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Sportjet noise
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ryandh



Joined: 24 May 2013
Posts: 23
Location: Grande Prairie

PostPosted: Thu Jul 04, 2013 12:08 am    Post subject: Sportjet noise Reply with quote

Has anyone had any success cutting down the noise of a sport jet in the boat?
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shallow draft



Joined: 15 Jun 2005
Posts: 134
Location: Rocky Mountain House

PostPosted: Thu Jul 04, 2013 10:26 am    Post subject: Reply with quote

Line the engine compartment with some sound absorbing material.
Carpet the hull from the floor up.
Add a piece of rubber to the swim platform.
This piece of rubber dampen the resonance and make an incredible difference.
I got mine quiet enough to actuality talk.

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ryandh



Joined: 24 May 2013
Posts: 23
Location: Grande Prairie

PostPosted: Thu Jul 04, 2013 8:20 pm    Post subject: Noise Reply with quote

Thanks. I ordered some soundproofing material to do the engine bay and I'm trying to source some marine carpet. The rubber mat is interesting. What did you use and how did you fasten it?
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shallow draft



Joined: 15 Jun 2005
Posts: 134
Location: Rocky Mountain House

PostPosted: Thu Jul 04, 2013 8:38 pm    Post subject: Reply with quote

You don't fasten it. I used some rubber that is about 1/4 thick.
just cut 2 holes in it and take bar off the and stomp put it
on the 2 uprights. Replace the bar and the rubber mat stays put and absorbs the vibrations.

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shallow draft



Joined: 15 Jun 2005
Posts: 134
Location: Rocky Mountain House

PostPosted: Thu Jul 04, 2013 8:44 pm    Post subject: Reply with quote

The rubber mat is about 14x20. It fits nicely between the swim platform supports
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ryandh



Joined: 24 May 2013
Posts: 23
Location: Grande Prairie

PostPosted: Thu Jul 04, 2013 8:58 pm    Post subject: Reply with quote

What kind of boat are you running?
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shallow draft



Joined: 15 Jun 2005
Posts: 134
Location: Rocky Mountain House

PostPosted: Thu Jul 04, 2013 9:03 pm    Post subject: Reply with quote

Outlaw 16 ft 240 SJ. Like a Lynx but a 12 degree bottom
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mxracer68



Joined: 19 Jun 2006
Posts: 38

PostPosted: Fri Jul 05, 2013 11:42 am    Post subject: Reply with quote

All of the stuff above helps, also here are few more things:

- Put a rubber sleeve (I just used electrical tape) around your EZ Clean springs to dampen vibration

- I didn't do this when I had my Lynx but it was next. Remove the muffler boxes off the back of the hull and pipe external mufflers out to the edge of your swim grid. It lessens echo under the swim grid I've been told. Hang the mufflers from the swim grid with rubber mounts.

- block all noise travel paths from your engine compartment. Mine had a rear deck that I blocked with styrofoam or even rags to make sure the engine compartment was isolated from the cabin.

- Pull your floor and put weather stripping or something similar on the tops of the stringers

- I had an insulating blanket draped over my engine as well as insulation throughout the engine compartment

- Before you carpet the sides lay some of the dampening sheets used to deaden vehicle panels for big stereo installs. I got mine at Audio Concepts in Grande Prairie. They are adhesive on one side.

I can't tell you what works and what doesn't but any sound deadening medium or blocked path from your engine compartment will help. I relentlessly tried things and whether I mentally convinced myself it worked or not I thought it was better than when I first got the boat.

Best of luck!
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shallow draft



Joined: 15 Jun 2005
Posts: 134
Location: Rocky Mountain House

PostPosted: Fri Jul 05, 2013 1:06 pm    Post subject: Reply with quote

I forgot that I had blocked the path from the engine compartment. I also forgot that I wrapped the springs. I used a sound level meter. Every little bit helps. When I got to the point it was tolerable I quit doing more. I think with even more time and experimenting even better results can be achieved.
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shallowman



Joined: 03 Apr 2006
Posts: 199

PostPosted: Fri Jul 05, 2013 10:07 pm    Post subject: noise Reply with quote

I worked on them motors for many hours and the loudest noise came from underneath,
check under the boat and make sure that the intake is not touching the hull as it will transfer noise like crazy , i removed about a 1/4 inche all around that steel horseshoe , so it does not touch , u will be amazed

good luck Smile
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ryandh



Joined: 24 May 2013
Posts: 23
Location: Grande Prairie

PostPosted: Fri Jul 05, 2013 10:33 pm    Post subject: Reply with quote

Great ideas guys. The product I got for the engine bay is from dei http://www.designengineering.com/category/catalog/boom-mat-acoustical-products/under-hood-thermal-acoustic-lining
I'm going to try carpeting the sides without the soundproofing underneath. I have found a lot of those materials to be really heavy. Definitely going to do a Mat on the swim grid and I might try a piece of rubber hose around the springs. My boat is a 16' lynx with a 240. Mufflers are in the sides of the engine bay and exit out the back of the hull. Has anyone tried different baffling? Plan on wrapping them with exhaust wrap. I had the clean out apart when I did the pump this spring and I put a strip of foam weatherstrip around the outside edge before I re-installed it, I will look at the clearances though.
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ryandh



Joined: 24 May 2013
Posts: 23
Location: Grande Prairie

PostPosted: Fri Jul 05, 2013 10:49 pm    Post subject: Reply with quote

Other suggestions I've had are baffles under the floor to stop the noise from carrying forward below the floor and echoing up the front. ( he used hanging pieces of carpet to block the noise but not any possible water.) and a curtain under the dash to block more of the noise.
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mountainman



Joined: 15 Jan 2006
Posts: 131
Location: Grande Prairie, Alberta

PostPosted: Thu Aug 08, 2013 6:24 pm    Post subject: Reply with quote

Has anyone tried moving the blower exhaust from the top to the back of the boat? I'm sure that is why there is so much noise especially if the top is up. I think that'll be my next move. I lined the swim deck with rubber and put weather stripping on the dog house. I'll be closing the compartments from the back also to cut down the noise from there too.
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WILSON



Joined: 17 Jun 2005
Posts: 352
Location: Mexico City

PostPosted: Fri Aug 09, 2013 5:58 pm    Post subject: Reply with quote

Pump up the stereo volume...
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mountainman



Joined: 15 Jan 2006
Posts: 131
Location: Grande Prairie, Alberta

PostPosted: Sat Aug 10, 2013 1:38 pm    Post subject: Reply with quote

WILSON wrote:
Pump up the stereo volume...

I wish it was that easy.....
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