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Author
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Topic: Accelerator pump adjustment ??
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 05-20-2003 01:58 AM
   
I just don't get it,I know your to open the throttle all the way.And then see that you have at least .015 clearnce.With any drag,but how can you get that.If the pump arm is always putting pressure on the pump cam arm.
So what is that I'm missing?
I open mine all the way and I can get the .015 between the two but I have force it in.And it just moves the accelerator pump move down alittle to allow it to fit.When the throttle is all the way open,the accelerator pump still can be moved open another 1/8"or so.Is that they all are.
I just don't get it I've read and reread all about it.But there is something I'm not getting ? Thanks Ron ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 05-20-2003 02:03 AM
Should the cam arm make the pump open all the way?
Or is there a reason why the cam arm stops before the pump is all the way open?Sorry for all the questions but this about the last of the holley I still don't get.
I wish I can see some one else adjust theres.I learn so much better by matching then reading about it.  ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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ted
Journeyman Posts: 62
From: Central Texas
Registered: May 2003
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posted 05-20-2003 06:12 AM
You should have 0.015" before the accelerator pump diaphragm bottoms out. That means you should be able to push the arm connected to the cover down ~0.015" with the throttle in the wide open position. You said that you could move your arm down ~1/8"? This means you've probably got 0.125" clearance. Just adjust the accelerator arm bolt and nut so it's longer until you have the specified 0.015" clearance.------------------
Ted E.
Fe's are plenty fast, but "Y"'s are fun when they run in the nines.
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capri man
Gearhead Posts: 6417
From: doerun, ga.
Registered: Nov 2000
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posted 05-20-2003 06:42 AM
SCOOP, we forgot to tell you that you had to grow a third hand to do this!!!! one to hold the accelarator wide open, one to push tump lever down and another one to hold the feeler guage!!! if you dont have a stumble or stall when you launch, i would not mess with it.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
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rockafellz
Gearhead Posts: 1426
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 05-20-2003 10:01 AM
Scoop, that stumped the HECK out of me last night!! SteveW told me to adjust the screw so that when the throttle is "tapped" fuel comes out right away. I did this with the car off and throttle plates closed. The screw is just barely resting on the pump lever (not preloaded though). As soon as I tap the throttle, fuel squirts out. I didn't get a chance to start the car last night (too late and avoiding the grumpy neighbor). I will let you know what happens this evening. The Holley book doesn't really explain it how Mike and Ted explained it. Thanks guys!! I guess there's a few ways of doing it.Erik ------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress 1966 Ford Mustang Coupe
Dad's - Original Unrestored [This message has been edited by rockafellz (edited 05-20-2003).] [This message has been edited by rockafellz (edited 05-20-2003).]
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rockafellz
Gearhead Posts: 1426
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 05-20-2003 10:03 AM
double post[This message has been edited by rockafellz (edited 05-20-2003).]
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 05-20-2003 12:46 PM
Do you want the accel,pump to bottom out?
Or is there alittle play left for a reason?Mike your right I should have left it alone.But I never learn do I.I always hope to find alittle more power here or there.The car was running good out of the hole.But if I have more pump shot left why not use it.I think thats right ? Thanks for the help. ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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SteveLaRiviere
Administrator Posts: 43152
From: Saco, Maine
Registered: May 99
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posted 05-20-2003 05:39 PM
quote:
Originally posted by Fastymz:
Do you want the accel,pump to bottom out?
Or is there alittle play left for a reason?
By adjusting it at .015", you are getting the maximum stroke of the accelerator pump, and you have the most volume of fuel for your pump shot.
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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 05-20-2003 07:25 PM
Ok so I'm not the brightes guy around.
Lets make sure I got this right,you want the adusted to .015 open and just touching when it's closed. ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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ted
Journeyman Posts: 62
From: Central Texas
Registered: May 2003
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posted 05-20-2003 10:26 PM
You don't want 0.015" clearance with the throttle plates closed. That will give you a period of time with no pump shot until the pump cam contacts the arm. The arm should be preloaded at idle position against the pump cam and linkages.At full throttle, you want the arm to be 0.015" from being bottomed out. The reason you do it this way is to insure that the diaphragm does not bottom out and bend the arm. Once the arm bends, you'll be hard pressed to get it adjusted right until you bend the arm back. With the throttle wide open, you should be able to push the arm down an additional 0.015". Any more than this, lengthen the adjustment. Any less than this, you're close to being bottomed out if you already aren't at which point you need to shorten the adjustment bolt. At this point a picture would be worth a thousand words but I hope this helps out a little bit more. ------------------
Ted E.
Fe's are plenty fast, but "Y"'s are fun when they run in the nines.
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 05-21-2003 11:36 AM
I got it,it's at .015 now wide open.I love that phrase WIDE OPEN.
And when it's closed the arm is preloaded just alittle,no gap but not really pushing it open either.Thanks to you all for taking the time. ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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