Yellowbird911
Member
- Messages
- 34
- Reaction score
- 18
- Points
- 17
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
- Boat Length
- 21
First time out a few weeks ago with our new to us 07 SX210 I didn't know what to expect with the threads I had read about noise. The factory sound mat had degraded so I was expecting a little more noise. When I first went to full throttle I felt like I had made a huge mistake selling our trusty Chaparral 1830SS with a 4.3 MC I/O. The sound especially with the degraded factory mat was ungodly awful. Couldn't hear the radio without blasting it, forget talking at cruise without yelling. Absolutely unacceptable but....thanks to all the previous threads on sound deadening and a fair amount of work last weekend on the boat was way more tolerable. Now the radio can be heard, conversion at cruise is possible. Before you could not hear water noise at all just the screaming engines and now water noise from hull spray is about the same volume while at cruise which is around 30mph and 6500rpm. Didn't really go step by step to see what each improvement made, more of a shotgun approach as I did not want to take it out again unless there was a large improvement.
What I have done so far:
1. Added a soft foam seal to the engine hatch, quite possibly the easiest and cheapest with the biggest reward.
2. Removed old factory seat back mat and replaced with 2 layers of 10mm sound mat with the aluminum foil face. Also added 6 acustic squares to back of engine cover.
3. Filled the gas tank hold with foam from old camper cushions.
4. Covered any surface in the muffler box that had a tinny sound when knocked on with a butyl mat and then a layer of 10mm sound mat with foil face. Then added a few acustic squares.
5. Covered inside fiberglass of seat areas that face the inward with butyl mat and 10mm sound mat.
6. Added foam floor covering from SBT.
Things I still plan to do.
1. Fill aft under seat storage areas with large foam blocks when I figure out where to source them. The kind used at kid parks.
2. Feel like that though the sound mat will keep noise from coming though a panel the aluminium foil side does nothing to attenuate the sound waves in the engine bay. Once I source the right foam egg crate type material I plan to cover all walls in the engine bay with it. I added acustic squares but really think all walls should be covered.
3. Feel like a lot of sound comes from the swim deck as mentioned in other threads. The aft end of the swim deck is a large cavity and when you rap your knuckles on the aft top deck it resonates all through the muffler box. Other than the hold down loops on the transom there is nothing else in there. Why not fill that area with expandable foam? If god forbid you had to get to the hold down bolts you could always carve out the foam. Any options?
At this point I don't really sense sound coming from the forward hull but will not rule it out either. Even at the current level the boat is much more enjoyable, most importantly wife and kids don't notice a noise issue anymore.
What I have done so far:
1. Added a soft foam seal to the engine hatch, quite possibly the easiest and cheapest with the biggest reward.
2. Removed old factory seat back mat and replaced with 2 layers of 10mm sound mat with the aluminum foil face. Also added 6 acustic squares to back of engine cover.
3. Filled the gas tank hold with foam from old camper cushions.
4. Covered any surface in the muffler box that had a tinny sound when knocked on with a butyl mat and then a layer of 10mm sound mat with foil face. Then added a few acustic squares.
5. Covered inside fiberglass of seat areas that face the inward with butyl mat and 10mm sound mat.
6. Added foam floor covering from SBT.
Things I still plan to do.
1. Fill aft under seat storage areas with large foam blocks when I figure out where to source them. The kind used at kid parks.
2. Feel like that though the sound mat will keep noise from coming though a panel the aluminium foil side does nothing to attenuate the sound waves in the engine bay. Once I source the right foam egg crate type material I plan to cover all walls in the engine bay with it. I added acustic squares but really think all walls should be covered.
3. Feel like a lot of sound comes from the swim deck as mentioned in other threads. The aft end of the swim deck is a large cavity and when you rap your knuckles on the aft top deck it resonates all through the muffler box. Other than the hold down loops on the transom there is nothing else in there. Why not fill that area with expandable foam? If god forbid you had to get to the hold down bolts you could always carve out the foam. Any options?
At this point I don't really sense sound coming from the forward hull but will not rule it out either. Even at the current level the boat is much more enjoyable, most importantly wife and kids don't notice a noise issue anymore.
