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Author Topic:   Four corner idle adjustment
V8 Thumper
Gearhead

Posts: 4044
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 04-19-2003 10:03 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Is there any trick to it?

On my 3310, I drilled holes in the primary butterflies to facilitate idle tune, and it worked. Am I likely to need to do the same to a DP? If so, would I drill both primary and secondary butterflies?

You guys are going to get real tired of me asking DP questions

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1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9"

All Blue Oval, no blue bottle
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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 04-19-2003 10:09 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I would not drill anything yet Todd.
Try it our with a 5.5 or 4.5 PV first.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
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NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
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!"
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jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 04-19-2003 11:27 AM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Todd, you can also turn the carb upside down and adjust a little more opening in the secondaries with the small set screw in the back if you need a tad more airflow after the PV change. I'd try the PV first though. I will admit to drilling the butterflies in the past, but that little adjustment screw is there if you need it.

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Jerry
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
Jimmy: ( S-10 driver/friend ) Hey Jer how do you like my flames I painted on the old Bowtie?
Jerry: Nice but you didn't have to do that, if you ever get it going fast enough at the strip it'll catch fire.

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