Decibels
When you use mufflers,what is their impact on the engine noise level?Have you any stats?Is it possible to stay under 90 decibels?
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Silent choice knocks my WOT about 10 knots. I am curious to know what Silent Thunder does. Not very scientific but My Formula 382 w/ 500HP Blue motors does 74 by GPS on flat water. Mine is a 99 with stepped hull. Anyone with a comparable Silent Choice Boat?
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Warning!!!! If you have Merc Blue Motors, especially 525's, do not run your diverters over 1500rpm let alone WOT. Reversion is usually the result. And even though Corsa and other companies say you can run up to 3000 or 3500 rpm, don't do it with a 525 or probably even a 500. Someone here lost 2 new 525's because of a miscommunication about this very issue. Get external mufflers if you have to quiet it down. Getting under 90 can be done though. I think CMI makes some that can get down to that level. There are others out there though. It really depends on what motor(s) you have and how loud they are to begin with.
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Originally Posted by UNSANE
(Post 2516746)
Warning!!!! If you have Merc Blue Motors, especially 525's, do not run your diverters over 1500rpm let alone WOT. Reversion is usually the result. And even though Corsa and other companies say you can run up to 3000 or 3500 rpm, don't do it with a 525 or probably even a 500. Someone here lost 2 new 525's because of a miscommunication about this very issue. Get external mufflers if you have to quiet it down. Getting under 90 can be done though. I think CMI makes some that can get down to that level. There are others out there though. It really depends on what motor(s) you have and how loud they are to begin with.
But I could be wrong! |
It happened on the sea trial. The former owner was driving the boat and we were puzzling over why we were going so slow. Pardon my ignorance but what is reversion?
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Originally Posted by rjr
(Post 2516895)
It happened on the sea trial. The former owner was driving the boat and we were puzzling over why we were going so slow. Pardon my ignorance but what is reversion?
Reversion can also happen with leaky headers and water can get back into the cylinder while running or even sitting after running. (why I drain my headers every time) |
Thanks for the tip. My motors are 500's but it sounds like a problem for any motor
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