I have a MP gage that is acting "funny" (aviation technical term). It is on an RV-6A, O-320E2D. 150hp, carburetor, fixed pitch prop. Yea, I know you don't need MP on a FP prop, but it came with the airplane when I bought it.
On the ground, the MP gage seems to be correct, showing low (12") at idle or near idle, and 28" or so at full throttle, which would be about right for the DA of around 2500' or so.
BUT, when airborne, at say 7500 feet, WOT, 2650 RPM and indicating around 170 kts or so, the MP reads about 28.5". I can't imagine that the ram effect through the FAB would be that much.
Seems to be reading way too high.
Any thoughts, ideas, or experiences?![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![Eek! :eek: :eek:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
PS: The gage is hooked up to the #2 cylinder primer port.
On the ground, the MP gage seems to be correct, showing low (12") at idle or near idle, and 28" or so at full throttle, which would be about right for the DA of around 2500' or so.
BUT, when airborne, at say 7500 feet, WOT, 2650 RPM and indicating around 170 kts or so, the MP reads about 28.5". I can't imagine that the ram effect through the FAB would be that much.
Seems to be reading way too high.
Any thoughts, ideas, or experiences?
PS: The gage is hooked up to the #2 cylinder primer port.