vacuum testing

[coolcoupe]

To hook up a vacuum gauge, do I use the vacuum line that feeds the wiper and disturbutor that connects to the base of the carb ?

[Brian]

Yes, use the feed to the wipers

[coolcoupe]

So I plug it right into the carb ?

[coolcoupe]

What I meant to say was I plug it into the base of the carb without the other two connected.

[Ronnieroadster]

Originally Posted by coolcoupe

What I meant to say was I plug it into the base of the carb without the other two connected.

You can leave both connected or just take a reading without them connected.
Using the base of the carb for the reading is the best location your reading will be highest at that point.

[coolcoupe]

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Thanks Guys

[Drbrown]

This may be slipping by .... but leave the metal tube distributor line connected to the carb base .... its usually soldered pending year/model set up. As Brian noted, just disconnect the rubber hose from the wiper connection.

Photo shows my '47 set-up. Distributor and wiper connections in lower-right center.

[Brian]

Sorry, been out all day in my 35. The reason I use the wiper line is so that the distributor is still plumbed in. That'll give you a more accurate picture of what's going on.

[coolcoupe]

Thanks Guys, I had not been to garage yet so will try that then.

[Drbrown]

If you haven't discovered this .... here's two good resources for understanding vacuum gauge readings.

http://www.secondchancegarage.com/public/186.cfm

Flathead Vacuum Question (https://www.fordbarn.com/forum/showthread.php?t=149754)

[coolcoupe]

Thanks Drbrown

[russcc]

That tutorial on vacuum readings was excellent. Now to find a good old working gauge.

[Drbrown]

I got my vac gauge at AdvancedAuto several years ago and it seems to work fine. However, I've not had a serious problems since that purchase.