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Engine Box Insulation

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  • ualgrizz
    replied
    The insulation on my 91 Pro Star is on the inside. It was no more than .5 inch thick foam. Over the years it has deteriorated to a point where I needed to completely rip it out. I think most of the earlier MCs that have a dog house are insulated on the inside.

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  • Spitfire
    replied
    I have a question. On my ‘85, the inside of the doghouse is hard plastic; I assume the doghouse is insulated, but that the insulation is outside of the interior shell.

    On the ‘95 Brendella I looked at (prior to buying the MC), the interior of the doghouse was covered with aluminized insulation material of some type (I assume what the OP here is searching for).

    Did MC change their engine insulation to a mat lining the inside of the doghouse, or does my ‘85 simply not have any?

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  • ualgrizz
    replied
    Hey Guys:

    I'm going to use Fat Mat to insulate my 91 ProStar Dog House. Anyone by chance know the square footage...I'm not at home to measure? What Mil size did you recommend?

    Thanks, Grizz

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  • paintpollz
    replied
    Originally posted by agua4fun View Post

    I can plot the measurments with other settings if it helps...
    I read your graphs and they made sense to me. By the way thank you for posting, this was very useful information. After I inhaled a gallon of acetone and spent 8 hours working old adhesive off of the engine box, I lost all motivation to see the project thru. I put the engine box back on and noticed no difference in sound with the old insulation removed, so I just threw in the towel on the project.

    I'd rather spend the $$$ on 4 handles of Titos.

    Leave a comment:


  • agua4fun
    replied
    The 5692T52 is listed as 60% reduction. I am curious how they came up with that number.
    I'd go for something more specifically for sound attenuation if I was doing it again.
    It is a noticeable reduction at idle. Just not impressive (at least for me)
    That being said, i'm happy with the reasonable improvement and clean looks.

    I can plot the measurments with other settings if it helps...

    Leave a comment:


  • Roman
    replied
    Om nm, i figured out how to read the graphs.

    Can you filter the noise out of the results somehow so the lines are smoother? Im trying to understand how much reduction in db you are seeing in gear at idle and at 3k.

    Idle looks to be a good reduction in noise, like around 5-10 db if I try to visually filter the data.
    3k looks to be around like a 3-5db reduction?

    Im about to do this but I am going to get the mcmaster one that says 75% reduction in noise. I assume yours is the 50% reduction one.

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  • paintpollz
    replied
    wow. not worth it

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  • agua4fun
    replied
    Since Acoustical Engineering is part of my job, I had to test my before/after results with the engine box insulation upgrade. - Maybe it's too much info, but I had to do it.
    I used McMaster 5692T52 foil insulation (I ordered 8' and used all of it). It wasn't the highest rated for sound absorption, but I liked the look of the foil when complete. I also like the idea that if the foam starts to fail like the old stuff, It will stay off the engine for a while longer.

    2001 PS190 Sammy 330 LTR

    The key on each image is in the top right
    The 'Before' measurements don't say before, and are with no insulation. (after I removed the old nasty stuff)
    The 'After' measurements are noted as 'after'
    Off = engine off, just a baseline
    Idle = engine is idling in open water.
    Gear= engine is in gear but at idle speed
    1k= 1000 rpm
    3k= 3000 rpm
    4k=4000 rpm (more wind noise than anything)

    I tried to maintain the same testing conditions before and after insulation.
    80-85 degrees, low humidity, less than 5mph wind, same people on board, boat warmed up etc.. Testing was with a certified calibrated test microphone and software.

    Overall, I would say it took the edge off the noise, but wasn't as much of a change as I would hope.
    Attached Files

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  • petemay121
    replied
    I just did mine also on a 2001 ProStar 190 - got it off Amazon, I sanded the inside and cleaned it - it stuck very well. Will see how it holds up this summer.
    Attached Files

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  • bret
    replied
    Gotta pic? I had to move my engine box forward about an 1/8" to keep mine from hitting my PP. There was enough play in the screws that hold the back floor plate to move it just enough to not hit anymore. I used the Cool It Thermo Tec, bit thinner than the foam.

    Leave a comment:


  • paintpollz
    replied
    Originally posted by Coach Mike View Post
    Been running for a couple weeks and I'm very happy with the level of noise reduction we got with the 3/4" foil faced insulation from Fatmat. The tape really makes it all look great and seamless too. Glad we did it too.
    Mike, do you have perfect pass in your boat? My PP servo hits the engine cover every time I close it, even with the foam removed. That's why I'm hesitant to do this project. I wonder if I can shift the PP servo somehow.....

    Leave a comment:


  • Cody2662
    replied
    Originally posted by mikeg205 View Post
    where do you get the dark foam -


    It is from McMaster- Carr also, p/n 5692T49. I got 8’ of it

    https://www.mcmaster.com/mv1524768349/#catalog/5692T49


    Sent from my iPhone using Tapatalk

    Leave a comment:


  • mikeg205
    replied
    Originally posted by Cody2662 View Post
    I got mine done last weekend, it was pretty well fried. It turned out pretty well. I got some dynamite tape for the seems and to hold the cup holders together. It’s a hell of a a lot more quiet now
    where do you get the dark foam -

    Leave a comment:


  • Cody2662
    replied
    I got mine done last weekend, it was pretty well fried. It turned out pretty well. I got some dynamite tape for the seems and to hold the cup holders together. It’s a hell of a a lot more quiet now
    Attached Files

    Leave a comment:


  • fresh36
    replied
    Just replaced my engine hatch insulation on my 05 X9. Didn’t take pictures through the process but wanted topmost the final product. I purchased my material from soundcow.com. Not cheap. Took two sheets that are about 4’ x4’. Won’t know until I put it in the water on whether or not there is a big difference. It is about 1 and 1/4” thick and has a rubber barrier in it as well.

    I removed about 70% of the glue and found that to be the worst part. Tried just about everything and nothing worked great. All of it would tend to loosen the glue up and then it would just move around. Ended up power washing what I could and the cleaned it up.




    Sent from my iPhone using Tapatalk

    Leave a comment:

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