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Old 08-25-2009, 02:07 PM   #1
temvette72
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Default How to adjust adjustable vacuum advance?

My HEI distributor has an adjustable vacuum advance unit. How does one go about adjusting it? It has a hexagonal shape. Is it adjusted by rotating the housing? Thanks.

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Old 08-25-2009, 02:17 PM   #2
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There is an allen screw inside the vacuum nipple.
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Old 08-25-2009, 07:33 PM   #3
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Thanks a bunch!

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Old 08-25-2009, 08:43 PM   #4
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Quote:
Originally Posted by DWncchs View Post
There is an allen screw inside the vacuum nipple.
OK that's great, but when you turn it, exactly what happens?
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Old 08-25-2009, 08:58 PM   #5
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Quote:
Originally Posted by vetteguy75 View Post
OK that's great, but when you turn it, exactly what happens?
I'm only familiar with the adjustable can I had on a points dist. The allen screw controlled the rate and there was a seperate bracket that controlled the total amount the can could advance the timing.
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Old 08-25-2009, 10:07 PM   #6
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Heres some instructions...

http://69.20.53.62/pdf/210g2.pdf
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Old 08-25-2009, 10:40 PM   #7
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Quote:
Originally Posted by vetteguy75 View Post
OK that's great, but when you turn it, exactly what happens?
tonyv123 s post explains it......PITA big time, I dont care for them.
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Old 08-25-2009, 11:13 PM   #8
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You also need to set the max advance with a limit plate of some sort.
Here is the Crane unit and their instructions.

http://69.20.53.62/pdf/254g.pdf

The easiest way to set the adjustables is using a hand vacuum pump on the cannister to tell you what the vacuum reading is when it opens, and checking with a timing lite.
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Old 08-25-2009, 11:13 PM
 
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