[shovelrick]

I was asking about prog. linkage in another thread but thought I should start this instead of messing up the other thread, so does this AED 1000 look like it has progressive linkage? These are the best pics I could get without removing throttle linkage but if I need to remove it no problem

 

[Calculated Risk]

open the throttle, watch the linkage move.


it's just the little link between the primary arm and secondary arm that makes it one or the other.

 

[nashville beth]

Doesn't look like it to me. Shouldn't there be different places to attach the secondary linkage to ?
The idea is to adjust the opening of the secondaries earlier or later.
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[dyno jonn]

For it to be a true 1:1, it would just be a hole in the rear arm. It isn't. It's a slot.

 

[hydro462]

Looks like its one to one to me..

If you have to slow the secondary's down, just remove the vacuum hose and crimp the tubing down a little more until the stumbling stops. If its not stumbling and pulling out real hard. Keep opening the the tubing up to make the secondary's come on faster..

 

[427L88]

SO I did what Rick said .....and to Rick#2, sir I do believe we both have a simple 1:1 linkage. I mean mine opens at some % primary opening not 1:1 with primary opening, but I was assuming PROGRESSIVE means opens at a quicker rate? .

Mine, anyway, with the same relatively straight linkage between the two, seems like 1:1. CLEARLY not progressive. test yours to see. ( I only did it once slowly as with snow flying , itll be days before the oil can get warmed up)

PS, in pic #2 you see that gap that shows in front of the arm in the secondary throttle, that sets the point of opening. Yours is pretty tight as compared to mine, it appears..

Maybe I am mistaken ,a s the new EFI stuff speaks of progressive as simply not 1:1 but at some % opening. In OLD SKOOL term, I thought it meant the secondaries ramp up quicker in arc than the primary. Height in the throttle arms does this in multi carb setups


Hopefully Chris will chime in and clarify.

 

[bradley67]

Follow post #2 first. That will show you how it is currently setup. Looks to me to be setup as progressive.
If you pull the lever off going to the secondaries and move it to the bottom hole I think it should be 1:1. But I can’t see if there is a bottom hole clearly.

 

[David Ray]

The first picture shows, and proves the secs on that carb are NOT 1:1, but, ARE progressive.

bradley's idea is good to try for 1:1, I've not tried it. Just make sure all 4 throttle plates open together and all the way open (look down the throttle bores in the body, from the top, downward, as you test).

I worked for Holley for 5 years in Pro-Stock carbs, and never even considered doing what bradley suggested, we will all learn from your testing.

 

[nashville beth]

I think Rick's linkage is progressive if I understand what they mean by "progressive."
I think it means that the primaries open before the secondaries.
This 4150 linkage ia adjustable to varying degrees of "progressive."

Linkage Kit (4150) super progressive

... - allows primary throttle shaft to open 60% before engaging secondaries.

 

[pockets]

Your linkage is progressive, which means the primary and secondary do NOT open at the same time and rate from idle. The primary opens first, then the secondary starts to open once the primary reaches a certain point. Making them 1:1, which the 1:1 needs to be adjusted exactly so that both start to open and reach full open at the same time, will make the throttle more "touchy" to throttle movement, and also make the power seem be stronger.

 

[shovelrick]

I'll test it this weekend, last time I drove the car (over a month ago) it seemed like I wasn't getting WOT, I'm using a drop base air cleaner and haven't seen it hitting anywhere but can't tell when I'm behind the wheel, I'll get another person to watch, I was thinking maybe something with the linkage but I also want what ever's best for a street car

 

[pockets]

View attachment 710010 View attachment 710011 View attachment 710010 View attachment 710011

I'll test it this weekend, last time I drove the car (over a month ago) it seemed like I wasn't getting WOT, I'm using a drop base air cleaner and haven't seen it hitting anywhere but can't tell when I'm behind the wheel, I'll get another person to watch, I was thinking maybe something with the linkage but I also want what ever's best for a street car

Often, the holleys won’t actually achieve full throttle.
Either the secodnary link rod needs to be bent, or the baseplate filed where the throttle bracket contacts at full throttle or both.
Just finished a 950 HP that was way off.

 

[427L88]

Well well, I guess "progressive" doesnt mean what I thought it meant. Delayed isnt progressive in English, but......English wasnt my mother tongue.

 

[65cayne]

I'll test it this weekend, last time I drove the car (over a month ago) it seemed like I wasn't getting WOT, I'm using a drop base air cleaner and haven't seen it hitting anywhere but can't tell when I'm behind the wheel, I'll get another person to watch, I was thinking maybe something with the linkage but I also want what ever's best for a street car

Yours is progressive. Its exactly like my AED. Remove the air cleaner and actuate the linkage by hand.

 

[shovelrick]

I've moved the linkage by hand with the air cleaner off and it's fine, might drive it without the AC on and see how it is, I've only drove the car twice since the 489 install, back from shop where we did the swap (babied it) and one test drive that didn't impress me and felt like no 4 bbl, then some family health problems so the car sat and now I'd like to get some bugs worked out

 

[65cayne]

I've moved the linkage by hand with the air cleaner off and it's fine, might drive it without the AC on and see how it is, I've only drove the car twice since the 489 install, back from shop where we did the swap (babied it) and one test drive that didn't impress me and felt like no 4 bbl, then some family health problems so the car sat and now I'd like to get some bugs worked out

Rick, I really have to get into the gas pedal to actuate my secondaries. And believe me when I say you will feel them open up. Have someone depress the accelerator while you watch the throttle plates to be sure they are opening. Then re-install the air cleaner and repeat ensuring that the linkage is not binding somewhere.

Not sure if you mentioned it since you got it installed and running, do you plan to take it to the track?

 

[shovelrick]

Yes it's going to the local 1/8th mile track, the race engine/dyno shop owner is going to take it down the track first, I guess to tune it? then I'll take it down the track but I haven't scheduled or checked with him lately about it, my wife got sick just before Xmas so I haven't been doing anything but taking her to see Dr's and now that's done for a month or so, I'm going to go with John the engine shop owner to Bradenton speedway 1/4 mi. track to see what it'll do, he said with the 3.73 gears he didn't think it'll 1/8th mile very good, he goes to the 1/8th mi. track monthly I'm not sure about Bradenton, I haven't been down our local track since the late 70's lol

 

[65cayne]

...he said with the 3.73 gears he didn't think it'll 1/8th mile very good...

That's all a matter of perspective. With that mill under your hood, there is a lot of fun to had.

 

[Bob Tiley]

If you don't get 100% primary throttle blades opening you may need to move the stud for your throttle cable to the upper hole in your carbs throttle shaft lever. Also make sure they are not opening more than 90 degrees as this causes throttle shaft / baseplate wear.