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Author
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Topic: Calling all Holley Experts
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wadeb3
Gearhead Posts: 151
From: Winston-Salem, NC
Registered: Jul 2004
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posted 10-24-2005 08:43 AM
   
Need some opinions from the Holley experts out there: (I��ve read a few threads concerning this same problem, but each case seems a little different so I thought I��d run my specific scenario by the board.) I��ve got a 289 bored .030 over, .471 lift cam, Performer intake, manual transmission, Holley 600cfm vacuum secondaries. I had a stumble when I would first crack the throttle, so I swapped out the stock 65 power valve for 55. That seemed to help a little so I went to a 45 power valve and that helped a little more. But it still stumbles slightly, especially on inclines. If I��m rolling already, of I��m on level ground or downhill, it does just fine. But if I��m heading uphill, even slightly, I really have to feather the clutch out. I��ve had a couple of people tell me I shouldn��t go to a 35 power valve. What do you guys think? Should I try the 35 or is there something else I should try next? Or am I being way too picky and just learn to live with it? Thanks!------------------
Wade
'67 A-code Fastback "Well-weathered leather
Hot metal and oil
The scented country air
Sunlight on chrome
The blur of the landscape
Every nerve aware"
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capri man
Gearhead Posts: 7986
From: doerun, ga.
Registered: Nov 2000
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posted 10-24-2005 09:12 AM
im a long way from an expert but what size squirter does it have? you might want to try a little larger one,------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg
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wadeb3
Gearhead Posts: 151
From: Winston-Salem, NC
Registered: Jul 2004
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posted 10-24-2005 09:18 AM
I believe it came stock with a 64 primary jet and a .031 pump discharge nozzle.
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Wade
'67 A-code Fastback "Well-weathered leather
Hot metal and oil
The scented country air
Sunlight on chrome
The blur of the landscape
Every nerve aware"
IP: Logged |
capri man
Gearhead Posts: 7986
From: doerun, ga.
Registered: Nov 2000
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posted 10-24-2005 10:02 AM
if you have access to some squirters, try something in the high 30s.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg
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mustangboy
Gearhead Posts: 1198
From: Ont, Canada
Registered: Mar 2002
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posted 10-24-2005 11:20 AM
Have you tried some different accelerator pump cams?I had almost the exact same combo and just moving the screw to the second position in the cam helped a lot.I also spent a lot of time fine tuning the idle mixture.What is your vacuum reading at idle??..I'm assuming you should have lots of vacuum with what sounds like a fairly mild cam..It seems strange that going to a pv that opens later and later is helping you since your vacuum level would have to go below the number on the pv before it would have any affect  ------------------
68 J-Code,Sprint,306 4 speed,4.11s 13.69@101...............
66 coupe 289 4 speed, 3.20 cruiser http://mustangsandmore.50megs.com/MembersPics/mustangboy.html http://mustangsandmore.50megs.com/MembersPics/mustangboy2.html [This message has been edited by mustangboy (edited 10-24-2005).]
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Fastymz
Moderator Posts: 21741
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-24-2005 11:40 AM
I'd start by checking your float level. Make sure it's not alittle high? The stock 600 should have come with 28 nozzles,like Mike said try some a few steps higher.------------------
Mustangsandmore member #351w
oddly obsessed with big scoops on little Mustangs 65 BIG Boss hood scoop My Pics "Politics is the art of looking for trouble, finding it, misdiagnosing it and then misapplying the wrong remedies." Groucho Marx
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V8 Thumper
Gearhead Posts: 4692
From: Phoenix, Arizona
Registered: Dec 2001
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posted 10-24-2005 11:52 AM
By going with a smaller number power valve, you're delaying the power enrichment circuit. If it stumbles immediately and then goes, larger shooter. If it starts to take flight and then hickups, smaller shooter. The smaller shooter 'times' the shot out longer, just opposite the larger one that delivers all its fuel right now. If you do go bigger with the shooter, it may want the power enrichment circuit back again sooner so you'll probably wind up putting the 6.5 pv back in it. Even still, make only ONE change at a time when carb tuning! That way you know which change helped and which one did not, and which one to undo if necessary.All this assuming that your're ignition system is in working order and you have no vacuum leaks. ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" 12.58/110 on street tires, more to come;) All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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wadeb3
Gearhead Posts: 151
From: Winston-Salem, NC
Registered: Jul 2004
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posted 10-24-2005 12:36 PM
Thanks for all the tip, y'all. It does stumble immediately and then gets caught up. I might try a bigger nozzle and see what happens. I'll let you know.------------------
Wade
'67 A-code Fastback "Well-weathered leather
Hot metal and oil
The scented country air
Sunlight on chrome
The blur of the landscape
Every nerve aware"
IP: Logged |
steve'66
Gearhead Posts: 9644
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-24-2005 11:30 PM
Yes,A bigger squiter will do it. SteveW
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wadeb3
Gearhead Posts: 151
From: Winston-Salem, NC
Registered: Jul 2004
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posted 10-25-2005 08:43 AM
Okay, cool. According to the Holley literature it's got a .031 nozzle in there now. Should I go up a couple of sizes at a time? Looks like I can get a .032, .035, .037, .040 and on up. Should I skip a couple of sizes and try maybe the .037 to start out with?
