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Author Topic:   accelerator pump
Jesterondirt
Member
posted April 12, 2004 09:41 PM
What clearance should i run for my accelorator pump, also is it ok install a screw to make the secondaries kick in quicker, I was told that when your running a big cam sometimes you dont pull enough vacuum for the secondaries to open all the way

thanks,

Raz_900
Member
posted April 13, 2004 10:45 PM
The secondaries open when manifold vacuum drops. Forcing a vacuum secondary carb to open the secondaries early is a big mistake. Tune them with a quick change spring kit. There's 7 springs in the kit that'll get you where you need to be. Anything else is just asking for it.



racerman707
Member
posted April 14, 2004 10:08 AM
You can't force secondaries open done tried.The problem is there's no squirters on the sec side and it will kill you.


dirtbuster
Member
posted April 14, 2004 10:28 AM
I am assuming you are talking about a holley carb. For the accelerator pump you dont want any clearance between the pump lever and the pump arm. Adjust the bolt and nut until you just take out all the lash but dont start to depress the pump lever yet.


Earl Parker II
Member
posted April 14, 2004 02:59 PM
One thing to add dirtbusters advice- make sure you have a little extra pump arm travel at WOT. Turn the throttle wide open with one hand and use a finger to push down on the spring end of the pump arm. The other end of the arm should lift off the pump cam at least slightly. The amount of extra travel isn't nearly as critical as making sure you have at least some. If you don't have any, adjust things until you do (this can involve bending the arm if necessary). The pink (330) pump cams are especially problematic in this area.

Without a little extra travel the arm can 'hand up' on top of the pump cam and possibly stick the throttle WO, plus it's conceivable that a pump diaphragm could be ruptured. Either situation is way more excitement than most people need.

------------------
Earl Parker II www.parkercarburetion.com www.holleypartsforsale.com
704.482.7588

[This message has been edited by Earl Parker II (edited April 14, 2004).]

Jesterondirt
Member
posted April 17, 2004 08:08 AM
hey thanks guys, I guess youll never know until you ask.


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