whistling exhaust

[ChrisPy]

I am partially deaf and have been trying to track down what I thought was an engine alarm whistle that occurs between 1100 and 1500rpm on my Isuzu 55 fitted with a hospital silencer (Liverpool Boat Company).

Finally discovered it isn't an alarm, it's a whistling exhaust.

Anyone had a similar problem? Solutions?

[XAlan W]

I am partially deaf and have been trying to track down what I thought was an engine alarm whistle that occurs between 1100 and 1500rpm on my Isuzu 55 fitted with a hospital silencer (Liverpool Boat Company).

Finally discovered it isn't an alarm, it's a whistling exhaust.

Anyone had a similar problem? Solutions?

 

Is your exhaust lagged? A friends boat had a similar problem & he found a leak at the joint[ between pipe & silencer] & at certain revs the exhaust blowing through the lagging was making a whistling noise

[ChrisPy]

I don't think that is the issue. The whistle is definitely heard loudest at the outlet skin fitting and can be negated by partly covering it.

[Timleech]

I don't think that is the issue. The whistle is definitely heard loudest at the outlet skin fitting and can be negated by partly covering it.

 

Maybe a rough edge inside the pipe, perhaps where it joins to the skin fitting?

 

Tim

[bizzard]

It might be the twin turbo-chargers. bizzard.

[ChrisPy]

It might be the twin turbo-chargers. bizzard.

........... hmmm !

 

Maybe a rough edge inside the pipe, perhaps where it joins to the skin fitting?

 

Tim

thanks, I'll check that.