quietning the 4bt
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    Default quietning the 4bt

    obviously most of us know the 4bt is quite a loud engine.
    i want to hear my exaust less so i just thought i would bring up the topic and see what ideas came out.
    looking at the stuff from second skin[previously brought up in another thread] i think i'm going to put some dampening materials around the engine compartment.
    last week my dad was thinking if you could spray foam the sides of the block to quiet it down
    any thoughts everyone
    2003 quad cab dodge Dakota, now rear wheel drive, serious traction issues
    twin turbo 4bt, newly installed 4l80e, VE fuel mods curtesy of cumminsfever
    VE performance Beta tester
    photo's http://picasaweb.google.com/dieseldakota
    build thread http://www.4btswaps.com/forum/showth...ht=2003+dakota

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    Default Quiet 4bt?

    You could try making a cover to go over the valve cover and injector area out of fiberglass, l'm sure covering those 2 areas with a sound deadening material would help alot. Perhaps a cover made of nomex or something non combustible, obviously cut to fit and avoid moving parts.

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    you could also use something like dynamat in the interior. Do the floor, the roof, the doors, everything you can. Makes a big difference. I've used a material similar to dynamat and it works real good. Don't remember what it's called but I get it from the local sterio shop.

    Stephen
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    Don't spay the engine itself,not such a good idea..I used a soundstop foam in the cab of my trucks,and it works REAL WELL,it is originally for the bulkheads,and engine house covers on yachts.I got mine from ebay .It wasn't cheap,but it does work.

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    By sound deadening on the engine your reducing the noise at the source.
    The first place you want to start sound deadening on the engine is any sheetmetal item, especially the oil pan, the side cover where the tappets are, front of the timing cover and the valve covers. Use Second Skin Sprectrum, apply a 2 millmeter coating for maximum sound deadeading. Next you want to coat the entire surface of the engine compartment with sound absorbing material, including underneath the hood. The nice thing about using the spray on material is not having to cut patterns of material, just a little masking and your on your way.

    I've applied the coating to my oilpan and did notice a slight decrease in noise, need to finish the job.
    Last edited by scout4bta; 10-14-2009 at 07:25 PM.
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    On top of the second skin and products like it, I'm planning on installing a valve cover and oil pan blanked from this place.

    I need to get them some measurements for the 4bt. It would be great if others would want a set also. More units means less cost per unit. I would also get the turbo and exhaust blanket, but I think that is conversion specific.

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    what about lining the inside of the valve covers with something like a sort of matting or a spray on somthing, make it quieter and still pleasing to the eye on the outside, or is there to much worry of stuff breaking down and getting into the oil

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    Quote Originally Posted by Strange View Post
    what about lining the inside of the valve covers with something like a sort of matting or a spray on somthing, make it quieter and still pleasing to the eye on the outside, or is there to much worry of stuff breaking down and getting into the oil
    exactly what would happen...hot oil dissolves lots of stuff.contamination would be a guarantee.
    i found that vehicles can be toned down a lot with an engine cover.there on new oem cars for a reason...not just looks.a hood pad goes a long way too.
    currently modding an 86' m-1010 cucv ambulance,with factory 14-bolt/detroit in back and an open 60 in front.lifted 6 inches,running 37's on 17 x 8's.now swappimg in a mild 6bt,and an nvg-4500/np205 combo.hope to have it running by fall.
    link to engine build... http://www.4btswaps.com/forum/showth...n-engine-build...

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    Here's the most economical way to sound deaden the Cummins... The 1st step would be ear plugs, the 2nd step would be ear muffs, combined these two simple steps are very effective. And this technology can be used in many different situations, irritating inlaws for example
    1989 D250 CTD, 727HD, D70/3.07, BHAF, DIY Cold air, Tuned VE, 4" exhaust

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    But......... it's supposed to be noisey.........it was that way when I got here......The best way is to sound insulate the cab,and besides,what would a Harley be if it was real quiet???

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    Quote Originally Posted by 2Dodges View Post
    besides,what would a Harley be if it was real quiet???
    slightly less useless

    3 out of 5 Harley's are still on the road today.....the other two made it home

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    This is how I quiet my 4BT.........



    .............. Turn it off


    Otherwise its just noisey.....
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    i don't mind hearing my exaust roaring when i stand on it i love the truck being load i would just rather have less "engine" noise i can barely even hear my exaust
    2003 quad cab dodge Dakota, now rear wheel drive, serious traction issues
    twin turbo 4bt, newly installed 4l80e, VE fuel mods curtesy of cumminsfever
    VE performance Beta tester
    photo's http://picasaweb.google.com/dieseldakota
    build thread http://www.4btswaps.com/forum/showth...ht=2003+dakota

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