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04-06-2020, 01:05 PM | #1 |
Junior Member
Join Date: Aug 2018
Location: Kitchener, Ontario, Canada
Posts: 17
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Distributor question
Hi All,
Could somebody tell me what the slotted head screw on top of the distributor does? Car is 1947 ford flathead V8. Thanks in advance. Brian |
04-06-2020, 01:08 PM | #2 |
Senior Member
Join Date: May 2010
Location: Essex Vermont
Posts: 599
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Re: Distributor question
It adjust the drag or brake for vacuum advance. Others will chime in with a better description . Ken
Last edited by Ken Arms; 04-06-2020 at 01:15 PM. |
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04-06-2020, 05:54 PM | #3 |
Senior Member
Join Date: Aug 2010
Location: McMinnville, TN
Posts: 2,327
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Re: Distributor question
As Ken states, it is the vacuum brake adjuster (not advance).. In my opinion with today's fuels and assuming your advance weights are working properly you will have the best performance by backing it all the way out. Ford created that to retard the timing on a low vacuum condition such as towing or climbing a steep hill to prevent spark knock. The fuel octane levels these days are that of such that that would be of no concern. VERY slight tension on the piston plunger can help return the advance weights to static if they are sticking slightly and that is the only benefit of turning it in these days.
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04-06-2020, 05:56 PM | #4 |
Senior Member
Join Date: Dec 2014
Location: Santa Maria, CA
Posts: 985
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Re: Distributor question
Thanks, 35fordtn, for that suggestion!
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Alan 1929 Special Coupe 1941 Pick-Up 1955 Victoria |
04-08-2020, 04:03 PM | #5 |
Senior Member
Join Date: May 2010
Location: middle of Iowa
Posts: 646
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Re: Distributor question
Give your car a test drive about 25 MPH in second gear, then stomp on it. If you don't hear a ping, you can probably adjust the screw out a half turn. Give it another try, then again, until you get some ping. Then give it a half turn inward and try for ping again. If none, lock down the nut and you are good.
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04-08-2020, 04:15 PM | #6 |
Senior Member
Join Date: Apr 2018
Location: Chelmsford, ON Canada
Posts: 528
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Re: Distributor question
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Brian http://www.bubbasignition.com/ |
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