How about the TCC vacuum switch from an early 80s GM Van or Truck? They close at around 6-8 in/hg and release between 2-4. GM made them in several different part numbers, based on engine size, vehicle, transmission, and gear ratio. The numbers quoted are from the originol switch on a 1983 G20, 305 4-bbl, 700r4, and 3.08 gears.<BR><BR><B><I>bcroe@juno.com</I></B> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Dustin Lof, <BR><BR>I don't know if you found it, but I am looking for an <BR>economical vacuum switch. Close circuit at about <BR>6-7 inches abd open circuit about 4" would be good, <BR>adjustable better. <BR><BR>thanks, <BR>Bruce Roe<BR><BR><BR>1 Mar 2006 Dustin Lof <BUBBLESJRTWO@YAHOO.COM>writes:<BR>> I can look through my stuff and find you a part number<BR>> for an adjustable vacuum operated switch, lock-up when<BR>> vacuum is high, unlock when vacuum is low. I also
use<BR>> a vacuum delay valve, it smooths out vacuum<BR>> transitions so when you stab and release the throttle<BR>> quick it wont unlock and lock back up, it has a second<BR>> or two of delay, those two parts with a little fine<BR>> tuning make lockup seem "natural", one other thing I<BR>> do is use a thermal swith inside the trans so it wont<BR>> lock-up when the fluid is cold, you could use a<BR>> thermal vacuum switch but the electric version looks<BR>> better. I will post the part numbers when I get a<BR>> chance to look for them. Dustin Lof<BR>_______________________________________________<BR>Gmecm mailing list<BR>Gmecm@diy-efi.org<BR>http://lists.diy-efi.org/mailman/listinfo/gmecm<BR></BLOCKQUOTE><BR><p>
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