4100 secondary activation

    is the progressive mechanical secondary kit the only way to upgrade? was/is there a spring change to bring them in earlier but still stay vacuum? since I changed the rear gears, the RPM's climb slower, thus it seems like it takes longer for them to open. I think the mechanical kit would be better, but just checking options. any testimonials would be welcome. Bill

    Edited once, last by SixT5HiPo (August 22, 2009 at 11:14 PM).

    My Koupe has had the mechanical conversion since new, works very nice, you can feel the tip in point and control use of them. The only issue (if you want to call it one) is that they come in quite abruptly and can break the tires loose:) Tip in point can be adjusted from about half throttle to about 3/4 throttle.


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    Edited once, last by Mu5tanggt_old (August 18, 2009 at 10:25 AM).

    I'm looking at your picture and reading your older post that showed the install instructions. It seems that the roll pin is what pushes the secondary lever open and the vacuum rod is just along for the ride? What closes the secondaries? Do you have the washers installed? I don't understand what they do, but from the picture in Mustangs Unlimited, the repop they have doesn't show the washers as part of the kit.

    Back in the 70's, we just tied the levers together with some wire, I didn't know about this kit. Was that a $1.50 price stamp?

    Washers are to break vacuum @ diaphram, right now it just has an old diaphram with a small hole drilled in it looks cleaner this way. The spring in the diaphram pushes the secondaries closed. the rod from the diaphram is still connected to the secondary lever and also acts as a pivot point to engage roll pin on secodary lever. Hard to decribe the action without seeing it work, quite ingenious. Yup cost a $1.50 new in 1966.

    Edited once, last by Mu5tanggt_old (August 19, 2009 at 7:37 PM).

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