Six pack secondary paper clip test?

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Now that’s a lovely thing to read!

6 barrels of WOT fun!
 
When I rebuilt my carbs last year, the Holley tech told me to use the blue bowl gasket, as the primary reason for vacuum secondary problems is that the older gaskets will fail and allow the vacuum chamber to fill with gas. No vacuum chamber, no vacuum. The gasket was $7 apiece, and I have no alterations on my setup at all. I completely rebuilt everything on all 3 carbs, and it all works flawlessly. When I take off in first gear and nail it, it’s like 2 different motors coming together. The rise is rpm is very noticeable, and the car actually gets a little squirrelly, and the power is 2nd to none.

I rebuilt the vacuum pods in the 2 outboard carbs as well, so maybe a complete rebuild of all components is in your future.
 
Yes Cosgig, this is true.
I am planning on rebuilding them this winter. I already have kits.
The car had been laid up for about a year and a half during a suspension rebuild. So I just wanted to dial it in as best as I could for the time being and have some fun this summer.
Rebuild is for sure happening in the near future.
 
Kllrbee said:
Quick update for Cruze and Mattax. Thanks to all for your help, but especially you 2.
I realize this was almost a month ago, but I went on a 3 week backpacking trip. Just got a chance to tune with new springs.
Turns out it was the springs as suspected. I had the black (heaviest) in there which werent opening at all. Decided to do a go all the way on the other end and try the white (lightest) first. I expected these would be too light and I would get a noticeable bog. But they were perfect, which surprised me. Did the paper clip test on both outboards and they did open. I still had to somewhat mash on it, but I could also feel them open. Although it wasnt as noticeable as I thought it would be. Maybe cuz the transition was relatively smooth with no bog. At any rate, outboards are opening and functioning properly with the white springs. Thanks for the help again.
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Seat of the pants feeling can be deceiving, so the best way to measure improvement is by stop watch over a stretch of roadway. When the springs are right on, you should be able to revv the engine and then feel the engine really start pulling strongly & smoothly. The white springs offer little resistance, so they will come in very quickly. The outboards should only come in when the engine is really starting to pull and needs the additional fuel. Sounds like you are on your way to a really fun time!
 
Kllrbee said:
Quick update for Cruze and Mattax. Thanks to all for your help, but especially you 2.
I realize this was almost a month ago, but I went on a 3 week backpacking trip. Just got a chance to tune with new springs.
Turns out it was the springs as suspected. I had the black (heaviest) in there which werent opening at all. Decided to do a go all the way on the other end and try the white (lightest) first. I expected these would be too light and I would get a noticeable bog. But they were perfect, which surprised me. Did the paper clip test on both outboards and they did open. I still had to somewhat mash on it, but I could also feel them open. Although it wasnt as noticeable as I thought it would be. Maybe cuz the transition was relatively smooth with no bog. At any rate, outboards are opening and functioning properly with the white springs. Thanks for the help again.
Click to expand...

That's how vacuum carburetors are supposed to work. Seamless and unnoticeable. ......except for the haulin *** part. That's just how my little 450 VS on this slant 6 does. You cannot FEEL anything when the secondaries open, but the car really starts MOVING.
 
cosgig said:
When I rebuilt my carbs last year, the Holley tech told me to use the blue bowl gasket, as the primary reason for vacuum secondary problems is that the older gaskets will fail and allow the vacuum chamber to fill with gas. No vacuum chamber, no vacuum. The gasket was $7 apiece, and I have no alterations on my setup at all. I completely rebuilt everything on all 3 carbs, and it all works flawlessly. When I take off in first gear and nail it, it’s like 2 different motors coming together. The rise is rpm is very noticeable, and the car actually gets a little squirrelly, and the power is 2nd to none.

I rebuilt the vacuum pods in the 2 outboard carbs as well, so maybe a complete rebuild of all components is in your future.
Click to expand...

....and you can preach that to all these "single carburetors are better" guys all day long, but until they actually ride in one and feel how one runs that's RIGHT, they'll never listen. A properly tuned six pack will suck a single carburetor down the intake and spit it out the tail pipe and not even burp.
 
RustyRatRod said:
....and you can preach that to all these "single carburetors are better" guys all day long, but until they actually ride in one and feel how one runs that's RIGHT, they'll never listen. A properly tuned six pack will suck a single carburetor down the intake and spit it out the tail pipe and not even burp.
Click to expand...
You're funny, Rob!
 
RustyRatRod said:
....and you can preach that to all these "single carburetors are better" guys all day long, but until they actually ride in one and feel how one runs that's RIGHT, they'll never listen. A properly tuned six pack will suck a single carburetor down the intake and spit it out the tail pipe and not even burp.
Click to expand...

theres nothing like the feeling of an extra 1000 cfm kicking in, it’s not for the faint of heart. I enjoy this car so much because it’s a mechanical beast, pure, raw power. You can’t get that nowadays in those new cars with the cup holders. In a properly tuned 6bbl car, there is no time for beverages, it’s all you can do to keep it tamed!
 
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