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Quote:

Originally Posted by geeforce (Post 4580555)

I guess my boat is exempt since my exhaust is underwater when stationary. 1.1 Purpose—This document specifies guidelines for stationary sound level measurements for boats with abovewater
exhaust systems.

But if one is running on plane and noise levels are checked --- if you have the exhaust sleeve and are on plane trimmed out a bit running or you have the exhaust bellows as that puts the exhaust under the water at all times for thru the prop exhaust - NON thru hull exhaust.

All Bravo big blocks have the sleeve for the past X amount of years. In the past the lower hp big blocks did not have the exhaust sleeve installed -

Is'nt certain states checking noise levels while running as well ? I do not know cause I do not follow it anymore. Around me they do not perform noise level checks

Quote:

Originally Posted by donzi-joey (Post 3121245)

I have read this more than once and I can not tell how the testing should be done on twin engine boats . Can anyone help with this ?

With twins should both motors be running @ the Time of testing or just one ?

Thanks

Joe

above is the procedure for testing exhaust noise. Each state or commission that makes the laws for the area your boating in can set the noise limit law. So if law states vessel can be no louder than 90 db at idle. If you got one, two or three engines. The vessel gets tested with all running