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Woodsy · 08-08-2005, 01:04 PM

Yes the MP's know what a switchable exhaust looks like. I have had them crawl thru the engine compartment looking for them. My old Donzi 18 Classic had muffled exhaust tips (no switchable) and it passed the db test... When I purchased my 22 Classic, it didn't have thru hulls at all, you should have seen the looks I got with that boat... screaming yellow paint and no noise. I am looking at a 26ZX Donzi that does have the muffled exhaust tips and the switchable exhaust (its a used boat), and I will disconnect it as the law requires. It too will pass the db test. Here is a link to the Corsa Performance website. http://www.corsaperf.com/marine.htm There are more than a few different ways to quiet down boats.

The problem is that measuring sound accurately is very difficult. Look at the hoops they jumped thru on motorcycles, and somehow they got a 106db limit! YIKES! Thats pretty darn loud.

My solution would be to require all boats with thru hull exhaust to have mufflers. Keep the same db max and allow switchable exhausts. There can be some exceptions to the rule, as alot of the classic older wooden boats did not have mufflers. But essentially, if its fiberglass it should be muffled somewhat. There are enough muffler choices out there!

Woodsy

Now, if the Marine Patrol were funded better, they could convert one of bigger buildings into a sound lab for accurately testing noise emissions.

08-08-2005, 01:04 PM	#18
Woodsy Senior Member Join Date: May 2004 Location: Weirs Beach Posts: 1,974 Thanks: 80 Thanked 984 Times in 443 Posts	Yes the MP's know what a switchable exhaust looks like. I have had them crawl thru the engine compartment looking for them. My old Donzi 18 Classic had muffled exhaust tips (no switchable) and it passed the db test... When I purchased my 22 Classic, it didn't have thru hulls at all, you should have seen the looks I got with that boat... screaming yellow paint and no noise. I am looking at a 26ZX Donzi that does have the muffled exhaust tips and the switchable exhaust (its a used boat), and I will disconnect it as the law requires. It too will pass the db test. Here is a link to the Corsa Performance website. http://www.corsaperf.com/marine.htm There are more than a few different ways to quiet down boats. The problem is that measuring sound accurately is very difficult. Look at the hoops they jumped thru on motorcycles, and somehow they got a 106db limit! YIKES! Thats pretty darn loud. My solution would be to require all boats with thru hull exhaust to have mufflers. Keep the same db max and allow switchable exhausts. There can be some exceptions to the rule, as alot of the classic older wooden boats did not have mufflers. But essentially, if its fiberglass it should be muffled somewhat. There are enough muffler choices out there! Woodsy Now, if the Marine Patrol were funded better, they could convert one of bigger buildings into a sound lab for accurately testing noise emissions.