Engine hatch insulation suggestions

[jon__house]

Well, I've done all I'm going to do to the engine hatch. Fingers crossed it holds up as it was not easy spray and putting the acoustic foam on with the boat on the water and the hatch on. I had other things I wanted to do so I didn't have time to take it out for a test run but I will soon. Thank you for all the help!

 

[1BadTundra]

Well, I've done all I'm going to do to the engine hatch. Fingers crossed it holds up as it was not easy spray and putting the acoustic foam on with the boat on the water and the hatch on. I had other things I wanted to do so I didn't have time to take it out for a test run but I will soon. Thank you for all the help!

Nice, you're gonna love it... That makes a big difference

 

[MilesPrower]

Here's an FFT plot (magnitude only) showing before/after results of my 1'' DynaCore installation:



Y-axis = Magnitude in dB
X-axis = Frequency in Hz

The measurements are 5-sec average, and they were recorded — without calibration — on my phone, held next to my head, while running my 255 FSH Sport E on flat water at 5000 RPM, without A, C, or Z–weighting

In addition to the use of an uncalibrated recording device, how the device is held (and even minute movements of the device while being held) will affect the accuracy of the measurements. Therefore, take all this with many grains of salt. And speaking of take, I'd say the one takeaway is that DynaCore is effective at reducing the transmission of acoustic energy within the three octaves of 1–8 kHz.

 

[jon__house]

Nice, you're gonna love it... That makes a big difference

thank you for recommending the acoustic foam. 8k rpms and can have a conversation now.

 

[1BadTundra]

thank you for recommending the acoustic foam. 8k rpms and can have a conversation now.

Yes sir, like you have a new boat now!!

 

[lazergeek]

I already had 80 mil Kilmat under my engine compartent foam which helped a little, but took @1BadTundra recommendaton and added another layer of acustic foam on top of the factory foam and Noticed a huge diffirence the last time I was out. Today I added Kilmat and foam to the 2 hatches on the sides of my enngine since the sound extends to those areas too. Also added another layer of acustic foam the existing foam on the front side of those compartments. Hopfully the wind and swell will die down soon so I can actually to out and test.

 

[Jerlane]

What foam did you use?

 

[lazergeek]

What foam did you use?

Same as @1BadTundra https://www.amazon.com/gp/product/B0CQX9P42Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

 

[lazergeek]

I already had 80 mil Kilmat under my engine compartent foam which helped a little, but took @1BadTundra recommendaton and added another layer of acustic foam on top of the factory foam and Noticed a huge diffirence the last time I was out. Today I added Kilmat and foam to the 2 hatches on the sides of my enngine since the sound extends to those areas too. Also added another layer of acustic foam the existing foam on the front side of those compartments. Hopfully the wind and swell will die down soon so I can actually to out and test.

Finally was able to take the boat out today, Froze my ass off with the north wind, boating when the temp is in the high 60's is tough, LOL. Anyway, Adding the extra insulation to the side compartmetns was a huge diffrence. The engines were quiter then the wind noise.

 

[Coult45]

I already had 80 mil Kilmat under my engine compartent foam which helped a little, but took @1BadTundra recommendaton and added another layer of acustic foam on top of the factory foam and Noticed a huge diffirence the last time I was out. Today I added Kilmat and foam to the 2 hatches on the sides of my enngine since the sound extends to those areas too. Also added another layer of acustic foam the existing foam on the front side of those compartments. Hopfully the wind and swell will die down soon so I can actually to out and test.

Great to hear how well that all worked. Last winter, i put in a ton of Amazon's version of kilmat, and the result was very noticeable. Putting it in the side compartments too definitely makes a difference. This spring, i'm going to add more, and I'm going to put in the acoustic foam you used as well. Did you put any on the engine bay hatch? If so, how did that turn out and what adhesive did you use?

 

[lazergeek]

Great to hear how well that all worked. Last winter, i put in a ton of Amazon's version of kilmat, and the result was very noticeable. Putting it in the side compartments too definitely makes a difference. This spring, i'm going to add more, and I'm going to put in the acoustic foam you used as well. Did you put any on the engine bay hatch? If so, how did that turn out and what adhesive did you use?

I did add foam to the engine bay back wall and side walls (at least were I where I could get some without covering or moving cables, hoses, labels etc.) Also added a 2nd layer of foam over the existing foam on the forward side of the engine bay and side storage areas I also put some where I could in the rear bilge area were the cleanouts are located.

 

[FSH 210 Sport]

Great to “hear “how well that all worked. Last winter, i put in a ton of Amazon's version of kilmat, and the result was very noticeable. Putting it in the side compartments too definitely makes a difference. This spring, i'm going to add more, and I'm going to put in the acoustic foam you used as well. Did you put any on the engine bay hatch? If so, how did that turn out and what adhesive did you use?

I see what you did there!

 

[FSH 210 Sport]

Finally was able to take the boat out today, Froze my ass off with the north wind, boating when the temp is in the high 60's is tough, LOL. Anyway, Adding the extra insulation to the side compartmetns was a huge diffrence. The engines were quiter then the wind noise.

Well done on the sound insulation! Thanks for braving the Arctic conditions to get a test in before it became truly abominable!

It is good to see adding that material tho the aft compartments and the aft bilge helped. I was thinking of making some removable panels with sound damping material that could be put in under the engines as well.

How is the sound reduction at idle / trolling speed? When I’m fishing for salmon I spend a lot of time with the engines either at idle or no wake 1-2 (depending on conditions), sure would be nice to knock that sound level way down.

Sound insulation is definitely on the upper end of the to do list… wish I’d have remembered to check sound levels with my friends DB meter earlier this year for a before and after comparison.

Did you use 3M 77 or 90 to glue it in?

 

[lazergeek]

Well done on the sound insulation! Thanks for braving the Arctic conditions to get a test in before it became truly abominable!

It is good to see adding that material tho the aft compartments and the aft bilge helped. I was thinking of making some removable panels with sound damping material that could be put in under the engines as well.

How is the sound reduction at idle / trolling speed? When I’m fishing for salmon I spend a lot of time with the engines either at idle or no wake 1-2 (depending on conditions), sure would be nice to knock that sound level way down.

Sound insulation is definitely on the upper end of the to do list… wish I’d have remembered to check sound levels with my friends DB meter earlier this year for a before and after comparison.

Did you use 3M 77 or 90 to glue it in?

It did help a little at idle but was more noticeable impact cruising speed. I used 3M 90, applied to both surfaces then sticking together.