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#1 |
Senior Member
Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,497
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What to hook vacuum guage up to?
I was just reading franko72's thread on vacuum guages. Does it matter which line it is hooked up to?
Shawn
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Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs. |
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#2 |
Account Suspended
Join Date: Sep 2000
Posts: 4,002
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I hooked mine up to a port on the carb, you might have to get a "T" fitting so you can add an extra line.
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#3 |
Registered User
Join Date: May 2004
Posts: 4
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If you put it on a carb fitting, make very sure that it is an actual manifold pressure tap, not a "ported" one that changes signal when the throttle blades open.
Ported ones like you hook the vac advance line to will give you false vac readings. Best place is a fitting directly on the intake manifold, no chance of errors with that. Vac guages are kind of cool. They are often sold as "Economy" guages, or some such, because they can help you learn to drive with a right foot that can get the best mpg out of your engine. Every time you put your foot in the carb, the guage will drop way down. If you practice accellerating while keeping the guage as high as possible, you will see an improvement in your mileage. If you have a lead foot, it could be a big improvement. It will make you a smoother, more consistant driver if you practice. Of course, every now and then you have to ignore the guage and stomp it. ;-) Dave Horn 72 K20 CustomDeluxe, original but now hot 350, TH350, NP205, 4.10 lockers 72 Custom/10, hot MercruiserMarine 305 67 CST, Vette 327, CR4spd, factory buckets 88 Cherokee 4.0 (wife's "car") |
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#4 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,283
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In my application, L6 292, Clifford headers, Offy intake, Holley 390 cfm-- I used the threaded port on the side of the Offy intake. It reads the state of flow inside the runners, and doesn't interfere with the carb operation.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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