2 barrel carb vs 4....

[Excaliber]

I recall the old Quadrajet (mostly on GM stuff). With the small primaries and very large secondaries you could FEEL and HEAR those secondaries coming into play.

But, generally speaking and specifically speaking of Holleys you should not be able to feel or hear it very much or at all. It should be a smooth transition, if you can feel it, your secondary spring is likely to light weight. Thus the need for a paper clip test.

[azfordman]

That's it exactly. I have also used a zip tie in place of the paper clip, just tight enough to stay in place, but loose enough to slide up and down. If running correctly there should be no feeling the secondaries kicking in with the Holley, like the power boost I used to get at higher RPM's. I have yet to make any controlled runs to see exactly where they are kicking in, but I do now have a lot more power at lower RPM's than before. This is just one of those little things I had never thought of checking.....nothing worse than giving up free power!!!

[azfordman]

Originally Posted by Excaliber

I recall the old Quadrajet (mostly on GM stuff). With the small primaries and very large secondaries you could FEEL and HEAR those secondaries coming into play.

But, generally speaking and specifically speaking of Holleys you should not be able to feel or hear it very much or at all. It should be a smooth transition, if you can feel it, your secondary spring is likely to light weight. Thus the need for a paper clip test.

Not to correct you....but from what I understand, if you can feel the secondaries kick in, as in a boost of power, the spring is too strong and the secondaries are kicking too late. If the spring is too light and the secondaries kick in too soon, there will be a bog in the acceleration. After I replaced the vacuum diaphragm I put in the long yellow spring, the 3rd lightest. I will try the short yellow spring today. I think the lightest spring in the kit, the white one, may be too light, but I will see.