Let me ask you this? What would cause the engine to vibrate at low rpm on certain props? I'm propped right now but I have a GT 150 on a 17 foot deep v runabout and after finally getting it propped right I was wondering, I tried a 18 pitch turbo prop and at idle threw the no wake zone I'd get a vibration. The 22 pitch raker would do the same, A 19 pitch alum would do the same. But this 19 pitch stainless Michigan is smooth smooth. I was just wondering why this Michigan is so smooth and the others had the vibration. The raker and the turbo has the exhaust holes, The alum was new and didn't. The Michigan seems to have a little bit of a cup, could that be the reason??????
