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  Autolite 4100 1.12 carb

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Author Topic:   Autolite 4100 1.12 carb
SteveLaRiviere
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Posts: 42859
From: Saco, Maine
Registered: May 99

posted 10-31-2002 10:43 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I'm thinking of picking up a 4100 to play with, and I was wondering what are the best numbers to look for.

Alex, I'd love to hear your reccomendations, especially.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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KULTULZ
Gearhead

Posts: 768
From: Rockville, MD
Registered: Oct 2002

posted 10-31-2002 01:47 PM     Click Here to See the Profile for KULTULZ   Click Here to Email KULTULZ     Edit/Delete Message   Reply w/Quote
-Tech Info-Pony Carburetors-

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 10-31-2002 02:33 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by KULTULZ:
[b]-Tech Info-Pony Carburetors-[/B]

I'm familiar with them, thanks.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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KULTULZ
Gearhead

Posts: 768
From: Rockville, MD
Registered: Oct 2002

posted 10-31-2002 07:55 PM     Click Here to See the Profile for KULTULZ   Click Here to Email KULTULZ     Edit/Delete Message   Reply w/Quote
But did you read this?

Exclusive Autolite 4100 "Spread Bore"

For the last several years you have been reading about how wonderful the Autolite 2100 and 4100 carburetors are. The reasons that these carburetors perform the best on the planet are:

1. Annular fuel discharge - which atomizes fuel much better than any other metering system ever engineered in any carburetor.

2. A one piece float bowl and main body casting that eliminates leaks and maintenance.

3. A simple appearing design that does not require constant adjustment and attention while providing superior fuel economy and straight line performance!

Focusing in on the 4100, there were 2 size manufactured (really 3, but you will never see a 1958 only 1.19). The most common 1.12" venturi 600 CFM, and the much rarer 1.08" 480 CFM, are the ones you will come across.

The large 600 CFM (1.12) was factory installed on Galaxies and T-Birds with 352, 390 and 428 engines. The small 1.08 was used on "A" and "D" code 289's and 1966 only Galaxie and T-Bird's with 390 and 428 applications. (The big blocks used the small carburetor for emissions reasons.) The "K" code 289 HiPro was fed by unique 1.12 600 CFM manual choke performance calibrated 4100.

For a normal to even high performance 289 to function the best it must have a carburetor with around 480 CFM, and until now that meant the 1.08 Autolite. With the smaller size the driveability is flawless, i.e. no hesitation or flat spots and the fuel economy (with a 3.00 to 1 rear end) can exceed 20 miles per gallon. Add to that, the 1/4 mile performance is actually faster than the 600 CFM version.

There is a big problem with all this. A lot of enthusiasts have "listened" to the rave reviews of this engineering masterpiece and the supply of 1.08 4100's has been gobbled up all over the country. Just try and find one at a swap meet! Until now, the 1.08 was the only correct performance choice for the vast majority of 289/302 owners, and they either paid a hefty core charge ($150-200) or patiently scoured swap meets and salvage yards for a restorable core.

Pony Carburetors has made the "performance" search much easier. They have recently introduced a 1.12 venturi that works even better that the 1.08 on small blocks. By narrowing the primary venturi diameter to 1.00", it is now possible to get even better fuel economy, sizzling performance and driveability that begins to approach fuel injection. With the small primary (1.00") and the large secondary (1.1.8") the

Autolite now has the spread bore characteristics that were so desirable and utilized by several carburetor manufacturers in the late 60's and throughout the 70's.

The end result of a spread bore design maximizes fuel efficiency while maintaining neck jarring acceleration when the situation arises.

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SteveLaRiviere
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Posts: 42859
From: Saco, Maine
Registered: May 99

posted 10-31-2002 08:19 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by KULTULZ:
But did you read this?

[b]Exclusive Autolite 4100 "Spread Bore"

[/B]


Yes, I did. Thanks.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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Moneymaker
Administrator

Posts: 25539
From: Lyons, IL, USA
Registered: May 99

posted 10-31-2002 08:20 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yeah so?? What about it? Nothing new there.

Enyert's spread bore was devloped out of necessity due to lack of 1.08 cores. We are great friends and I do a lot of development R&D for him.
Pony Carb is s good vendor.

We don't use him for advice or troubleshooting much here at M&M.
We have ME!

Steve, ideally you would want any HIPO 1.12. That would be a C3, C4, C5, or C6 with a manual choke. There are pretty rare and getting very scarce.
As a second choice most of the C5 or C6 1.12's are prefered. It would also depend on if you needed that auto trans kick down or not.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
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!"

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 10-31-2002 08:31 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I can live without the kickdown. The manual chokes are that much better, huh? I like chokes.

If I wanted a speadbore, I'd adapt a Q-jet. I used to make them run really well.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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Moneymaker
Administrator

Posts: 25539
From: Lyons, IL, USA
Registered: May 99

posted 10-31-2002 08:33 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The manual choke Autolite HIPO carbs have much better boosters. You want boosters with at least 6 idle air bleeds. Also the transfer passage is 5/16 as opposed to 1/4 inch.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
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!"

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