Thomba48 Posted July 16, 2018 Author Report Share Posted July 16, 2018 I did do the reading with to carb to vacuum link being connected. Wrong? Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted July 16, 2018 Report Share Posted July 16, 2018 There is only vacuum in that vac advance line when the throttle is open. At idle the port should be blocked so it wouldn't influence the vacuum reading in the manifold at that time. Also... vacuum is not pressure. It is the total absence of pressure, or negative pressure. Quote Link to comment Share on other sites More sharing options...
Thomba48 Posted July 16, 2018 Author Report Share Posted July 16, 2018 Just now, Merle Coggins said: There is only vacuum in that vac advance line when the throttle is open. At idle the port should be blocked so it wouldn't influence the vacuum reading in the manifold at that time. Also... vacuum is not pressure. It is the total absence of pressure, or negative pressure. Yes you are right ? So is my reading okish? Quote Link to comment Share on other sites More sharing options...
greg g Posted July 16, 2018 Report Share Posted July 16, 2018 https://www.ebay.com/sch/i.html_from=R40&_trksid=m570.l1313&_nkw=1951+plymouth+vacuum+advance&_sacat=10076 Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted July 16, 2018 Report Share Posted July 16, 2018 It's been a while since I've done a vacuum reading on a these engines, so I don't have a good reference. But it didn't seem abnormal to me. Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted July 16, 2018 Report Share Posted July 16, 2018 1 minute ago, greg g said: https://www.ebay.com/sch/i.html_from=R40&_trksid=m570.l1313&_nkw=1951+plymouth+vacuum+advance&_sacat=10076 Before I go after that I'd triple check the part number according to what is required for my distributor number. 1 Quote Link to comment Share on other sites More sharing options...
Thomba48 Posted July 16, 2018 Author Report Share Posted July 16, 2018 1 minute ago, greg g said: https://www.ebay.com/sch/i.html_from=R40&_trksid=m570.l1313&_nkw=1951+plymouth+vacuum+advance&_sacat=10076 51 is Ok for my 49er Quote Link to comment Share on other sites More sharing options...
greg g Posted July 16, 2018 Report Share Posted July 16, 2018 You need to ask the seller which carb numbers it fits. The "IAT, IGS, etc from the side of the distributer body. There some small differences in the advance curves through the years but, l am running a 54 truck dist in my 56 car engine with little ill effect. If he can't answer don't buy. Did you try to adjust the timing to see if you could get a higher reading from intake source? Quote Link to comment Share on other sites More sharing options...
Thomba48 Posted July 16, 2018 Author Report Share Posted July 16, 2018 Hi. No I did not. But will do. Quote Link to comment Share on other sites More sharing options...
Thomba48 Posted July 16, 2018 Author Report Share Posted July 16, 2018 Where do I find the distributor number? Quote Link to comment Share on other sites More sharing options...
Jerry Roberts Posted July 16, 2018 Report Share Posted July 16, 2018 (edited) 5 minutes ago, Thomba48 said: Where do I find the distributor number? On the side of the distributor there will be a metal tag . it might be under that silver paint . I can look up most part numbers to fit Auto -Lite distributors 1938 - 1951 . Edited July 16, 2018 by Jerry Roberts 1 Quote Link to comment Share on other sites More sharing options...
Thomba48 Posted July 16, 2018 Author Report Share Posted July 16, 2018 1 minute ago, Jerry Roberts said: On the side of the distributor there will be a metal tag . it might be under that silver paint . 1 minute ago, Jerry Roberts said: On the side of the distributor there will be a metal tag . it might be under that silver paint . thanks Quote Link to comment Share on other sites More sharing options...
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