1963 AP5 Posted November 20, 2016 Share Posted November 20, 2016 I need to get a new vacuum delay valve for my car and it seems they are a little hard to come by these days. Does anybody know where I might be able to get one of these? The color code on the old one is Brown / Black and I think this means it is a 20 second delay. It looks like this Quote Link to comment Share on other sites More sharing options...
Threeonthetree Posted November 20, 2016 Share Posted November 20, 2016 http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xvacuum+delay+valve.TRS0&_nkw=vacuum+delay+valve&_sacat=0 Quote Link to comment Share on other sites More sharing options...
fuel Posted November 21, 2016 Share Posted November 21, 2016 I know my Magna has/had one for the air injection pipe into the exhaust manifold for the cat converter, but I think the delay is only like 5 seconds judging by the change in tone after first starting. I guess find any 80s/90s carb engine with emissions bullshit and grab one from that. Quote Link to comment Share on other sites More sharing options...
JoKer Posted November 21, 2016 Share Posted November 21, 2016 could you stack them in series to make 4x 5 seconds = 20 second delay? 1 Quote Link to comment Share on other sites More sharing options...
1963 AP5 Posted November 21, 2016 Author Share Posted November 21, 2016 Cool thanks everybody I was hoping to find a local suppler that had new ones but I think scavenging Pick a Part or Zebra for the delay valve might be the way to go. I can see that they are available new in the United States but the shipping would probably cost more than the part. There must still be late 80's / early 90's cars lying around with these things on them. Time for a treasure hunt I think! Quote Link to comment Share on other sites More sharing options...
governorsam Posted November 21, 2016 Share Posted November 21, 2016 Coil up a longer hose going to it? Ling post... Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted November 21, 2016 Share Posted November 21, 2016 man I always wondered what these were. thought they were just like a vac damper type setup 4 Quote Link to comment Share on other sites More sharing options...
1963 AP5 Posted November 22, 2016 Author Share Posted November 22, 2016 Yep that's what they are. They can be used for a few things but in this case the function is to delay the vacuum signal to the distributor vacuum advance unit. If the delay valve is not installed the vac advance unit pulls in too much advance too early causing a little knock under light / moderate throttle application. The valve delays the vacuum signal to the advance unit long enough for the engine to build enough RPM to handle the timing advance (or for you to get off the throttle). My one appears to be blocked or something because I never get any vac advance at all. Quote Link to comment Share on other sites More sharing options...
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