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Author
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Topic: Ballpark jet size for Autolite 4100 on 289?
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deadhead
Gearhead Posts: 153
From:
Registered: Sep 2002
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posted 09-23-2002 01:08 PM
 
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
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 09-23-2002 02:07 PM
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!"
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deadhead
Gearhead Posts: 153
From:
Registered: Sep 2002
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posted 09-23-2002 08:08 PM
MoneyMaker,Just curious. What would have been running 49s and 67s if you're recommending 53-55s and 57-62s? deadhead
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deadhead
Gearhead Posts: 153
From:
Registered: Sep 2002
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posted 10-20-2002 09:22 AM
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
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 10-20-2002 10:51 AM
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!"
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deadhead
Gearhead Posts: 153
From:
Registered: Sep 2002
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posted 10-20-2002 11:28 AM
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
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 10-20-2002 11:33 AM
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!"
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deadhead
Gearhead Posts: 153
From:
Registered: Sep 2002
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posted 10-20-2002 11:42 AM
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
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deadhead
Gearhead Posts: 153
From:
Registered: Sep 2002
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posted 10-24-2002 07:54 AM
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
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 10-24-2002 10:37 AM
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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