dogon dory
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Are Suzuki 50 HP Motors Unusually Loud?
- Thread starter Bill Bennett
- Start date
dogon dory
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Sorry, Folks - Post Deleted By Author
Well; it took longer to do my haying than expected and I started later than I had planned. I just finished it yesterday (Saturday). I managed to catch my tractor on fire (where is DaveS when you need him). No real damage except to the wiring and the ends of my fingers putting it out.
As I said in the post, six above here, I would test the Quitecar paint on my Honda outboard. I bought a sound meter and measured the decibels in my boat for a reference point.
Some things I found out in my initial test.
Taking a reading from between the seats in the cabin, I get a higher db reading at lower rpm’s when I point the microphone towards the bow than I get with it pointing towards the engine. When the engine rpm is 3500 or higher, the db reading is higher with the microphone pointed towards the engine. I could not run my engine above 4000 rpm because it would kick too much water out from the tank.
I also took readings at 1’ - 3’ - 6’ & 9’ from the engine. 6’ would be between the seats and 9’ would be just inside the v-berth. The readings at 9’ had a db reading as high as those at 1’. The lowest was at 3’ which would be the middle of the deck behind the cabin.
I then painted the inside of my engine cover and ran most test again.
I didn’t get much of a reduction in my readings at any point. The readings ranged from the same to a reduction of 3 db except at 1500 rpm where I actually got a higher reading after applying the paint. The first coat I applied was too thin so that could be the reason for so little of a reduction.
Since the initial test I decided to apply three good coats and retest. It is drying now and I will retest on the 4th. After the test I will report the preliminary results here, then when I get time I will post the readings for all the test
As I said in the post, six above here, I would test the Quitecar paint on my Honda outboard. I bought a sound meter and measured the decibels in my boat for a reference point.
Some things I found out in my initial test.
Taking a reading from between the seats in the cabin, I get a higher db reading at lower rpm’s when I point the microphone towards the bow than I get with it pointing towards the engine. When the engine rpm is 3500 or higher, the db reading is higher with the microphone pointed towards the engine. I could not run my engine above 4000 rpm because it would kick too much water out from the tank.
I also took readings at 1’ - 3’ - 6’ & 9’ from the engine. 6’ would be between the seats and 9’ would be just inside the v-berth. The readings at 9’ had a db reading as high as those at 1’. The lowest was at 3’ which would be the middle of the deck behind the cabin.
I then painted the inside of my engine cover and ran most test again.
I didn’t get much of a reduction in my readings at any point. The readings ranged from the same to a reduction of 3 db except at 1500 rpm where I actually got a higher reading after applying the paint. The first coat I applied was too thin so that could be the reason for so little of a reduction.
Since the initial test I decided to apply three good coats and retest. It is drying now and I will retest on the 4th. After the test I will report the preliminary results here, then when I get time I will post the readings for all the test
dogon dory
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Sorry, Folks - Post Deleted By Author
flrockytop
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Blueback":2fmrc3il said:Has anyone used a db meter to take a reading in the cabin of a 16' C-Dory. My guess is it's about 80-85 dbs at WOT and if thats right, see below for a scale and the expected result.
My goal would be to see a noise level of no more than 70dbs. Remember dbs is a log scale to the power of 10--although our ears are not running on the suggested intensity of the log scale-- we seem to adjust.
85 dbs
Upper limit for any comfort, which is limited. Ear muffs suggested for log exposure
80
1 meter from ringing alarm clock. Conversation is difficult. After a 1-hour exposure, thought is difficult and the stomach contracts.
75
Railroad carriage. Normal conversation not possible. Consensus of experts is that sound levels below 75 dBA "are unlikely to cause permanent hearing damage."
70
Small car at 30 mph; 3 meters from a vacuum cleaner.
Has any one done any more to work on the engine noise on the 16 cruiser? I took a short ride in one last week with the Suzuki engine.
db meter reading at cruise 95db. It was the same pointed at the motor as at the cabin. The fog was so bad that we had to stop the test ride so could not really do much than one quick test.
<db meter reading at cruise 95db. It was the same pointed at the motor as at the cabin. The fog was so bad that we had to stop the test ride so could not really do much than one quick test.>
Was your engine a 2 or 4 stroke? 95 dbs is outrageous for a "pleasure" vessel. As a retired marine engineer I know what 95 dbs sounds like and I would not go in any engine-room over 85 dbs without ear muffs. And even with muffs I would not stay too long. Marine Engineers today stand their watch in sound control rooms with a walk around now and then on the engine platforms. WCB regs. would not allow 95dbs without ear defenders, and the time exposed at this level would be limited too.
Was your engine a 2 or 4 stroke? 95 dbs is outrageous for a "pleasure" vessel. As a retired marine engineer I know what 95 dbs sounds like and I would not go in any engine-room over 85 dbs without ear muffs. And even with muffs I would not stay too long. Marine Engineers today stand their watch in sound control rooms with a walk around now and then on the engine platforms. WCB regs. would not allow 95dbs without ear defenders, and the time exposed at this level would be limited too.
flrockytop
New member
This was a four stroke
No doubt in my mind, they are a bit of a resonance chamber. In the open boats the sound dissipates better, but I doubt that the average four stroke will make that many decibels. I would be surprised at 85. My crews work along freeways and the only time those areas crack 80+ is when someone hits the airbrake nearby. I don't wear ear muffs or other protection, probably never will. Spend some time with a high powered rifle without protection and you won't have to worry about that intensity much anymore.