N8RV
Well Known Member
While my question relates to the MAP reading on a Dynon D-120 EMS, I put it in the Engines forum because the crux of the question revolves around the manifold pressure line.
A common issue with the MAP reading when drawing manifold pressure from a cylinder is that the digital readout fluctuates wildly because it's so sensitive to the changes in pressure as the intake valve opens and closes rapidly -- or so goes the explanation from Dynon.
The solution is to restrict the airflow in the manifold pressure line by inserting something in the line -- some have used a cigarette filter or dense foam with good results. I chose the cigarette filter route and it worked dandy. Rock solid MAP readout.
Then, it suddenly started fluctuating again. It was time for an oil change anyway, so I pulled the cowling and saw that the cigarette filter was starting to pull apart! The center fibers were being sucked toward the cylinder.
Anybody have a guess as to the consequences of a cigarette filter being sucked into a cylinder?? Will it just be burned in combustion or might something more disastrous be the outcome?
Thoughts?
A common issue with the MAP reading when drawing manifold pressure from a cylinder is that the digital readout fluctuates wildly because it's so sensitive to the changes in pressure as the intake valve opens and closes rapidly -- or so goes the explanation from Dynon.
The solution is to restrict the airflow in the manifold pressure line by inserting something in the line -- some have used a cigarette filter or dense foam with good results. I chose the cigarette filter route and it worked dandy. Rock solid MAP readout.
Then, it suddenly started fluctuating again. It was time for an oil change anyway, so I pulled the cowling and saw that the cigarette filter was starting to pull apart! The center fibers were being sucked toward the cylinder.
Anybody have a guess as to the consequences of a cigarette filter being sucked into a cylinder?? Will it just be burned in combustion or might something more disastrous be the outcome?
Thoughts?