Re: Vacuum Relief Valve Adjustment
Posted: Mon Jul 31, 2017 2:31 am
My vacuum system has the same figures that Bruce got but my Bat and ball instrument only runs on [needs] 1.5 ins of vacuum. So it has its own small 4 inch Venturi. I haven't put in a relief valve yet as everything works well. Venturi,s do not wear out or shalf,s shear , and are also not affected if the prop is turned backwards etc. we removed the venturies off a early cessna 172 recently and fitted a Garmin G5. The difference in speed per RPM and fuel flow ,"NONE".