrysler300@xxxxxxxxxxxxxxx>;
Jim Pristelski <ajp002@xxxxxxxxx>
Subject: Re: [Chrysler300] Carburetor rebuilder in SoCal 

 

This is a really important question I think . How do we know who is good, or
in my case , still good? Some of the older big names who routinely did a
great job (why name anybody...) now have young kids putting carbs together ,
often all wrong .... that business is about gone in a commercial sense .
And my former place had so many complaints -- I hear they now just sell
kits. Nothing is worse than a poor rebuild, factory  things messed up .. in
my case , the   Fit of throttle plates. Jamie has seen same thing, even
worse, parts from the two carbs all mixed up . Shows guy who did it was
clueless.  
I often wonder whether they they really DO need "rebuild "- except for
aesthetics ? 
Thoroughly cleaning , with a Carter book, new inlet valves and float
settings , accell pump leather and gaskets , new idle needles done carefully
- might come out better than any 100 % disassembly . After all what IS a
rebuild? What you want is to fix what is wrong . J carb very special , few
around . Maybe this fellow is terrific , hope so , but anecdotes sort of are
not the test .

... I found a guy does almost all the race carbs around here ( NE)
,relatively  good business at his home , a garage behind just for this ,
and half the usual prices , but have not used - so I am reticent to put up a
name .   By the way fixed price up front , for any normal 4 bbl. - Not " we
will see " and then costs 900 for two carbs. What is normal ? Strikes me 150
-200 area seems right for time it takes .  

But that "check local race guy " way seems a logical place to go .. ask
local successful engine builders - who does their carbs ? Start some kind of
club data base ? Real results . A club survey? 
Bob Merritt ( once again!) working on a better rebuilding instruction  set ,
on 300 site, to do it  yourself.  ( thank you Bob)
Except for repairing badly worn throttle shafts , fairly rare on our carbs,
you can do a good job if careful .  
Some people within our club are in fact way better at carbs than " carb guy"
.. ; - the way their  cars run show it ... 
Just an observation on this issue-- no aspersions cast. 
My success with external "rebuilds" hovers   around  50% . Cost me a lot of
time later in some cases .. Generally able to fix it eventually, but that
goes full circle to do it right yourself ...     then you know issues  about
your own carbs too . 
Good question ... 

Sent from my iPhone not by choice 

> On 9 Feb 2020, at 11:55 am, Tom Hergert tallzag@xxxxxxxxx [Chrysler300]
<Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
> 
> Best afb rebuilder is Scott Smith at Harms Auto in Spokane, Washington..
> 
> Sent from my iPhone
> 
>> On Feb 9, 2020, at 8:39 AM, Andrew W QuietLion79@xxxxxxxxxxx
[Chrysler300=
> ] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
>> =20
>> =EF=BB=BF
>> Hello, I was looking to have both my 3505s carbs for my 300J rebuilt and
=
> was wondering if there were any good rebuilders that someone wou

 










[Non-text portions of this message have been removed]



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Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
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