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Author Topic:   4 corner idle
Mpcoluv
Gearhead

Posts: 1341
From: Charlotte NC usa
Registered: Apr 2001

posted 10-22-2002 09:34 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
How do you adjust idle mixture on the 4-corner idle carbs?
Just like a standard 4150?
Close the rear ones and adjust the front first, and then open the rears?

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 10-22-2002 10:56 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Pretty much. When done, reset the base/fast idle.

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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
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The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
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MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 10-22-2002 02:34 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
What is meant by closing the rear ones? Do you mean turn the carb. upside down and back off the secondary butterfly adjustment screw all the way, then tune the primary mixture for max rpm and vacuum, after which you would re-open the secondaries and set that mixture? Where do you set the secondary idle screws while those butterflies are closed and you're tuning the primaries? Please elaborate.

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Matt Fraley
1966 Mustang Coupe; 289, T-5, 9" 3.50
http://mdf99.tripod.ca/289_Side.jpg

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 10-22-2002 03:17 PM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
Closing the rear ones means turning the idle mixture screws until they lightly seat.

I have adjusted 4 corner idle mixtures by starting at 3/4 on all four and decent idle and then adjust each screw. Seems to work fairly well.

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 10-22-2002 03:25 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes MDF. Either invest in a tinny jewlers screw driver or remove the carb ans shut the secondaries (depending on the carb. dominators can be adjusted right side up. Adjust the mixture screws on the primaries, then repeat the proceedure for the secondaries.

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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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Mpcoluv
Gearhead

Posts: 1341
From: Charlotte NC usa
Registered: Apr 2001

posted 10-22-2002 04:09 PM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Yes MDF. Either invest in a tinny jewlers screw driver or remove the carb ans shut the secondaries (depending on the carb. dominators can be adjusted right side up. Adjust the mixture screws on the primaries, then repeat the proceedure for the secondaries.


Ar you saying that you close the secondaries and cover the idle transfer slot?

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MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 10-22-2002 04:11 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
While you've got the secondary butterflies fully closed and you're adjusting the primary idle mixture, where should you have the secondary mixture screws set? All the way in (leaned out) or should you have them turned out? If they should be turned out then how many turns?

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 10-22-2002 04:36 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes MPC.
MDF, you need to invest in either a vaccum guage or a good dwell tach. That will aid you in making the adjustments as accurrate as possible. This is not something that has universal instructions. All engines require different adjustments. Screw them all the way in (one at a time)first, then slowly begin turning them out until you get the highest idle (rpm). Repeat the other side, then front or rear.

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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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MDF99
Gearhead

Posts: 234
From: Hamilton, Ohio, USA
Registered: May 2001

posted 10-22-2002 09:21 PM     Click Here to See the Profile for MDF99   Click Here to Email MDF99     Edit/Delete Message   Reply w/Quote
Let me re-phrase, what I'm trying to get at is this: ONLY DURING THE TIME PERIOD that you're adjusting the primary mixture screws and you have the secondary plates totally closed, where do you want to have the secondary mixture screws TEMPORARILY set so that you get the primary mixture set properly? Sorry for the confusion. Do they need to be twisted all the way in or how much out during that time period? Thanks.

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 10-23-2002 01:41 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes, and try about 1/2 turn out as a baseline.

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

IP: Logged

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