[DjD]

I have a vac secondary 780 and got a holley spring kit to adjust the secondaries. The kit comes with 2 springs the paperwork doesn't account for! A white one, and to confuse matters a tall and short no color or plain!

The plain one is the standard acording to the paperwork! Which one is standard (tall or short)? and what is the other one? And where does the white one fit?

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...DjD
Topless'69
rsss.fun@gte.net

[CarlC]

According to Super Tuning and Modifying Holley Carburetors by Dave Emanuel:

Color Relative Load

White Lightest
Yellow Lighter
Yellow Light
Purple Med. light
Plain Med
Brown Med. heavy
Black Heavy

I don't know why two yellows are listed.

Hope this helps.

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To see a picture of my car http://www.geocities.com/casanoc

[DjD]

CarlC,

Thanks for the info! Holley says yellow (short) then yellow so that explains the 2 yellows. Any other input guys? I still have a plain (short) and a plain! Maybe they follow the yellow pattern, but I don't know that for a fact!!!

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...DjD
Topless'69
rsss.fun@gte.net

[davidpozzi]

I have a year 2000 holley parts book that shows:
Color----Load------opening-rpm----full open

White---Lightest
Yellow*--Lighter-------1620------5680
Yellow--Light---------1635------5750
Purple--Med. light----1915------6950
Plain---Med-----------2240------8160
Brown---Med. heavy----2710------8750
Black---Heavy---------2720------not full open

*short spring
This is for a 350 engine. for 406 engine, subtract aprox 10% for each rpm.
That's all they show. You might try holley's web page.
It looks like the short springs might start to open sooner, but reach wide open near the same point as a similar color long spring.

[davidpozzi]

I forgot to mention. Make shure everything is adjusted properly before you start. A little change in float setting will change everything.
And tune the secondary spring with the aircleaner on. Get the spring right for top end 3rd or 4th gear. If you set it for first gear, it will be opening too fast for 4th and you will have a bog in that gear. If you back off on the throttle slightly, and the car pulls better go to a stiffer spring.
If you are getting a bog off the line, especially right at the start, it's probably an accelerator pump or squirter size problem, either adjusted wrong, or too small a squirter. The carb will cough or spit. Ign advance affects this too.

Make shure somebody didn't fool with the linkage and put a screw in the secondary linkage, making it manual secondary.

[DjD]

Thanks Dave!

I put the tall plain in to start and before I even drove it I adj'd the acelerator pump to .015 @wot, adjusted the sec throttle stop, adjusted both floats (sec was too high, and pri too low) and adjusted the mixture (back'd out 3/4 from stumble) and adjusted (.060) the vent valve.

What a difference it all made! Replacing the yellow spring I found in it, explains the way even the slightest push on the gas was like flooring it! Might be ok for racing but tough when leaving a stoplight with a black & white sitting next to you!!! My other post mentioned the off idle stumble it's all gone too... I think the other adj did the trick!!!

I am gonna give it a week and try the purple springs. Thanks again to all!!!


------------------
...DjD
Topless'69
rsss.fun@gte.net

[davidpozzi]

You probably know this stuff allready....

When setting the rear float, it does not consume fuel at idle like the front does.
If you get the float too high, and begin to lower the setting, you are actually pushing the float INTO the fuel, causing it to RISE in the bowl. This can cause an improper setting.
I usually grab the rear linkage and open the rear throttle a little and make shure the secondaries draw a little fuel each time I check.
If you like to go around corners, lower the fuel level to just below the threads.