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  Full Size Fords, Mercurys and Lincolns
   Autolite 4100 venturi cluster switch

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Author Topic:   Autolite 4100 venturi cluster switch
Tom R
Journeyman

Posts: 9
From: Chicago, IL,
Registered: Jan 2006

posted 01-24-2006 11:32 AM     Click Here to See the Profile for Tom R        Reply w/Quote
Hi. While rebuilding a C6AF-L 4100 recently, I noticed one of the brass main "down-tubes" on the primary venturi cluster had a crack running the length of it. I brought it to United Carburetor here in Chicago to see if they could repair it. They couldn't; But they did send me home with a venturi they think will work. The new one has a different code on the bottom and the air bleed holes seem, by eyeball, slightly larger. Is there any literature I can reference to see what the original application was, or is it just a wait and see?
I'm actually putting this on a '67 boat with a '69 351W - boats are kind of like driving uphill constantly - so I'd rather it run richer rather than leaner - I think? I'm pretty new to this game, so any help would be appreciated.

KULTULZ
Gearhead

Posts: 959
From: Rockville, MD
Registered: Oct 2002

posted 01-30-2006 06:43 PM     Click Here to See the Profile for KULTULZ        Reply w/Quote
quote:
They did send me home with a venturi they think will work. The new one has a different code on the bottom and the air bleed holes seem, by eyeball, slightly larger. Is there any literature I can reference to see what the original application was, or is it just a wait and see?

Unless there was a TSB released from FORD at some point, there is no rating chart that I am aware of. Now that being said, there is more than likely one enthusist over the years that has made personal charts or a master rebuilder like PONY CARBURETORS has done the research. Now whether they will share that information...

As long as the carb was in service, I would imagine one would have to go to a flow bench for comparisons.

------------------
Am Looking For Factory/Aftermarket Speed Parts For The MEL (MERC-EDSEL-LINC-TBIRD) Engine Family (383-410-430-462) Produced From 1958 To 1968

Also Early FORD Special Service Tools

-Mercury-Edsel-Lincoln-
[img]http://www.gofastforless.com/junk/mercury.gif[/img][img]http://www.squarebirds.org/images/tbird_symbol.gif[/img]

Tom R
Journeyman

Posts: 9
From: Chicago, IL,
Registered: Jan 2006

posted 01-30-2006 09:16 PM     Click Here to See the Profile for Tom R        Reply w/Quote
Thanks for the reply. I was hoping someone might know. I've searched online altogether too many hours trying to track this down. You're right - actually talking to an expert in the field would have saved me much time. Does anyone know if Ford has a tech line?
The carb was originally calibrated for a '66 352; but who knows now. It'll be interesting to find out how this carb performs over the 2bbl carb it's replacing. It has to be one of only a few marinized Autolite 4100's out there. I replaced the float overflow tubes with brass J-tubes, blocked off the original external float bowl vent holes and tapped one-way valves onto the top corners instead (for flame arrestor clearance). In case a float sticks, this should keep gas out of the bilge (very bad), and down into the carb where it'll just flood the engine.

KULTULZ
Gearhead

Posts: 959
From: Rockville, MD
Registered: Oct 2002

posted 01-31-2006 02:54 PM     Click Here to See the Profile for KULTULZ        Reply w/Quote
quote:
Does anyone know if Ford has a tech line?

I hardly consider myself an expert... ...just an informed FORD FREAK...

There is no TECH LINE where this information would be readily available, especially considering the number of years it has been out of production.

The complete list would be available in the FORD P&A CATALOG, but it would not give flow characteristics, only part nos. and applications. Most likely there is a technical service bulletin of that period that would give you at least most of the desired information.. PONY CARBS will have this information.

Tom R
Journeyman

Posts: 9
From: Chicago, IL,
Registered: Jan 2006

posted 01-31-2006 06:25 PM     Click Here to See the Profile for Tom R        Reply w/Quote
Thanks Kultulz, I'll drop Pony Carbs a line. Nothing ventured, nothing gained.

KULTULZ
Gearhead

Posts: 959
From: Rockville, MD
Registered: Oct 2002

posted 02-01-2006 09:27 AM     Click Here to See the Profile for KULTULZ        Reply w/Quote
quote:
Originally posted by Tom R:

Nothing ventured, nothing gained.


Good play on words...ventured...venturi...

Get it?

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 02-01-2006 02:24 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
How many air bleed holes does the replacement have?

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

Tom R
Journeyman

Posts: 9
From: Chicago, IL,
Registered: Jan 2006

posted 02-01-2006 02:33 PM     Click Here to See the Profile for Tom R        Reply w/Quote
I should have said nothing venturied... I talked to Pony Carburetors today - The guy in parts was real helpful. It turns out what I thought was a problem wasn't really a problem. He said that happens all the time and it shouldn't affect performance - that's good enough for me.
Unfortunately the guys at United carburetor mangled the brass downtube a bit while trying to fix it; but I think I unmangled it enough to work. Apparently swapping venturies really isn't a very good idea, and the chances that the one United sent me home with would perform well in my carb were pretty slim. Crisis over, I think. If not - though they wouldn't sell one outright; he said they could repair my cluster for $45. That worked out well.

Tom R
Journeyman

Posts: 9
From: Chicago, IL,
Registered: Jan 2006

posted 02-01-2006 02:42 PM     Click Here to See the Profile for Tom R        Reply w/Quote
Sorry, I didn't see your question before my last post.
They both have 8 air bleed holes - 2 in front, 2 in back, 2 on the sides and 2 on top.

Tom R
Journeyman

Posts: 9
From: Chicago, IL,
Registered: Jan 2006

posted 02-01-2006 04:19 PM     Click Here to See the Profile for Tom R        Reply w/Quote
Well, scratch that post stating the problem solved. I couldn't leave good enough alone before I made a true mess of the original. The brass tube broke off when I was tweaking it just that last little bit. It really went downhill when I tried drilling it out - why wait for a drill press? Anyway, it's now beyond salvage. I wish I spent that $45 now.

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 02-06-2006 06:25 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
E-mail me the numbers from the bottom of the booseters you need.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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