Sound Reduction

[Archive]

Well, in an effort to make the old truck a little more enjoyable to drive on long trips, I pulled the interior, all but the headliner and dash, and installed 1/2" rubber on the floor and 3/8" rubber mat on the outer door skin and the rear quad cab panels. Also glued 1/2" rubber belting to the area below the back glass. As has been reported in the past, the back of the cab is bare metal, and any effort at insulating for sound control has a significant return.

I invested about 10 hours on this project and can say that overall it was worth the time. However, I was disappointed in the reduction of engine noise. I think that my next efforts will include laminating sheet lead and rubber sheeting to make a damping material that I'll install on the transmission tunnel from the underside of the truck in my efforts to quiten the mighty Cummins, at least from the driver seat.

As a side note, after adding all the extra rubber, you can't hear the exhaust at all. And that's without a muffler or cat. That is with the windows up, to hear the good sounds, all I've gott'a do is lower the passenger side window.

------------------
"95" 3500, 4WHD, Ext cab. SLT, 5 spd, 4. 10 LSD, Rancho 9000's PacBrake, running boards, Mopar mud flaps, Isspro EGT, 50lb. boost, TST #8, 215HP injectors,no cat, muff or turbo ring.

[This message has been edited by moparguy (edited 09-24-2000). ]

 

[Archive]

Without padding that firewall, you will always here that kitten purr..... I was amazed at how much engine noise even those rubber boots stop (in the firewall - for wires). I mistakenly left one off (the one that covers where a clutch would go through) and was surprised how much louder it was in the cab... .

 

[Archive]

Anyone have suggestions on where to buy sheet lead? I'm not having any luck locally.

Thanks, RR

 

[Archive]

any marine dealers in your area? I have seen material sold at boat places looks like combination rubber and tin foil? supposed to be heat, water and whateverelse resistant, sold to quitet marine engine noise. just a thought.

------------------
1999 3500 quad cab, auto aero fendor trim and running boards,
bugflector II, K&N filter, Geno's monster tip

 

[Archive]

There was a post in the past the said that a lot of the engine noise is from resonance in the header pipe. Replaceing a section of the pipe with flex like used on big rigs is supposed to reduce this noise. Has anyone tried that?

------------------
Joe George
Eureka, CA

'95 2500 CC auto 4X4,3. 54,Combo EGT/boost guage,custom switch panel,PacBrake,TST #5,BD valve body,Automatic motorhome steps on both sides,Foldacover hard bed cover,Cummins chrome kit,Black steel grill guard,Front hitch receiver

 

[Archive]

Dynamic Control, Inc. (Dynamat) sells a product called Dynaliner Max which is comprised of: a bottom layer of 1/8" neoprene foam, 15 mils of acoustic lead, 1/4" of high efficiency open/closed cell foam, and a 3 mil urethane top facing. This is about 7/16" thick.
www.dynamat.com/dlmax.htm (Dynaliner Max)
www.dynamat.com (home)

[This message has been edited by John (edited 09-26-2000). ]

 

[Archive]

if you don't like the noise, they make a special type of vehicle just for you -- a GASSER.