[FC] Vacuum advance issue -

[Mikeamauro at aol.com]

"...Then when I hook up the vacuum advance line from the carb, I  
immediately get at least 10 degrees of advance at idle..."
 
Sounds like you not connected to the ported vacuum... you should  be (this 
connection at carb has no vacuum signal at idle), or the idle  adjustment is 
set too high (simulating an off-idle condition, and thus vacuum is  present 
at ported, port).
 
Mike Mauro 
 
 
In a message dated 8/29/2012 1:11:16 P.M. Eastern Daylight Time,  
jeffbrylow at gmail.com writes:

Folks -  First issue - I've been attempting to dial in the engine in my  '64
Greenbrier for some time now and have an issue that has me stumped.  Quite
simply the vacuum advance seems to be performing too well! I'm  experiencing
hesitation on take off and I believe excess spark advance may  be the issue.

With the vacuum line disconnected, as is called for  during the normal
timing procedure, I can time the engine, vehicle in  drive, right at 13
btdc.  Then when I hook up the vacuum advance line  from the carb, I
immediately get at least 10 degrees of advance at idle.  I've tried  three
different advance units all with the same  results.

Some facts to help with any offers of help   -

Engine  code- "ZB"  '61 - '62  80 hp

carb codes  - left bank 7020101 / right bank 7019110

distributor - # 1110272 /  vacuum advance #951

head # 3786588.

Second issue (related to  first issue?)  - I'm only seeing 5-7 in. hg at the
carbs with my  vaccum gauge and the truck actually seems to run quite well
here. This is  with the curb idle set at 1-1/2 turns in per factory setting.
Many sources  state we should see 14-18 in hg.
.
Third  issue (question) - I ran  a compression test recently - results  as
follows - #1 - 140# , #2-  145# , #3 - 142# , #4 - 141# , #5 - 157# , #6 -
140#. These numbers seem a  bit high to me. Are these numbers normal for a
80 hp.  engine?

Thanks,

Jeff B. - Wisconsin

'64 Monza  sedan

'64 Greenbrier

'62 Greenbrier Deluxe (running parts  car)
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