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29 Jan 2022 17:22 #1 by Matt Gunsch
Replied by Matt Gunsch on topic Low vacuum
you need to look under the panel at the line coming from the venturi, there should be a valve with a adjusting knob, think of it as a calibrated leak, if the venturi pulls more than 5.5 inches, it allows more air into the suction line, lowering the pressure. www.flightliteracy.com/wp-content/uploads/2017/12/5-27.jpg

A&P, IA, PPSEL
too many years GA and Warbird Maint
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27 Jan 2022 21:27 #2 by Philip Vardara
Replied by Philip Vardara on topic Low vacuum
No idea. I’m new to Coupes. Have no idea what one looks like. If I do, where might it be located? Do you have a picture? Or can you describe?  Thank you! 

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27 Jan 2022 18:53 #3 by Matt Gunsch
Replied by Matt Gunsch on topic Low vacuum
does your system have a vacuum regulator ?

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too many years GA and Warbird Maint
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25 Jan 2022 13:20 #4 by Philip Vardara
Low vacuum was created by Philip Vardara
I have a 1946 415D with the external vacuum horn/venturi (ie, no vacuum pump). Engine is a C-90. At full throttle/full speed (90 mph) my vacuum gauge is not in the green. It is only showing 3.4-4 max on the vacuum gauge. "Normal" range is ~ 4.75-5.25.  Any thoughts on my next steps?  Thank you very much! 

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