Shhhh! How do I make mt Tige be quiet?

[eric korbas]

I am thinking of putting some sound deadning material or fiberglass in the motor box of my 21i. Has anyone tried this? If so how did it work? I am coming over from an I/O and having trouble getting used to the noise...

[wolfpack]

Dynamat may be a good choice for something like this.

[hanzj]

I was thinking about doing something as well to my 21V. At certain rpms, the air intake whistles.

[jeffro]

be careful on using the dynamat, if it gets hot enough the adhesive may not stay stuck on...

[wakeboarder_37122]

quiet

I thought my 03,21i ,needs something done to quiet.Let me know what works.

[eric korbas]

I don't think DynaMat will work, Dynamat is meant for metal vibration, works great in a car, but not so great in a big floating chunck of fiberglass and this is just motor/exhaust noise I'm trying to cut down. I went to West Marine and found some foil and foam insulation, but It is way expensive, like $70 for a small sheet! It would take at least 2 or 3 to insulate the motor box and shaft cover, but it definately looks like good stuff. I think the best adheasive would be 3m trim adheasive, it's specialy made to handle heat, then back it up with staples or screws. The only thing I'm worried about is clearences inside the motor box, this stuff is like 1 1/2" thick.

[Domsz06]

go buy that foam in a can stuff. Put it on the inside of your motor box and I'm sure that will help, or use spray in bedliner. That would stick and help as well. I have my 03 and don't think it's that loud, I mean it could be a bit quiter, but didn't notice that much. Let me know what you decide and I might do the same.

Dom

[wolfpack]

Here's a better solution, get a louder stereo.

[wakeboarder_37122]

noise

Yea ear plugs would help too.I had an io one time and I insulited the dog house with some silver insulation.I beleive it had a dimond shape stamp design on it.I think I got it at Home Depot.

[bfrank]

Why would you want to quiet it??? Loud pipes save lives!!! My old boat had a fiberglass swim platfrom that really dampened the sound, now with my new boat and the teak platform, I love open her up to hear the rumble, I really wish it was louder!!!!!

[wakeboarder_37122]

quite

I don't think we are talking rumble here,at least in my 03,21i.there is no exhaust sound.Not like my old supra comp. with straight pipes.I would like to hear some rumble from my Tige.All I hear is engine and drive train noise,that is what I would like to quiet down.

[Paublo]

I once had a Sea Ray that had the motor enclosure lined with the foil backed foam sheeting material. It was so quiet that at idle you would not know if the engine was on if someone was talking. The same material is used to quiet noisey air conditioning systems on some large commercial buildings. It works good on mid to high frequency noise, just not good for low frequency. Let us know what you try and how it works.

[eric korbas]

Got the insulation, found it at pepboys for only $20 bucks for more than enough for the motor box, it's not a thick as the stuff a west marine but I think it will do the trick and way less expensive. I've got a soundlevel meter from work, I'm going to try to install this weekend and I'll let you know the results.

[eric korbas]

Wanted to give all an update...
I installed the sound dampening material in the shaft cover this weekend, it didn't take long just had to wait for the glue to set, Not much of an improvement. At the driver seat saw little to no reduction, however at the rear seat saw about a 3-4 dB reduction at crusing speed. Not alot, but I hope for more out of the motor box, it's a little tuff cutting the insulation just the right shape. In doing some measurements around the boat found that alot of the noise was coming from the upolstered side covers, so after I hit the motorbox will have to try there too... Besides the weather was too pretty to stay inside so doing the motor box had to wait...Almost hit 95 degrees! There is nothing better than a lazy day on the lake, can't wait till summer! Althought the water was like 66 degrees!

[Ruune]

regarding whether or not dynamat would work...
Even though it is normally used on metal surfaces, metal vibration (even if that were the case, as it reduces road noise while keeping interior sound from passing through) as a source of noise is irrelevant. Basically, Dynamat is a name-branded version a sound absorption material called "Mastic" (aka "hi temp" mastic with the foil on each side). What this sound deadening material does is convert sonic energy (sound waves) into heat. Yes, heat. Sounds odd, and I'm not going to get into energy phase changes, but it does happen.

In other words, unless the deadening material is designed for a much different frequency of sound, it'll work. Just make sure the glue sticks!

you might want to try covering the inside of your engine cover with the sound deadening material that you're using.