Thanks!------------------
Wade
'67 A-code Fastback "Well-weathered leather
Hot metal and oil
The scented country air
Sunlight on chrome
The blur of the landscape
Every nerve aware"
IP: Logged |
capri man
Gearhead Posts: 7986
From: doerun, ga.
Registered: Nov 2000
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posted 10-25-2005 09:59 AM
think i would try about a .037 first. i actually had to go to a .045 on mine before it cleared up.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg
IP: Logged |
wadeb3
Gearhead Posts: 151
From: Winston-Salem, NC
Registered: Jul 2004
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posted 10-25-2005 12:44 PM
Thanks, Mike. Quick (and maybe stupid) question: What's the difference between straight and tube type nozzles? I see both on Summit and Jegs.
Thanks.
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Moneymaker
Administrator Posts: 28191
From: Lyons, IL, USA
Registered: May 99
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posted 10-25-2005 06:40 PM
Tube nozzels go down into the venturi further and are more efficiant.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 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!"
www.moneymakerracing.com
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CAPTAIN CLAMHEAD
Journeyman Posts: 52
From: DETROIT MI
Registered: Feb 2003
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posted 10-25-2005 06:52 PM
YOU ARE CORRECT SIR!------------------
IF I DON'T KNOW WHAT'S WRONG WITH IT NOBODY DOES.
GIVE ME A TEST, I'M SIMPLY THE BEST! SUPPORT HILARY CLINTON IN 2008! YOUR COUNTRY IS AT STAKE!
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Moneymaker
Administrator Posts: 28191
From: Lyons, IL, USA
Registered: May 99
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posted 10-26-2005 12:31 PM
CC my man!
Glad to have you back!  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 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!"
www.moneymakerracing.com
IP: Logged |
CAPTAIN CLAMHEAD
Journeyman Posts: 52
From: DETROIT MI
Registered: Feb 2003
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posted 10-26-2005 05:56 PM
THANK YOU SIR, I AM VERY HAPPY TO BE HERE. I HAD FORGOTTEN ALL ABOUT THIS SIGHT, BUT THEN I REMEMBERED. KEEP THE FORD FAITH! ------------------
IF I DON'T KNOW WHAT'S WRONG WITH IT NOBODY DOES.
GIVE ME A TEST, I'M SIMPLY THE BEST! SUPPORT HILARY CLINTON IN 2008! YOUR COUNTRY IS AT STAKE!
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Stang72
Gearhead Posts: 303
From: Arkel,Zuid-Holland,Holland
Registered: Jan 2003
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posted 10-27-2005 01:58 PM
also try looking at your acc pump and pump cam.. see if you can make it react sooner,. you can put a .045 squirter in it but if there's no fuel to be squirted..my 02 cents
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Jake11
Gearhead Posts: 207
From: Banning,Ca,USA
Registered: Oct 2005
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posted 11-02-2005 12:52 AM
Is the checkball in the front floatbowl
still there? Is the Fuel squirting as soon
as you open the throttle?
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