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  '64 1/2 to '68 1/2 -- The Classic Mustang
  Ballpark jet size for Autolite 4100 on 289?

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Author Topic:   Ballpark jet size for Autolite 4100 on 289?
deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 09-23-2002 01:08 PM     Click Here to See the Profile for deadhead        Reply w/Quote
I purchased a 1.08 version Autolite 4100 but I don't know what vehicle it came from. There's no tag and the only casting numbers I can find are 6A E. It has #49 main jets and #67 secondaries. I'll be installing it on a .030 over 289 with home-ported heads, about 9.1:1 hypereutectic pistons, a CompCams XE256H, Hedman long tubes, and a standard Ford cast-iron four-barrel intake. She's backed by a C-4 and 2.80 open rear.

I need a place to start as far as jetting goes.

Thanks,

deadhead

Moneymaker
Administrator

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

posted 09-23-2002 02:07 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
53-55 in the primary with no power valve.
57 to 62 in the secondary.

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

NHRA/IHRA/SRA/MCA 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

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"

deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 09-23-2002 08:08 PM     Click Here to See the Profile for deadhead        Reply w/Quote
MoneyMaker,

Just curious. What would have been running 49s and 67s if you're recommending 53-55s and 57-62s?

deadhead

deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 10-20-2002 09:22 AM     Click Here to See the Profile for deadhead        Reply w/Quote
Alex,

I never got around to asking you, why no power valve in your recommendation above, and what would I put in it's place? If I leave the power valve in, what would your recommendation be?

deadhead

Moneymaker
Administrator

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

posted 10-20-2002 10:51 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
Holley power valve plugs screw right into an Autolite.

------------------
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!"

deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 10-20-2002 11:28 AM     Click Here to See the Profile for deadhead        Reply w/Quote
Alex,

Thanks for the quick reply. What differences will I experience in the way she starts and runs without the power valve?

The parts store opens at noon here.

deadhead

Moneymaker
Administrator

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

posted 10-20-2002 11:33 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
It will start fine. The idle may be a bit more ragged depending on your ultimate jet selection, and booster type. Make certain that you are using the correct base gasket also as that is critical.

------------------
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!"

deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 10-20-2002 11:42 AM     Click Here to See the Profile for deadhead        Reply w/Quote
I've got the carb on the stock Ford riser with the PCV fitting and that sits on a Weiand Action-Plus manifold. It seemed like the only way to get the PCV system set up. I don't appear to have any leaks, but...

deadhead

deadhead
Gearhead

Posts: 153
From:
Registered: Sep 2002

posted 10-24-2002 07:54 AM     Click Here to See the Profile for deadhead        Reply w/Quote
I had the joy of flooding the new engine here in our balmy 22 degree weather. She starts completely differently from her former self.

Because it was so cold, the gas just laid there on the butterflies, and I did notice some leaking. Who makes the best base gaskets for the 4100? Do I need a different shaped gasket for the carb-to-riser and the riser-to-manifold surfaces?

Thanks, yet again,

deadhead

Moneymaker
Administrator

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

posted 10-24-2002 10:37 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
22 degrees?
Best gaskets are #1909 Fel-Pro "stick um" performance gaskets.

------------------
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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