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  AUTOLITE 4100 , 1.08 OR 1.12 VENTURI ?

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Author Topic:   AUTOLITE 4100 , 1.08 OR 1.12 VENTURI ?
johnmustang
Gearhead

Posts: 1778
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001

posted 08-10-2002 09:18 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
I have both the 1.08 and 1.12 venturi , autolite 4100 carbs. Which one would work better on my 65 , 289 mild build 268h comp cam , C4 2.80:1 soon to be 3.25:1 rear end. The 289 has been built to pretty much match the cam. The car pulls very good at this time , with 1700 miles on it. What would be the advantage , and or , disadvantage to both of these carbs on my car. Ultimatley I am looking for your answers as to which one I should be using and why. What are the true CFM`s on these carbs , and , would a 600 be too much for my 289 set-up. I thank all of you in advance for your input into these questions , it is important to me. BTW , the intake manifold is a stock 65 cast iron model as are the exhaust manifolds, coming to a 2 1/2 inch system all the way back from the collectors.

JOHN

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65 2+2 FASTBACK
68 COUPE
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
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Moneymaker
Administrator

Posts: 13252
From: Lyons, IL, USA
Registered: May 99

posted 08-11-2002 12:41 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The 1.08 carb is 400-480 CFM. The 1.12's are 580-620 CFM. It all depends on the condition and wear of the casting. If you plan on keeping the restrictive exhaust manifolds then I would recomend a 1.08.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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johnmustang
Gearhead

Posts: 1778
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001

posted 08-12-2002 11:02 AM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
The 1.08 carb is 400-480 CFM. The 1.12's are 580-620 CFM. It all depends on the condition and wear of the casting. If you plan on keeping the restrictive exhaust manifolds then I would recomend a 1.08.


If I end up using the 1.12 will it be too much carb for the car ?

JOHN

------------------
65 2+2 FASTBACK
68 COUPE
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

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Moneymaker
Administrator

Posts: 13252
From: Lyons, IL, USA
Registered: May 99

posted 08-12-2002 11:11 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Not really. It would just perform better overall with headers.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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johnmustang
Gearhead

Posts: 1778
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001

posted 08-12-2002 12:11 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Not really. It would just perform better overall with headers.


Not allowed to have headers on my car , or else , I will lose my British columbia collector plates , and , my insurance will go up by about $900.00 to $1000.00 . Would it help to take out the dremel and play with the exhaust manifolds a little bit , or , am I better off to try and get a set of 351w manifolds , and , will the 351w manifolds clear my power steering ? Thanks for your help with this Alex.

JONH

------------------
65 2+2 FASTBACK
68 COUPE
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

IP: Logged

Moneymaker
Administrator

Posts: 13252
From: Lyons, IL, USA
Registered: May 99

posted 08-12-2002 12:38 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Then stay with the 1.08. The 351 manifolds are not worth the effort. FoMoCo had the option of installing both carbs on Mustangs in 1965-66 and there was a reason they chose the 1.08. They knew that the OEM manifolds sucked. HIPO's got the 1.12 mostly becuase or the better manifolds. Not just the cam.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

IP: Logged

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