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Author
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Topic: Holley Accel.Pump Cam...?
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 09-23-2004 11:18 AM
   
I think all Holley carb accelerator pump cams come with more than one mounting hole. And, typically, there are two mounting positions on the carb linkage. Does Holley intend for the #1 cam hole to go into the #1 linkage mounting hole, or can we mix them up; say, using #1 cam hole in the #2 linkage mounting hole? What is gained/lost by moving the cam mounting around? Thanks!
Ryan 
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-23-2004 11:56 AM
Each cam is different and acts different in different holes. What I like to do is remove the carb and dump the fuel, then turn the carb over and actually watch the the movement of the pump lever with different spring adjustments and cam settings. If you move away from #1 hole you usually end up readjusting the lever spring for a stronger/quicker shot that doesn't last as long. It's the best way to understand what the different cams and settings are doing. Then go from there and select a cam stting for what you "think" the engine wants.I've even taken old cams and reground them on a small grinding wheel to try and get the desired pump shot.  ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 09-23-2004 12:07 PM
Dan,
Thanks for the reply & advice!  I guess I'll play around with it some and see if I can find the sweet spot! Ryan
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-23-2004 12:09 PM
One thing I forgot to mention is, you want the lever to move instantly with the acclerator but NOT push the diaphragm past it's intended range at WOT. You could damage the diaphagm or bend something. That's why it's good to take the carb off and observe everything closely as you make any changes.
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 09-23-2004 01:11 PM
That makes sense.... I think I'll write down my changes as I go so I can track "what I did" and "what worked best". Thanks again, Dan! Ryan
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JCQuinn@work
Gearhead Posts: 826
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 09-23-2004 04:29 PM
Ryan, Holley makes a kit that contains several pump cams with different profiles. It should help in fine tuning.John
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 09-24-2004 07:12 AM
Thanks for the input, John! Yep, last night I was at their site, www.holley.com & saw the kit that you mentioned....later today I'll give my local parts house a call for price/availability. Thanks again!
Ryan ------------------
'69 Mach I; 306"; 4-spd; drag racer.
'65 F100 Short box; 390"; 4-spd; Tow Truck.
'85 GT Convert.; last carb'd 5.0L; 5-spd; street cruiser.
'94 Ranger; commuter/parts hauler.
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