DeTomaso Mailing List: June 98, Message #432

     I replaced my vacuum advance mechanism about a year ago, or was it 
two years ago.  Anyway, I think that turning it clockwise made the 
spring stiffer and "minimized" the advance.  My old vacuum unit 
(duraspark II) had an "8" stamped on the back and appeared to give about 
8 degrees of advance at full (22 in) vacuum.  The chief auto replacement 
canister for a Ford truck had a "12" stamped on the back and appeared to 
give about 12 degrees of total advance at full vacuum. (on both the 
travel was limited by a tang on the actuation arm)
     Does it make a significant difference?  Maybe in your mileage (if 
it wasn't working or set too stiff) or it could contribute to a pinging 
problem if it was set too loose.
     How SHOULD it be set? I defer.  I think to answer that you'd have 
to talk about initial, cetrifugal, vaccuum and total advance.  Can any 
one help with that?

Brent 
4130

>Reply-To: "Cristiano Rossi" <rossi@image.dk>
>From:	"Cristiano Rossi" <rossi@image.dk>
>To:	Multiple recipients of list <detomaso@realbig.com>
>Subject: Vacuum advance regulation
>Date:	Thu, 11 Jun 1998 11:40:49 +0000
>
>Which way do you have to turn the screw in the vacuum diaphragm 
assembly on
>the distributor to _minimize_ the vacuum advance - clockwise (right) or
>counterclockwise (left)?
>
>Does this regulation make a significant difference?
>
>How should it be adjusted? Do you have to minimize the vacuum advance 
and
>then give it more and more vacuum until the engine begins to ping?
>
>Thank you,
>
>Cristiano Rossi
>thpnma 02869
>
>


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