You can make the secondaries come in with the car standing still. If you have someone push the pedal to the floor, as you are watching, you should see the secondaries move, as well as hear it.

 

On a 4100?
That's news to me. I bypass the goofy vacuum setup with a Eelco mechanical secondary
kit. The stock vacuum provision doesn't make things happen nearly quick enough for me.

 

are you sure you are talking secondaries and Not the kick down for the Transmission. (assuming you have an automatic which is not stated)

 

Picture of the paper clip method....

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Get a 4150 spring assortment kit and put a lighter spring in the secondary!

 

Well they are vacuum controlled and will open only when the engine needs them. Maybe there hasn't been enough load to open them. The other if the secondaries are working correctly and coming in at the right time you won't feel them. When you do feel the secondaries open and a sudden rush of power that means they are opening to late. What you feel is the power dropping off because the secondaries didn't open soon enough.

 

When driving the car I feel no response from the secondaries when pressing the gas pedal to the floor.

You won't. The secondaries are vacuum operated, and will only open when the primaries are all the way open, and the engine ins screaming for more fuel, which happens at roughly 3000 rpm. Other than perhaps a slight twitch in the secondary linkage, you won't see this in your driveway unless you tach it up to piston-blowing rpm.

The tiny brass tube sticking down into the primary venturi operates the secondaries, and these get bent sometimes during rebuild, and do not fully work, delaying or precluding secondary operation, when reassembled. Gently bending them back down to where they should be is the only cure.

Oh, and the paper clip is a lot harder to do on the 4100 than on the Holley 4160.

 

I drove this on my daily for 15 years. Completely mechanical, no vacuum at all. Downside- If you push too hard, open the throttle too far, too fast, it just kills performance.

 

Good Lord David...could you just post some pics of your cars or cars you have owned so we can all view in envy?

 

Well, to be fair, I linked that photo from Brattlands site, to show the mechanical linkage. Here's my Tripower, next to my dual-quad. I snapped it five minutes ago for you. I currently have the OEM 4100 1.12 on my car.

When I'm in the mood for fins, I drive this one. You can see the taillights from the driver's seat.

 

On a shelf with an elf...what an injustice. :grin2: