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Holley Accelerator pump tuning #525953 11/14/09 05:13 PM 11/14/09 05:13 PM
Joined: Oct 2003 Posts: 1,371 Costa Mesa, CA C chache876 OP pro stock
chache876 OP pro stock C Joined: Oct 2003 Posts: 1,371 Costa Mesa, CA	I have a holley 650 carb vac. secondaries. I have a bog coming off idle and have read I need to adjust the accelerator pump arm. I'm a little confused on what I actually need to adjust. From my understanding I need a .015 clearance between the accel. pump arm and the linkage on the carb (part with the nuts and spring) @ wide open throttle correct? It doesn't seem to matter how much I loosen that nut at the top of the spring I can not get any feeler gauge in there. The accel pump arm is fully bottomed out at WOT. Am I doing this wrong or what?

Re: Holley Accelerator pump tuning [Re: chache876] #525954 11/14/09 09:59 PM 11/14/09 09:59 PM
Joined: Oct 2003 Posts: 1,371 Costa Mesa, CA C chache876 OP pro stock
chache876 OP pro stock C Joined: Oct 2003 Posts: 1,371 Costa Mesa, CA	bump

Re: Holley Accelerator pump tuning [Re: chache876] #525955 11/14/09 10:03 PM 11/14/09 10:03 PM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: bump You may need to bend the arm slightly. Is it a 30cc pump or 50? Is it possible you have a 30cc pump and a 50cc cam? You can use 30cc cams on a 50 but not the other way around. As for your bog, did you check the float level? Also, is more than .060" of the transfer slot showing (primary or secondary or both). This needs to be sorted out before you change shooters or cams.

Re: Holley Accelerator pump tuning [Re: chache876] #525956 11/14/09 10:12 PM 11/14/09 10:12 PM
Joined: Dec 2007 Posts: 148 Raleigh, NC Y Youngblood member
Youngblood member Y Joined: Dec 2007 Posts: 148 Raleigh, NC	Well, first off, you need to tighten that nut, not loosen it in order to get that .015 clearance. By tightening it, you will shorten it's effective length. You want to get your idle speeds,actually, all base settings, done first. Then loosen the nut so that the pump cam is just touching. You have probably(almost definitely)ruined that pump diaphragm. No big deal to do another one,though

Re: Holley Accelerator pump tuning [Re: chache876] #525957 11/14/09 10:14 PM 11/14/09 10:14 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: I have a holley 650 carb vac. secondaries. I have a bog coming off idle and have read I need to adjust the accelerator pump arm. I'm a little confused on what I actually need to adjust. From my understanding I need a .015 clearance between the accel. pump arm and the linkage on the carb (part with the nuts and spring) @ wide open throttle correct? It doesn't seem to matter how much I loosen that nut at the top of the spring I can not get any feeler gauge in there. The accel pump arm is fully bottomed out at WOT. Am I doing this wrong or what? with the throttle blade wideopened and you pressing the pump lever down.or fully compression..there should be .015 clearance... also...if you move the throttle ...the pump should squirt... Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

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