Resonating while underway

Chrisvr6

Member
Sep 6, 2016
192
Chicago
Boat Info
2002 280da
Engines
Twin 5.0mpi
I sea trialed a 2002 searay 280 sundancer the other day and it seemed like there was some resonating through the whole boat while underway at some rpms, not all though. Thought that was only on vdrive boats. This one had 5.0s and b3s.
 
Maybe the exhaust bellows are old and vibrating under pressure. Had this issue on my 496. Ran with hatch open and saw the old pipes shake like crazy. New pipes all good.
 
I suspect that whoever was running the boat had the engines slightly out of sync. Correct by slightly advancing or retarding one engines throttle setting to see if the oscillation gets worse or better. All twin engine boats will oscillate if the engines are out of sync but running at nearly the same rpm.
 
This could just be a shot in the dark but while I am underway, the straps that pull the bimini tight on the front windshield will resonate depending on how tight they are. It took me a couple times out to figure out what it was.
 

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