<VV> 390 Holley Carb
Sethracer at aol.com
Sethracer at aol.com
Tue Oct 11 11:25:04 EDT 2005
In a message dated 10/11/2005 8:17:31 AM Pacific Daylight Time,
rsampson at swbell.net writes:
All:
I need to lower the vacuum at which the secondaries open .
Anyone know how to ? I'd like to try to increase my gas mileage.....
Thanks
Rodney
The secondary action is controlled by vacuum overcoming the spring in the
diaphram. Holley sells kits with various strength springs to "allow" the opening
of the secondary. I thinks a kit contains 5 or 6 different strengths - they
are color coded, as I recall.
Acccording to Holley:
The opening rate of a vacuum secondary system is controlled by the diaphragm
spring located in the vacuum secondary diaphragm housing. A “lighter”
spring will allow the secondary throttle plates to open more quickly. A spring
assortment kit, Holley P/N 20-13, is available to help you “tailor” the
secondary opening rate to your application. A “quick change” kit, Holley P/N 20-59,
is also available for fast and easy access to the spring. It consists of a
two-piece secondary diaphragm housing cover which, after it’s installed, can
easily cut in half the time required to change the secondary spring.
Check _www.summitracing.com_ (http://www.summitracing.com) for easy
pricing. - Seth Emerson
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