BJohnson
Well Known Member
What would cause a momentary loss of power at 85% power about 5 minutes after takeoff on a IO 320 using a Silverhawk fuel injection system? I was step climbing to clear Class B floors around Seattle and added power, full rich and started to climb with boost pump off. About 40 seconds later the engine lost about 200 rpm, then recovered over a 10 second period. During the same event fuel flow dropped from 13.4 to 11.6 gal/hr, fuel pressure dipped slightly from 25 to 24 psi, three EGT?s rose about 12 degrees, and one EGT dropped 54 degrees. I had just refueled and sumped the tanks. A few weeks prior I had a smaller but similar event that occurred just after refueling while a level on downwind departure with a 50 RPM drop but this time 3 EGT?s stayed the same and one EGT dropped 20 degrees, a different cylinder from the other event.
I pulled the cowling and checked for loose fuel connections, ignition wiring, or signs of any loose injectors, throttle body, intake manifold. Everything looked fine. Subsequent flights have not repeated the same issue (on the same tank of gas).
Could this be a water ingestion issue? Or what else could cause a transient low of RPM?
I pulled the cowling and checked for loose fuel connections, ignition wiring, or signs of any loose injectors, throttle body, intake manifold. Everything looked fine. Subsequent flights have not repeated the same issue (on the same tank of gas).
Could this be a water ingestion issue? Or what else could cause a transient low of RPM?