noisy exhaust, do baffles work.

[ianainge]

Just bought the new boat back from Portsmouth yesterday P360 with TAM63P`s and the exhausts are a big noisy, so thinking of putting some baffles on, i think Vetus do them, anyone know if they work enough to make a significant difference?

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[Wiggo]

There was a thing in MBM a couple of months back about a bloke who made his own stainless ones - just deflected the exhaust down towards the water. Apparently it cuts the noise down, and stops the transom getting covered in soot

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[ianainge]

Graham, yes I read that, he had an older boat with exhaust high off the waterline and on the stern so they were square on as it were, mine are on the side at waterline level and at an angle so not possible, good thought though.

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[simongoldthorpe]

No, his were the same as yours, ie on the side at the waterline. I think it was a P330. I emailed to get some details of what he had done and got a reply offering me the hardware to do it - 2 pieces of flat stainless steel that you fix at an angle above the exhaut outlet. Mine for a mere £200 plus p&p. I think not.

However I think the bloke is onto something. it simply forces the exhaust down into the wake. I am going to get some made up and give it a go.

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[Wiggo]

That's what I thought, though the P360's seem to be angled down anyway. Same arrangement on the Sealine F37 seems quiet enough, though.

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[jfm]

It's hard to describe a noise here but our tamd63p exhausts were noisy too. On a phantom 42. At speed on the flybridge you could hear a deep wooooooor noise from them, and if the revs were slightly out of synch the noise would pulsate/throb a bit. We had those fibregalss dustbin shaped silencer things in the aft corners of the engine room, but never tried to do any mods to reduce this noise

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[ianainge]

thats exactly the sound, didnt really notice cause im used to loads of noise from the Targa 31 but my mate pointed it out he had the same on his Corvette when he re-engined it with 2x 300 hp Yanmars stuck baffles on it and sorted the problem.

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[jfm]

The noise patterns on targatypes versus flybridge boats are very different. On a targatype, you can hear the engines because there's only a bit of floor between you and them. On a shaft drive flybridge boat the engines are usually very quiet (on the flybr, not in the saloon) because you are one deck removed as it were, especially if you close the lid/hatch at the top of the flybr stairs, and so what you hear is usually just exhaust. On our last boat you could definitely hear lots of exhaust and virtually no engine, and our new boat happens to have very quiet exhausts so is near silent on the flybridge, whereas the diesel knock of the engines can be heard in the saloon.

What is hard to establish here on the forum is whether yours are louder than they should be......?

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[tcm]

well, i see no reason at all why we can't replicate the imaginary feeling of the noise. For example, i reckon they are too loud if everyone is muted, and if you can't have a normal level conversatin, and if you can't shout to people to attract their attention. That's more or a WOOOOOOOR and if they are out of synch then its WOOOR-URR-URR-URR-URR faster and faster until they are in synch.

Baffles will certainly cut down on the noise. Um, but there are also speshul exhaust for underwater BUT that will increaed backpressure so can't have them really unless special design from Halyard or similar with an escape for low revs/exhaust pressure.

Mind you, lagging the engineroom will also help loads and loads. Classic acoustics sell foam lagging, with an interlayer, get the stuff made self adhesive and slap it on. Extra layers is good too. Raggie "talbot" came on our boat last week and asked if you could hear the engine when it was turned on. Um, well, yes, a bit, even with the lagging matey. Then he disappeared in a cloud of smoke with engines not started for 5 months.

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[Deleted User YDKXO]

My guess is you will already have a rubber exhaust silencer in each exhaust pipe so first thing to check is whether the baffles inside the silencers have collapsed or not. Even if in good condition, these are not so effective
Then go and talk to Halyard about fitting a water trap type silencer which is much more effective but take up a lot of space, cost a lot and may require an increase in exhaust pipe diameter
Went thru this with my old Broom and decided that the noise was'nt so bad after all

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