RE: [Chrysler300] 400HP F carbs / AFB maladies
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RE: [Chrysler300] 400HP F carbs / AFB maladies



I do not know the specifics in any given carb, although each AFB number has a ‘list” of what the parts are—someone in club might know that data  –which relates to what is in the 400HP carbs?  Maybe on tech site, or might end up there..; Edelbrock has a lot of relevant AFB data too. But the bottom line is that even knowing all that, you would never notice jets are switched in your own carb , primary to secondary. . Auugh

 

Steps / taper in metering rod are related to carb tune and critically,  jet size they slide in ; you can change all that, ---but stock is fine!! As long as put together right. One half Azz rebuild in past scrambles all that. 

 

Also related, new Edelbrock carb mixture screws fit , they fix many many problems with worn seats as the taper seems different. It will actually adjust as you would expect a normal carb to do, for once! Many stock ram carbs are essentially not adjustable, it goes from full on  to full off in ¼ turn (big discovery for me, only because I have 4-5 ram cars and adjusting experience was wildly different ) ; the stock screws are smaller, get “depressed” rings around the screw taper from  1000 golden finger adjustments, ( a relative of golden screwdriver) and also I think the repeated start from zero, all the way in  thing opens up,  or hurts the seats in carb body, , giving this on off thing as ring shuts like a faucet washer. . The new screws are like 10$ for two, I think they seat in a new place in carb it all works like new..my experience. If you do not know this, you can go nuts with screws that seem to do nothing ,( are on or off)  poor running rams.  I admit to have been there, more times than I might like to admit, in past. Why does this screw do nothing? Keep track,  all open same amount. Air valves too. If taper and seat ok. Hey ---it idles ok! Even FSM directions work!

 

From: Anna F Noia [mailto:sa-noia@xxxxxxxxxxx] 
Sent: Tuesday, September 27, 2016 9:46 AM
To: John Grady; chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] 400HP F carbs / AFB maladies

 

John

Very interesting on the Carb's metering rods. You are correct, NO ONE looks at those in detail, correct? They (me, most) assume that they are the same,  Are there any spec's on bore and rod diameters that can be referenced? I will add this to the ever growing list of things to worry about when playing with my toys carburator's! Thanks you.

Best Regards,
Stephen A. Noia
1-408-210-4736 cell

 

On Monday, September 26, 2016 1:24 PM, "'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

 

  

I just noticed in carb listings on our tech site (thank you for that site, and to those behind it---..it gets better and better) that the 400HP F,G H had different AFB carb  #s  than the regular ram cars (which #’s varied by year) ; The high performance “400HP” cars all had the same carb , however, --across those years. .

 

Does anyone know what was different on those 400HP carbs ? Larger throttle bores? Jetting? 

 

While on carbs, JY Chouinard  discovered the hard way , that the jets had been switched front to back in a 300F  car we were working on. Carb does not work at all then,  as metering rods are matched to specific jet opening, and placement in primary or secondary positions in carb  ; assumptions about which side has the big jets are not always right . I would never have found that personally, you just assume it is right. 

 

Big find by J-Y! Jets and metering rods have to obviously be in right places. (we know that) But no one is looking for that on the jets.

 

So , something else to be aware of re : balky ram carbs. Jets can be symmetrically mixed up in a rebuild. I also believe the loose venturis held by screws are specific side to side and that the gaskets for those can be put on upside down or switched in position, obstructing some channels . Some channels seem to be blocked off on purpose by those too. Match all parts to metal holes in the carb body and matching venture carefully. Slight differences! That happened to a carb that ‘would not work right” ; I had done it, I did not realize differences in drilling and the little gaskets.. Some carb kits seem to use kind of a universal gasket here, further mixing up the possibilities. It might not be you, it might be someone before you. 



 

On Monday, September 26, 2016 1:24 PM, "'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

 

  

I just noticed in carb listings on our tech site (thank you for that site, and to those behind it---..it gets better and better) that the 400HP F,G H had different AFB carb  #s  than the regular ram cars (which #’s varied by year) ; The high performance “400HP” cars all had the same carb , however, --across those years. .

 

Does anyone know what was different on those 400HP carbs ? Larger throttle bores? Jetting? 

 

While on carbs, JY Chouinard  discovered the hard way , that the jets had been switched front to back in a 300F  car we were working on. Carb does not work at all then,  as metering rods are matched to specific jet opening, and placement in primary or secondary positions in carb  ; assumptions about which side has the big jets are not always right . I would never have found that personally, you just assume it is right. 

 

Big find by J-Y! Jets and metering rods have to obviously be in right places. (we know that) But no one is looking for that on the jets.

 

So , something else to be aware of re : balky ram carbs. Jets can be symmetrically mixed up in a rebuild. I also believe the loose venturis held by screws are specific side to side and that the gaskets for those can be put on upside down or switched in position, obstructing some channels . Some channels seem to be blocked off on purpose by those too. Match all parts to metal holes in the carb body and matching venture carefully. Slight differences! That happened to a carb that ‘would not work right” ; I had done it, I did not realize differences in drilling and the little gaskets.. Some carb kits seem to use kind of a universal gasket here, further mixing up the possibilities. It might not be you, it might be someone before you. 



 



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



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