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Original Message

2X4 Vacuum Secondary Adjustment

By John - 05/28/2006 10:19:44 PM; IP 142.177.97.107

Yes, you may laugh or be scornful, or whatever, but until recently I never realized the vacuum secondaries wern't opening on my 428. I just finished doing a shift from 2 to 3rd (going up a steep grade), and was getting into the throttle a bit more than normal, when they did open. Felt like I was hit in the back with a sledgehammer. Very impressive...... very noisy.... very scarey...LOL. So I was thinking I ought to change the diaphram springs to have the secondaries open earlier.....so I can anticipate it better and have it happen during a more controllable power output. The car weighs only 2550 lbs, so I would think this change would be appropriate. I have two Holley spring kits. There are a variety of differnt coloured springs in them....colours indicating light to hard spring rate. Does anybody have any thoughts on this matter?

Also, is it best to work through springs from stock to light, or start at the lightest spring, and work back up? I was going to go straight to the lightest spring, and if they open too early and the engine bogs, then work up.

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Collapse <b>2X4 Vacuum Secondary Adjustment</b> -- <font color=#0000ff>John, <i>05/28/2006</i></font>

2X4 Vacuum Secondary Adjustment -- John, 05/28/2006

Collapse <a href=../ForumFE/reply.aspx?ID=27455&Reply=27449><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor27455" onclick="return false;">RE: 2X4 Vacuum Secondary Adjustment</a> -- <font color=#0000ff>Gerry Proctor, <i>05/30/2006</i></font><script type="text/javascript">
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RE: 2X4 Vacuum Secondary Adjustment -- Gerry Proctor, 05/30/2006

Collapse <a href=../ForumFE/reply.aspx?ID=27456&Reply=27449><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor27456" onclick="return false;">RE: 2X4 Vacuum Secondary Adjustment</a> -- <font color=#0000ff>John, <i>05/30/2006</i></font><script type="text/javascript">
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RE: 2X4 Vacuum Secondary Adjustment -- John, 05/30/2006

Collapse <a href=../ForumFE/reply.aspx?ID=27464&Reply=27449><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor27464" onclick="return false;">RE: 2X4 Vacuum Secondary Adjustment</a> -- <font color=#0000ff>walt, <i>05/30/2006</i></font><script type="text/javascript">
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RE: 2X4 Vacuum Secondary Adjustment -- walt, 05/30/2006

Collapse <a href=../ForumFE/reply.aspx?ID=27478&Reply=27449><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor27478" onclick="return false;">TY guys, and a note for one-handed Walt</a> -- <font color=#0000ff>John, <i>05/31/2006</i></font><script type="text/javascript">
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TY guys, and a note for one-handed Walt -- John, 05/31/2006

RE: TY guys, and a note for one-handed Walt -- walt, 06/03/2006