Anyone used sound deadening matt in their cowling?

[Mr. Demeanor]

The cheap foam insulation in my Opti's cowling is coming loose in a few places. I was thinking of replacing it with something like dynamat sound insulation if it would knock the noise down significantly. Has anyone tried this and what adhesive did you use. I was thinking 3M Super 90. The current foam is 1/2"
I know...why would I want it quiter :confused: Its just a fishing boat and when the wife is happy...so is the Captain :cheers:

[Hottrucks]

I'm in to see what works??

[Mr. Demeanor]

I sent an email to tech spport at Dynamat and will post what they respond with.

[flabum1017]

I did..... came out good:

http://c4.ac-images.myspacecdn.com/images02/33/l_72a19d91573b4820b6db909df768cd23.jpg

Very heavy though, used contact cement

[ssv1761982]

I did that to a 2.0 clamshell. It helped but not as much as we expected.

[Mr. Demeanor]

Just got this response from Dynamat:



"Thank you for your interest in Dynamat. For your situation, we would recommend a two product solution. First, apply Dynamat Xtreme to the inside of the engine cover, over Dynamat apply our ½” thick Dynaliner. The combination will deliver superior results to the OEM configuration. Please let us know if you have any additional questions.

Best regards,

Technical Department

Dynamic Control of North America, Inc.

http://www.dynamat.com

513-860-5094 Phone

513-860-5095 Facsimile"


This combination is 7/16" thick or 1/16" thicker than the stock 1/2" foam. What products did you guys use.

[flabum1017]

7/16 ia smaller than 1/2

[Mr. Demeanor]

Dooooh...

1/2" + 1/16" = 9/16"

So, I was on the boat today and put my ear to the cowl and not much noise really comes from the cowl. Most seems to come from the exhaust so I do not know if this will accomplish anything. I may see if a local stereo shop has some scraps if I am goinf to replace the foam anyway.

[flabum1017]

This combination is 7/16" thick or 1/16" thicker than the stock 1/2" foam. .




Be careful of what you use, make sure it is fire retardant. Xome of the stuff the stereo shops use is not.

The stuff I used is designed for engine compartments, you can get it at West Marine.

[Mr. Demeanor]

I would use the stuff that dynmat recommended. It is heat rated for the engine compartment.

[Magcat 62]

SUMITT or jegs sells a foam- foil material used for engine compartments floor pans ect works good ART WHEN the power head is quiet your senses to power output seem sharpened thats what i found being in the cockpit.

[dwiggl]

When I upgraded from the old Tower of Power to the clamshell V-6 the wife said it sounded like a 'jet boat" Well that was quite the insult..... Put some horns on the air box and Dynamat. Major difference. 7 yrs later the mat is still tight on the inside of the cowling. Used the non-foil backed stuff designed for under the engine bonnet. Wife still boats with me & sleeps with me. And once again,want I to add another 100HP to the boat.....She prolly wants me to add a few inches....

[olboatman]

Dooooh...

1/2" + 1/16" = 9/16"

So, I was on the boat today and put my ear to the cowl and not much noise really comes from the cowl. Most seems to come from the exhaust so I do not know if this will accomplish anything. I may see if a local stereo shop has some scraps if I am goinf to replace the foam anyway.

If your goin to the stereo shop anyway...ya might as will pick up a "head knocker" stereo system so ya won't care what the damn moto sounds like cause ya won't hear it!!!:eek::p:D Gary

[FMP]

It has to stay in place and I always thought it might hold in extra heat?

[Mr. Demeanor]

Post is from 2008 LOL

[olboatman]

Post is from 2008 LOL

Chris....Just shows our "Tunnel Vision"!!!! LOL:eek::o Gary

[Chaz]

Post is from 2008 LOL

Welp then .. How did the 1/2" + 1/16" = 1/8 less than 9/16" , 14mm mat work out .. :D

[home made tunnel]

Prior to painting my cowl - I just lined it with Truck rhino liner (roll-on), and put about 6 coats on. It's probably about an 3/32" thick. Works just fine. The 1/2 dyna foam would most likely work well also.