Re: {Chrysler 300} Need more fuel!
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Re: {Chrysler 300} Need more fuel!



If you need smaller, solder and re-drill.
 
From: Ray Melton
Sent: Saturday, May 07, 2022 1:27 PM
Subject: Re: {Chrysler 300} Need more fuel!
 

True - But in this case, how does the mechanic know what size to drill?  And which jet(s)?  And in rear carb only or both?  Are replacement jets available if the bigger jet produces no change or makes things worse?  Drilling is largely irreversible.

Good instrumentation on a series of chassis dyno runs could really help pinpoint the problem and lead to optimum performance.  (Lotsa labor changing jets - assuming you have alternatives readily available - and making adjustments in between runs = pretty costly, but even at $100/hr could be worthwhile investment. )  Unfortunately, I don't have access to such facilities anywhere near my small town in New Mexico. 

A good place to start with the carburetors is with Chrysler Service Bulletin #1002-CH, Dated March 1, 1957.  (Available through Club website - Technical)  And of course, the Factory Service Manual.

Personally, I would go back to the original stock progressive configuration, ensure baseline adjustments per the Bulletins and Service Manual, then perform the recommended carb modifications and go from there.

Ray Melton

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On 5/7/2022 1:58 PM, Gary wrote:
Gary G.
 
With a No. and letter drill set you can dill jet to any size you need.
 
Gary
 
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.
 
Best Regards
 
     gary gettleman
 
     The once "Golden State" (but not so much any more) of California.
 
On Sat, May 7, 2022, 12:07 PM Ray Melton <rfmelton@xxxxxxx> wrote:

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

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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
 
 
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